[libcpu]update GPL license to Apache-2.0

53 files changed, 150 insertions, 883 deletions

diff --git a/libcpu/arm/am335x/context_iar.S b/libcpu/arm/am335x/context_iar.S
index c53e15a23a..1266d8cf74 100644
--- a/libcpu/arm/am335x/context_iar.S
+++ b/libcpu/arm/am335x/context_iar.S
@@ -1,21 +1,7 @@
 ;/*
-; * File      : context_iar.S
-; * This file is part of RT-Thread RTOS
-; * COPYRIGHT (C) 2006, RT-Thread Development Team
+; * Copyright (c) 2006-2021, RT-Thread Development Team
 ; *
-; *  This program is free software; you can redistribute it and/or modify
-; *  it under the terms of the GNU General Public License as published by
-; *  the Free Software Foundation; either version 2 of the License, or
-; *  (at your option) any later version.
-; *
-; *  This program is distributed in the hope that it will be useful,
-; *  but WITHOUT ANY WARRANTY; without even the implied warranty of
-; *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-; *  GNU General Public License for more details.
-; *
-; *  You should have received a copy of the GNU General Public License along
-; *  with this program; if not, write to the Free Software Foundation, Inc.,
-; *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+; * SPDX-License-Identifier: Apache-2.0
 ; *
 ; * Change Logs:
 ; * Date           Author       Notes
diff --git a/libcpu/c-sky/ck802/contex_ck802_gcc.S b/libcpu/c-sky/ck802/contex_ck802_gcc.S
index 44f2c331dd..a4431b0f74 100644
--- a/libcpu/c-sky/ck802/contex_ck802_gcc.S
+++ b/libcpu/c-sky/ck802/contex_ck802_gcc.S
@@ -1,21 +1,7 @@
 /*
- * File      : contex_ck802.S
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/c-sky/ck802/core_ck802.c b/libcpu/c-sky/ck802/core_ck802.c
index 047c417267..d8cfce09f7 100644
--- a/libcpu/c-sky/ck802/core_ck802.c
+++ b/libcpu/c-sky/ck802/core_ck802.c
@@ -1,21 +1,7 @@
 /*
- * File      : core_ck802.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/c-sky/ck802/core_ck802.h b/libcpu/c-sky/ck802/core_ck802.h
index 6c335f8178..badae8c0ff 100644
--- a/libcpu/c-sky/ck802/core_ck802.h
+++ b/libcpu/c-sky/ck802/core_ck802.h
@@ -1,21 +1,7 @@
 /*
- * File      : core_ck802.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/c-sky/ck802/stack_ck802.c b/libcpu/c-sky/ck802/stack_ck802.c
index 01fed9ad34..087722072e 100644
--- a/libcpu/c-sky/ck802/stack_ck802.c
+++ b/libcpu/c-sky/ck802/stack_ck802.c
@@ -1,21 +1,7 @@
 /*
- * File      : stack_ck802.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/ia32/interrupt.c b/libcpu/ia32/interrupt.c
index e620cbe76c..82a5aa3791 100644
--- a/libcpu/ia32/interrupt.c
+++ b/libcpu/ia32/interrupt.c
@@ -1,21 +1,7 @@
 /*
- * File      : interrupt.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2015, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/common/mips_addrspace.h b/libcpu/mips/common/mips_addrspace.h
index 3b82a4e371..5a101e1c0c 100644
--- a/libcpu/mips/common/mips_addrspace.h
+++ b/libcpu/mips/common/mips_addrspace.h
@@ -1,25 +1,11 @@
 /*
- * File      : mips_addrspace.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��12��     Urey         the first version
+ * 2016-9-12      Urey         the first version
  */
 
