riscv: Add AST2700 SoC initial platform support

AST2700 SoCs integrates a Ibex 32-bits RISC-V core as the boot MCU
for the first stage bootloader execution, namely SPL.

This patch implements the preliminary base to successfully run SPL
on this RV32-based MCU to the console banner message.

Signed-off-by: Chia-Wei Wang <[email protected]>
Reviewed-by: Leo Yu-Chi Liang <[email protected]>

1 files changed, 92 insertions, 0 deletions

diff --git a/configs/ibex-ast2700_defconfig b/configs/ibex-ast2700_defconfig
new file mode 100644
index 00000000000..22629b90489
--- /dev/null
+++ b/configs/ibex-ast2700_defconfig
@@ -0,0 +1,92 @@
+CONFIG_RISCV=y
+CONFIG_SYS_DCACHE_OFF=y
+# CONFIG_SPL_USE_ARCH_MEMCPY is not set
+# CONFIG_SPL_USE_ARCH_MEMMOVE is not set
+# CONFIG_SPL_USE_ARCH_MEMSET is not set
+CONFIG_TEXT_BASE=0x80000000
+CONFIG_SYS_MALLOC_LEN=0xf00
+CONFIG_SYS_MALLOC_F_LEN=0xf00
+CONFIG_NR_DRAM_BANKS=1
+CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
+CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x14bd7800
+CONFIG_ENV_SIZE=0x20000
+CONFIG_DEFAULT_DEVICE_TREE="ast2700-ibex"
+CONFIG_SPL_TEXT_BASE=0x14bc0080
+CONFIG_DM_RESET=y
+CONFIG_SPL_BSS_START_ADDR=0x14bd7800
+CONFIG_SPL_BSS_MAX_SIZE=0x800
+CONFIG_SPL_SIZE_LIMIT=0x16000
+CONFIG_SPL=y
+CONFIG_SYS_MEM_TOP_HIDE=0x10000000
+CONFIG_SYS_LOAD_ADDR=0x83000000
+CONFIG_BUILD_TARGET=""
+CONFIG_TARGET_ASPEED_AST2700_IBEX=y
+# CONFIG_RISCV_ISA_F is not set
+# CONFIG_RISCV_ISA_A is not set
+# CONFIG_SPL_SMP is not set
+CONFIG_XIP=y
+CONFIG_SPL_XIP=y
+# CONFIG_AVAILABLE_HARTS is not set
+CONFIG_STACK_SIZE_SHIFT=11
+CONFIG_ENV_VARS_UBOOT_CONFIG=y
+# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
+CONFIG_STACK_SIZE=0x100000
+CONFIG_FIT=y
+CONFIG_FIT_SIGNATURE=y
+CONFIG_SPL_LOAD_FIT=y
+CONFIG_SPL_LOAD_FIT_ADDRESS=0x200c0000
+# CONFIG_BOOTSTD is not set
+CONFIG_SYS_BOOTM_LEN=0x4000000
+# CONFIG_ARCH_FIXUP_FDT_MEMORY is not set
+CONFIG_SYS_CBSIZE=256
+CONFIG_SYS_PBSIZE=276
+# CONFIG_CONSOLE_FLUSH_SUPPORT is not set
+# CONFIG_CONSOLE_MUX is not set
+CONFIG_SYS_STDIO_DEREGISTER=y
+CONFIG_BOARD_LATE_INIT=y
+CONFIG_SPL_MAX_SIZE=0x16000
+# CONFIG_SPL_RAW_IMAGE_SUPPORT is not set
+CONFIG_SPL_RAM_SUPPORT=y
+CONFIG_SPL_RAM_DEVICE=y
+# CONFIG_CMD_BOOTD is not set
+# CONFIG_CMD_BOOTI is not set
+# CONFIG_BOOTM_LINUX is not set
+# CONFIG_BOOTM_NETBSD is not set
+# CONFIG_BOOTM_PLAN9 is not set
+# CONFIG_BOOTM_RTEMS is not set
+# CONFIG_BOOTM_VXWORKS is not set
+# CONFIG_CMD_ELF is not set
+# CONFIG_CMD_FDT is not set
+# CONFIG_CMD_IMI is not set
+# CONFIG_CMD_XIMG is not set
+# CONFIG_CMD_SAVEENV is not set
+# CONFIG_CMD_CRC32 is not set
+# CONFIG_CMD_LOADS is not set
+CONFIG_CMD_SYSBOOT=y
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_FS_GENERIC=y
+CONFIG_DEVICE_TREE_INCLUDES="ast2700-u-boot.dtsi"
+# CONFIG_OF_TAG_MIGRATE is not set
+CONFIG_SYS_RELOC_GD_ENV_ADDR=y
+# CONFIG_NET is not set
+CONFIG_SYS_RX_ETH_BUFFER=2
+# CONFIG_DM_DEVICE_REMOVE is not set
+# CONFIG_DM_SEQ_ALIAS is not set
+# CONFIG_BLOCK_CACHE is not set
+# CONFIG_CPU is not set
+# CONFIG_GPIO is not set
+# CONFIG_I2C is not set
+CONFIG_MMC=y
+CONFIG_SUPPORT_EMMC_BOOT=y
+CONFIG_MMC_SDHCI=y
+# CONFIG_MTD is not set
+# CONFIG_POWER is not set
+CONFIG_RAM=y
+CONFIG_SPL_RAM=y
+# CONFIG_RAM_SIFIVE is not set
+CONFIG_SYS_NS16550=y
+CONFIG_SYS_NS16550_MEM32=y
+CONFIG_VIDEO=y
+# CONFIG_VIDEO_LOGO is not set
+# CONFIG_RSA is not set
+# CONFIG_EFI_LOADER is not set