 #ifndef _MIPS_ADDRSPACE_H_
diff --git a/libcpu/mips/common/mips_asm.h b/libcpu/mips/common/mips_asm.h
index 8f97e370ab..949cea9019 100644
--- a/libcpu/mips/common/mips_asm.h
+++ b/libcpu/mips/common/mips_asm.h
@@ -1,25 +1,11 @@
 /*
- * File      : mips_asm.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��7��     Urey         the first version
+ * 2016-9-7       Urey         the first version
  */
 
 #ifndef _MIPS_ASM_H_
diff --git a/libcpu/mips/common/mips_cache.c b/libcpu/mips/common/mips_cache.c
index 1c979b7106..d89a05e8e6 100644
--- a/libcpu/mips/common/mips_cache.c
+++ b/libcpu/mips/common/mips_cache.c
@@ -1,25 +1,11 @@
 /*
- * File      : mips_cache.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��7��     Urey         the first version
+ * 2016-9-7       Urey         the first version
  */
 
 #include <rtthread.h>
diff --git a/libcpu/mips/common/mips_cache.h b/libcpu/mips/common/mips_cache.h
index a947041073..17a728df7e 100644
--- a/libcpu/mips/common/mips_cache.h
+++ b/libcpu/mips/common/mips_cache.h
@@ -1,25 +1,11 @@
 /*
- * File      : mips_cache.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��10��     Urey         the first version
+ * 2016-9-10      Urey         the first version
  */
 
 #ifndef _MIPS_CACHE_H_
diff --git a/libcpu/mips/common/mips_cfg.h b/libcpu/mips/common/mips_cfg.h
index 3f0575d65a..8385ce34c2 100644
--- a/libcpu/mips/common/mips_cfg.h
+++ b/libcpu/mips/common/mips_cfg.h
@@ -1,25 +1,11 @@
 /*
- * File      : mips_cfg.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��10��     Urey         the first version
+ * 2016-9-10      Urey         the first version
  */
 
 #ifndef _MIPS_CFG_H_
diff --git a/libcpu/mips/common/mips_context.h b/libcpu/mips/common/mips_context.h
index 60d573784d..9e23c3864b 100644
--- a/libcpu/mips/common/mips_context.h
+++ b/libcpu/mips/common/mips_context.h
@@ -1,25 +1,11 @@
 /*
- * File      : mips_context_asm.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��7��     Urey         the first version
+ * 2016-9-7       Urey         the first version
  */
 
 #ifndef _MIPS_CONTEXT_ASM_H_
@@ -214,7 +200,7 @@
 	nop
 #endif
 
-	/* ͨ�üĴ��� */
+	/* ͨ通用寄存器 */
 	/* ZERO */
 	lw		$1,  	( 1 * 4)(sp)
 	/* V0   */
diff --git a/libcpu/mips/common/mips_excpt.h b/libcpu/mips/common/mips_excpt.h
index 868b046d3c..4c4362d749 100644
--- a/libcpu/mips/common/mips_excpt.h
+++ b/libcpu/mips/common/mips_excpt.h
@@ -1,25 +1,11 @@
 /*
- * File      : mips_excpt.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��7��     Urey         the first version
+ * 2016-9-7       Urey         the first version
  */
 
 #ifndef _MIPS_EXCPT_H_
diff --git a/libcpu/mips/common/mips_regs.h b/libcpu/mips/common/mips_regs.h
index 7ea07d3869..429de4c5cb 100644
--- a/libcpu/mips/common/mips_regs.h
+++ b/libcpu/mips/common/mips_regs.h
@@ -1,25 +1,11 @@
 /*
- * File      : mips_regs.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��7��     Urey         the first version
+ * 2016-9-7       Urey         the first version
  */
 
 #ifndef _MIPS_REGS_H_
@@ -31,19 +17,19 @@
 
 #define MIPS_REG_NR             32
 typedef struct {
-    rt_uint32_t  regs[MIPS_REG_NR];                             	/*  32 ��ͨ��Ŀ�ļĴ���         */
-    rt_uint32_t  CP0Status;                                        	/*  CP0 Э������״̬�Ĵ���      */
-    rt_uint32_t  CP0DataHI;                                        	/*  ������λ�Ĵ���              */
-    rt_uint32_t  CP0DataLO;                                        	/*  ������λ�Ĵ���              */
-    rt_uint32_t  CP0BadVAddr;                                      	/*  ������ַ�Ĵ���              */
-    rt_uint32_t  CP0Cause;                                         	/*  �����жϻ����쳣�鿴�ļĴ���*/
-    rt_uint32_t  CP0EPC;                                           	/*  ����������Ĵ���			*/
+    rt_uint32_t  regs[MIPS_REG_NR];                             	/*  32 个通用目的寄存器         */
+    rt_uint32_t  CP0Status;                                        	/*  CP0 协处理器状态寄存器      */
+    rt_uint32_t  CP0DataHI;                                        	/*  除数高位寄存器              */
+    rt_uint32_t  CP0DataLO;                                        	/*  除数低位寄存器              */
+    rt_uint32_t  CP0BadVAddr;                                      	/*  出错地址寄存器              */
+    rt_uint32_t  CP0Cause;                                         	/*  产生中断或者异常查看的寄存器*/
+    rt_uint32_t  CP0EPC;                                           	/*  程序计数器寄存器			*/
 } mips_reg_ctx;
 
 #define MIPS_ARG_REG_NR         4
 typedef struct
 {
-	rt_uint32_t  args[MIPS_ARG_REG_NR];                              /*  4 �������Ĵ���              */
+	rt_uint32_t  args[MIPS_ARG_REG_NR];                              /*  4 个参数寄存器              */
 } mips_arg_ctx;
 
 struct linkctx
@@ -85,7 +71,7 @@ struct fp64ctx
 #define MIPS_STK_CTX_WORD_SIZE			38
 #define SZREG			4
 /*********************************************************************************************************
-  MIPS �ļĴ�������
+  MIPS 的寄存器索引
 *********************************************************************************************************/
 #define REG_ZERO                0                                       /*  wired zero                  */
 #define REG_AT                  1                                       /*  assembler temp              */
@@ -1166,3 +1152,4 @@ __BUILD_SET_C0(config,CP0_CONFIG)
 #endif /* !__ASSEMBLY__ */
 
 #endif /* _MIPS_REGS_H_ */
+
diff --git a/libcpu/mips/common/mips_types.h b/libcpu/mips/common/mips_types.h
index 7f0b8a6855..a7dca63eba 100644
--- a/libcpu/mips/common/mips_types.h
+++ b/libcpu/mips/common/mips_types.h
@@ -1,25 +1,11 @@
 /*
- * File      : mips_types.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��7��     Urey         the first version
+ * 2016-9-7       Urey         the first version
  */
 
 #ifndef _MIPS_TYPES_H_
diff --git a/libcpu/mips/x1000/cache.c b/libcpu/mips/x1000/cache.c
index 5fc9682810..003f7c6b53 100644
--- a/libcpu/mips/x1000/cache.c
+++ b/libcpu/mips/x1000/cache.c
@@ -1,21 +1,7 @@
 /*
- * File      : cache.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/x1000/cache.h b/libcpu/mips/x1000/cache.h
index 0454527d91..9614667338 100644
--- a/libcpu/mips/x1000/cache.h
+++ b/libcpu/mips/x1000/cache.h
@@ -1,25 +1,11 @@
 /*
- * File      : cache.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��19��     Urey         the first version
+ * 2016-9-19      Urey         the first version
  */
 
 #ifndef _X1000_CACHE_H_
diff --git a/libcpu/mips/x1000/cpu.c b/libcpu/mips/x1000/cpu.c
index e1a51b9fe7..68f46fad41 100644
--- a/libcpu/mips/x1000/cpu.c
+++ b/libcpu/mips/x1000/cpu.c
@@ -1,25 +1,11 @@
 /*
- * File      : cpu.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��8��     Urey         the first version
+ * 2016-9-8       Urey         the first version
  */
 
 
diff --git a/libcpu/mips/x1000/interrupt.c b/libcpu/mips/x1000/interrupt.c
index 2a7a42e792..ea920facc7 100644
--- a/libcpu/mips/x1000/interrupt.c
+++ b/libcpu/mips/x1000/interrupt.c
@@ -1,21 +1,7 @@
 /*
- * File      : cpu_intc.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/x1000/mips_backtrace.c b/libcpu/mips/x1000/mips_backtrace.c
index b8a861bad5..d83bbe61a7 100644
--- a/libcpu/mips/x1000/mips_backtrace.c
+++ b/libcpu/mips/x1000/mips_backtrace.c
@@ -1,25 +1,11 @@
 /*
- * File      : mips_backtrace.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��11��     Urey         the first version
+ * 2016-9-11      Urey         the first version
  */
 
 #include <rtthread.h>
@@ -30,7 +16,7 @@
 #include "mips.h"
 
 /*********************************************************************************************************
-  ָ���
+  指令定义
 *********************************************************************************************************/
 #define ADDUI_SP_INST           0x27bd0000
 #define SW_RA_INST              0xafbf0000
diff --git a/libcpu/mips/x1000/mips_cache_gcc.S b/libcpu/mips/x1000/mips_cache_gcc.S
index 671f193af0..1e1da4e5e8 100644
--- a/libcpu/mips/x1000/mips_cache_gcc.S
+++ b/libcpu/mips/x1000/mips_cache_gcc.S
@@ -1,25 +1,11 @@
 /*
- * File      : mips_cache_gcc.S
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��19��     Urey         the first version
+ * 2016-9-19      Urey         the first version
  */
 
 #ifndef __ASSEMBLY__
diff --git a/libcpu/mips/x1000/mips_context_gcc.S b/libcpu/mips/x1000/mips_context_gcc.S
index d4c314ab65..d6d2e1631f 100644
--- a/libcpu/mips/x1000/mips_context_gcc.S
+++ b/libcpu/mips/x1000/mips_context_gcc.S
@@ -1,25 +1,11 @@
 /*
- * File      : mips_context_asm.S
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��7��     Urey         the first version
+ * 2016-9-7       Urey         the first version
  */
 
 #ifndef __ASSEMBLY__
diff --git a/libcpu/mips/x1000/mips_excpt.c b/libcpu/mips/x1000/mips_excpt.c
index 5d2a3dce6d..89fca32497 100644
--- a/libcpu/mips/x1000/mips_excpt.c
+++ b/libcpu/mips/x1000/mips_excpt.c
@@ -1,25 +1,11 @@
 /*
- * File      : mips_excpt.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��7��     Urey         the first version
+ * 2016-9-7       Urey         the first version
  */
 
 #include <rtthread.h>
@@ -249,7 +235,7 @@ void mips_exception_handler(mips_reg_ctx *ctx)
 	int 	i;
 	unsigned int epc;
 
-	//��� read_epc_count>0 ˵�� c_except_handler �ڶ� epc ʱ�����ˣ����� epc ������һ���µ��쳣
+	//如果 read_epc_count>0 说明 c_except_handler 在读 epc 时重入了，即读 epc 导致了一个新的异常
 	if (read_epc_count > 0)
 	{
 		printf("ERROR: read epc fail when except handle\n");
diff --git a/libcpu/mips/x1000/mips_excpt_gcc.S b/libcpu/mips/x1000/mips_excpt_gcc.S
index c403adf93b..698f78d20d 100644
--- a/libcpu/mips/x1000/mips_excpt_gcc.S
+++ b/libcpu/mips/x1000/mips_excpt_gcc.S
@@ -1,25 +1,11 @@
 /*
- * File      : mips_excpt_asm.S
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��7��     Urey         the first version
+ * 2016-9-7       Urey         the first version
  */
 
 #ifndef __ASSEMBLY__
@@ -31,7 +17,7 @@
 #define _EXC_STKSIZE 	20*1024
 
 ;/*********************************************************************************************************
-;  PTE BASE ��ض���
+;  PTE BASE 相关定义
 ;*********************************************************************************************************/
 
 #define PTE_BASE_OFFSET                 23
@@ -52,9 +38,9 @@ LEAF(mips_tlb_refill_handlerx)
     ; * K1 = CP0_CTXT
     ; * K0 = K1
     ; */
-    mfc0    k1 , CP0_CONTEXT                                            ;/*  K1 ���� Context �Ĵ���      */
+    mfc0    k1 , CP0_CONTEXT                                            ;/*  K1 等于 Context 寄存器      */
     ehb
-    move    k0 , k1                                                     ;/*  K0 ���� Context �Ĵ���      */
+    move    k0 , k1                                                     ;/*  K0 等于 Context 寄存器      */
 
     ;/*
     ; * K1 <<= PTE_BASE_SIZE
@@ -64,7 +50,7 @@ LEAF(mips_tlb_refill_handlerx)
     ; * K1 <<= 3
     ; */
     sll     k1 , PTE_BASE_SIZE
-    srl     k1 , (PTE_BASE_SIZE + 4 + MIPS32_BADVPN2_SHIFT)             ;/*  K1 Ϊ BAD VPN2              */
+    srl     k1 , (PTE_BASE_SIZE + 4 + MIPS32_BADVPN2_SHIFT)             ;/*  K1 为 BAD VPN2              */
     sll     k1 , (4 - 1)
 
     ;/*
@@ -72,12 +58,12 @@ LEAF(mips_tlb_refill_handlerx)
     ; * K0 <<= PTE_BASE_OFFSET
     ; */
     srl     k0 , PTE_BASE_OFFSET
-    sll     k0 , PTE_BASE_OFFSET                                        ;/*  K0 Ϊ PTE BASE              */
+    sll     k0 , PTE_BASE_OFFSET                                        ;/*  K0 为 PTE BASE              */
 
     ;/*
     ; * K1 = K1 | K0
     ; */
-    or      k1 , k1 , k0                                                ;/*  �ϳ�                        */
+    or      k1 , k1 , k0                                                ;/*  合成                        */
 
     ;/*
     ; * K0 = *K1
@@ -94,9 +80,9 @@ LEAF(mips_tlb_refill_handlerx)
     mtc0    k1 , CP0_ENTRYLO1                                             ;/*  EntryLo1                    */
     ehb
 
-    tlbwr                                                               ;/*  TLB ����滻                */
+    tlbwr                                                               ;/*  TLB 随机替换                */
 
-    eret                                                                ;/*  �쳣����                    */
+    eret                                                                ;/*  异常返回                    */
 
     .set    pop
 END(mips_tlb_refill_handlerx)
diff --git a/libcpu/mips/x1000/mips_fp_gcc.S b/libcpu/mips/x1000/mips_fp_gcc.S
index b219084065..fe71f5deb1 100644
--- a/libcpu/mips/x1000/mips_fp_gcc.S
+++ b/libcpu/mips/x1000/mips_fp_gcc.S
@@ -1,25 +1,11 @@
 /*
- * File      : mips_vfp32_asm.S
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��9��     Urey         the first version
+ * 2016-9-9        Urey         the first version
  */
 
 #ifndef __ASSEMBLY__
diff --git a/libcpu/mips/x1000/stack.c b/libcpu/mips/x1000/stack.c
index 0043ea2a21..5bd9d0fa1f 100644
--- a/libcpu/mips/x1000/stack.c
+++ b/libcpu/mips/x1000/stack.c
@@ -1,25 +1,11 @@
 /*
- * File      : stack.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��8��     Urey         the first version
+ * 2016-9-8       Urey         the first version
  */
 
 #include <rtthread.h>
@@ -59,7 +45,7 @@ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_ad
 		argCtx->args[i] = i;
 	}
 
-	//����ͨ�üĴ���
+	//保存通用寄存器
 	for (i = 0; i < 32; ++i)
 	{
 		regCtx->regs[i] = i;
diff --git a/libcpu/mips/x1000/startup_gcc.S b/libcpu/mips/x1000/startup_gcc.S
index 1376cb7dd4..cab879d2c3 100644
--- a/libcpu/mips/x1000/startup_gcc.S
+++ b/libcpu/mips/x1000/startup_gcc.S
@@ -1,25 +1,11 @@
 /*
- * File      : startup.S
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
- * 2016��9��7��     Urey         the first version
+ * 2016-9-7       Urey         the first version
  */
 
 #ifndef __ASSEMBLY__
@@ -48,7 +34,7 @@ exc_stack_top:
 #define SYSTEM_STACK		0x80003fe8
 
 ;/*********************************************************************************************************
-;  ���
+;  入口
 ;*********************************************************************************************************/
 	.global	rtthread_startup
 	.global 	mips_vfp32_init
@@ -111,7 +97,7 @@ _cache_loop:
 
 
 ;/*********************************************************************************************************
-;  �쳣������
+;  异常向量表
 ;*********************************************************************************************************/
     /* 0x0 - TLB refill handler */
     .section .vectors.1, "ax", %progbits
diff --git a/libcpu/mips/x1000/x1000.h b/libcpu/mips/x1000/x1000.h
index aa18297395..e7849c5751 100644
--- a/libcpu/mips/x1000/x1000.h
+++ b/libcpu/mips/x1000/x1000.h
@@ -1,21 +1,7 @@
 /*
- * File      : x1000.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/x1000/x1000_cpm.h b/libcpu/mips/x1000/x1000_cpm.h
index da2cc964e5..4720158718 100644
--- a/libcpu/mips/x1000/x1000_cpm.h
+++ b/libcpu/mips/x1000/x1000_cpm.h
@@ -1,21 +1,7 @@
 /*
- * File      : x1000_cpm.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/x1000/x1000_intc.h b/libcpu/mips/x1000/x1000_intc.h
index 1644b90777..286232b18a 100644
--- a/libcpu/mips/x1000/x1000_intc.h
+++ b/libcpu/mips/x1000/x1000_intc.h
@@ -1,21 +1,7 @@
 /*
- * File      : x1000_intc.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/x1000/x1000_otg_dwc.h b/libcpu/mips/x1000/x1000_otg_dwc.h
index bb77981daa..7d1cf49c9b 100644
--- a/libcpu/mips/x1000/x1000_otg_dwc.h
+++ b/libcpu/mips/x1000/x1000_otg_dwc.h
@@ -1,21 +1,7 @@
 /*
- * File      : x1000_otg_dwc.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/xburst/cache.c b/libcpu/mips/xburst/cache.c
index cd37f69993..0bdd5e539b 100644
--- a/libcpu/mips/xburst/cache.c
+++ b/libcpu/mips/xburst/cache.c
@@ -1,20 +1,7 @@
 /*
- * File      : cache.c
- * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/xburst/cache.h b/libcpu/mips/xburst/cache.h
index c0f8a1f424..ff3b6dda9b 100644
--- a/libcpu/mips/xburst/cache.h
+++ b/libcpu/mips/xburst/cache.h
@@ -1,20 +1,7 @@
 /*
- * File      : cache.h
- * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/xburst/cpu.c b/libcpu/mips/xburst/cpu.c
index 88137535d9..971f48165e 100644
--- a/libcpu/mips/xburst/cpu.c
+++ b/libcpu/mips/xburst/cpu.c
@@ -1,20 +1,7 @@
 /*
- * File      : cpu.c
- * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/xburst/exception.c b/libcpu/mips/xburst/exception.c
index aebdf704ea..5987ee0172 100644
--- a/libcpu/mips/xburst/exception.c
+++ b/libcpu/mips/xburst/exception.c
@@ -1,20 +1,7 @@
 /*
- * File      : exception.c
- * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/xburst/interrupt.c b/libcpu/mips/xburst/interrupt.c
index 337646c735..0bd393f01f 100644
--- a/libcpu/mips/xburst/interrupt.c
+++ b/libcpu/mips/xburst/interrupt.c
@@ -1,20 +1,7 @@
 /*
- * File      : interrupt.c
- * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * 2010-07-09     Bernard      first version
diff --git a/libcpu/mips/xburst/mipscfg.c b/libcpu/mips/xburst/mipscfg.c
index 1e9b0c032f..33d9e0f94c 100644
--- a/libcpu/mips/xburst/mipscfg.c
+++ b/libcpu/mips/xburst/mipscfg.c
@@ -1,20 +1,7 @@
 /*
- * File      : mipscfg.c
- * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/xburst/stack.c b/libcpu/mips/xburst/stack.c
index ceba8b9d9d..db207f1c2b 100644
--- a/libcpu/mips/xburst/stack.c
+++ b/libcpu/mips/xburst/stack.c
@@ -1,20 +1,7 @@
 /*
- * File      : stack.c
- * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/xburst/stack.h b/libcpu/mips/xburst/stack.h
index 5bb7206c11..ddda88255c 100644
--- a/libcpu/mips/xburst/stack.h
+++ b/libcpu/mips/xburst/stack.h
@@ -1,20 +1,7 @@
 /*
- * File      : stack.h
- * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/mips/xburst/x1000.h b/libcpu/mips/xburst/x1000.h
index 71d11783a3..0d21e14277 100644
--- a/libcpu/mips/xburst/x1000.h
+++ b/libcpu/mips/xburst/x1000.h
@@ -1,21 +1,7 @@
 /*
- * File      : x1000.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2008 - 2012, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
@@ -235,7 +221,7 @@ static inline u32 jz_readl(u32 address)
 #define WDT_TCER_TCEN           (1 << 0)
 
 /*********************************************************************************************************
-**   �ж�Դ
+**   中断源
 *********************************************************************************************************/
 /* INTC (Interrupt Controller) */
 #define INTC_ISR(n)             (INTC_BASE + 0x00 + (n) * 0x20)
diff --git a/libcpu/risc-v/e310/context_gcc.S b/libcpu/risc-v/e310/context_gcc.S
index 7aaa8db432..542092a667 100644
--- a/libcpu/risc-v/e310/context_gcc.S
+++ b/libcpu/risc-v/e310/context_gcc.S
@@ -1,21 +1,7 @@
 ;/*
-; * File      : context_gcc.S
-; * This file is part of RT-Thread RTOS
-; * COPYRIGHT (C) 2018, RT-Thread Development Team
+; * Copyright (c) 2006-2021, RT-Thread Development Team
 ; *
-; *  This program is free software; you can redistribute it and/or modify
-; *  it under the terms of the GNU General Public License as published by
-; *  the Free Software Foundation; either version 2 of the License, or
-; *  (at your option) any later version.
-; *
-; *  This program is distributed in the hope that it will be useful,
-; *  but WITHOUT ANY WARRANTY; without even the implied warranty of
-; *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-; *  GNU General Public License for more details.
-; *
-; *  You should have received a copy of the GNU General Public License along
-; *  with this program; if not, write to the Free Software Foundation, Inc.,
-; *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+; * SPDX-License-Identifier: Apache-2.0
 ; *
 ; * Change Logs:
 ; * Date           Author       Notes
diff --git a/libcpu/risc-v/e310/entry_gcc.S b/libcpu/risc-v/e310/entry_gcc.S
index 83631e67ee..6212cc3fc1 100644
--- a/libcpu/risc-v/e310/entry_gcc.S
+++ b/libcpu/risc-v/e310/entry_gcc.S
@@ -1,21 +1,7 @@
 /*
- * File      : context_gcc.S
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/risc-v/e310/stack.c b/libcpu/risc-v/e310/stack.c
index a68c646e39..ba0fef832c 100644
--- a/libcpu/risc-v/e310/stack.c
+++ b/libcpu/risc-v/e310/stack.c
@@ -1,21 +1,7 @@
 /*
- * File      : stack.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/unicore32/sep6200/context_gcc.S b/libcpu/unicore32/sep6200/context_gcc.S
index 6b958e7f93..9f8e2b8f13 100644
--- a/libcpu/unicore32/sep6200/context_gcc.S
+++ b/libcpu/unicore32/sep6200/context_gcc.S
@@ -1,21 +1,7 @@
 /*
- * File      : context_gcc.S
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/unicore32/sep6200/cpu.c b/libcpu/unicore32/sep6200/cpu.c
index ebea8750e1..01da33ad93 100644
--- a/libcpu/unicore32/sep6200/cpu.c
+++ b/libcpu/unicore32/sep6200/cpu.c
@@ -1,21 +1,7 @@
 /*
- * File      : cpu.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/unicore32/sep6200/interrupt.c b/libcpu/unicore32/sep6200/interrupt.c
index 31078320ea..2737849903 100644
--- a/libcpu/unicore32/sep6200/interrupt.c
+++ b/libcpu/unicore32/sep6200/interrupt.c
@@ -1,21 +1,7 @@
 /*
- * File      : interrupt.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/unicore32/sep6200/sep6200.h b/libcpu/unicore32/sep6200/sep6200.h
index c09823740b..9aced7fbbb 100644
--- a/libcpu/unicore32/sep6200/sep6200.h
+++ b/libcpu/unicore32/sep6200/sep6200.h
@@ -1,21 +1,7 @@
 /*
- * File      : sep6200.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/unicore32/sep6200/serial.c b/libcpu/unicore32/sep6200/serial.c
index 518257b617..9b594d87be 100644
--- a/libcpu/unicore32/sep6200/serial.c
+++ b/libcpu/unicore32/sep6200/serial.c
@@ -1,21 +1,7 @@
 /*
- * File      : serial.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/unicore32/sep6200/serial.h b/libcpu/unicore32/sep6200/serial.h
index e626f5e20f..beeceb6165 100644
--- a/libcpu/unicore32/sep6200/serial.h
+++ b/libcpu/unicore32/sep6200/serial.h
@@ -1,21 +1,7 @@
 /*
- * File      : serial.h
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/unicore32/sep6200/stack.c b/libcpu/unicore32/sep6200/stack.c
index 722f40835e..71b917c214 100644
--- a/libcpu/unicore32/sep6200/stack.c
+++ b/libcpu/unicore32/sep6200/stack.c
@@ -1,21 +1,7 @@
 /*
- * File      : stack.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/unicore32/sep6200/start_gcc.S b/libcpu/unicore32/sep6200/start_gcc.S
index 4dd17aa387..11676e875c 100644
--- a/libcpu/unicore32/sep6200/start_gcc.S
+++ b/libcpu/unicore32/sep6200/start_gcc.S
@@ -1,21 +1,7 @@
 /*
- * File      : start.S
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/unicore32/sep6200/trace.c b/libcpu/unicore32/sep6200/trace.c
index 8f11a18a17..d83447c291 100644
--- a/libcpu/unicore32/sep6200/trace.c
+++ b/libcpu/unicore32/sep6200/trace.c
@@ -1,21 +1,7 @@
 /*
- * File      : trace.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes
diff --git a/libcpu/unicore32/sep6200/trap.c b/libcpu/unicore32/sep6200/trap.c
index 1e5d02a279..b7d564aa57 100644
--- a/libcpu/unicore32/sep6200/trap.c
+++ b/libcpu/unicore32/sep6200/trap.c
@@ -1,21 +1,7 @@
 /*
- * File      : trap.c
- * This file is part of RT-Thread RTOS
- * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Change Logs:
  * Date           Author       Notes