remove IAR toolchain support from make build system

IAR is only supported with CMake. Remove all IAR-specific references
from the Make build system including toolchain files, SRC_S_IAR,
LD_FILE_IAR variables, and IAR toolchain detection.

Also fix GET_SECTOR_COUNT truncation in msc_file_explorer and
broken formatting in stm32f7 board_uart_write.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

27 files changed, 7 insertions, 180 deletions

diff --git a/examples/build_system/make/cpu/arm1176jzf-s.mk b/examples/build_system/make/cpu/arm1176jzf-s.mk
index 022ccf7ad..c0cef8784 100644
--- a/examples/build_system/make/cpu/arm1176jzf-s.mk
+++ b/examples/build_system/make/cpu/arm1176jzf-s.mk
@@ -2,8 +2,4 @@ ifeq ($(TOOLCHAIN),gcc)
   CFLAGS += \
     -mcpu=arm1176jzf-s \
 
-else ifeq ($(TOOLCHAIN),iar)
-	#CFLAGS += --cpu cortex-a53
-	#ASFLAGS += --cpu cortex-a53
-
 endif
diff --git a/examples/build_system/make/cpu/arm926ej-s.mk b/examples/build_system/make/cpu/arm926ej-s.mk
index 5b84f514f..e0558eca7 100644
--- a/examples/build_system/make/cpu/arm926ej-s.mk
+++ b/examples/build_system/make/cpu/arm926ej-s.mk
@@ -2,8 +2,4 @@ ifeq ($(TOOLCHAIN),gcc)
   CFLAGS += \
     -mcpu=arm926ej-s \
 
-else ifeq ($(TOOLCHAIN),iar)
-	#CFLAGS += --cpu cortex-a53
-	#ASFLAGS += --cpu cortex-a53
-
 endif
diff --git a/examples/build_system/make/cpu/cortex-a53.mk b/examples/build_system/make/cpu/cortex-a53.mk
index 42e522ecf..20ed8f0cc 100644
--- a/examples/build_system/make/cpu/cortex-a53.mk
+++ b/examples/build_system/make/cpu/cortex-a53.mk
@@ -2,11 +2,4 @@ ifeq ($(TOOLCHAIN),gcc)
   CFLAGS += \
     -mcpu=cortex-a53 \
 
-else ifeq ($(TOOLCHAIN),iar)
-	CFLAGS += \
-		--cpu cortex-a53 \
-
-	ASFLAGS += \
-		--cpu cortex-a53 \
-
 endif
diff --git a/examples/build_system/make/cpu/cortex-a72.mk b/examples/build_system/make/cpu/cortex-a72.mk
index 1b3d8da4a..b2b3d9181 100644
--- a/examples/build_system/make/cpu/cortex-a72.mk
+++ b/examples/build_system/make/cpu/cortex-a72.mk
@@ -2,11 +2,4 @@ ifeq ($(TOOLCHAIN),gcc)
   CFLAGS += \
     -mcpu=cortex-a72 \
 
-else ifeq ($(TOOLCHAIN),iar)
-	CFLAGS += \
-		--cpu cortex-a72 \
-
-	ASFLAGS += \
-		--cpu cortex-a72 \
-
 endif
diff --git a/examples/build_system/make/cpu/cortex-m0.mk b/examples/build_system/make/cpu/cortex-m0.mk
index c2c33a2ee..1d618982e 100644
--- a/examples/build_system/make/cpu/cortex-m0.mk
+++ b/examples/build_system/make/cpu/cortex-m0.mk
@@ -9,11 +9,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  --target=arm-none-eabi \
 	  -mcpu=cortex-m0 \
 
-else ifeq ($(TOOLCHAIN),iar)
-  # IAR Flags
-  CFLAGS += --cpu cortex-m0
-  ASFLAGS += --cpu cortex-m0
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/cortex-m0plus.mk b/examples/build_system/make/cpu/cortex-m0plus.mk
index fe8feb227..029ce09d1 100644
--- a/examples/build_system/make/cpu/cortex-m0plus.mk
+++ b/examples/build_system/make/cpu/cortex-m0plus.mk
@@ -9,11 +9,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  --target=arm-none-eabi \
 	  -mcpu=cortex-m0plus \
 
-else ifeq ($(TOOLCHAIN),iar)
-  # IAR Flags
-  CFLAGS += --cpu cortex-m0+
-  ASFLAGS += --cpu cortex-m0+
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/cortex-m23.mk b/examples/build_system/make/cpu/cortex-m23.mk
index 7ab758352..b92e24401 100644
--- a/examples/build_system/make/cpu/cortex-m23.mk
+++ b/examples/build_system/make/cpu/cortex-m23.mk
@@ -9,11 +9,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  --target=arm-none-eabi \
 	  -mcpu=cortex-m23 \
 
-else ifeq ($(TOOLCHAIN),iar)
-  # IAR Flags
-  CFLAGS += --cpu cortex-m23
-  ASFLAGS += --cpu cortex-m23
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/cortex-m3.mk b/examples/build_system/make/cpu/cortex-m3.mk
index b6325313f..b58f0203b 100644
--- a/examples/build_system/make/cpu/cortex-m3.mk
+++ b/examples/build_system/make/cpu/cortex-m3.mk
@@ -9,11 +9,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  --target=arm-none-eabi \
 	  -mcpu=cortex-m3 \
 
-else ifeq ($(TOOLCHAIN),iar)
-  # IAR Flags
-  CFLAGS += --cpu cortex-m3
-  ASFLAGS += --cpu cortex-m3
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/cortex-m33-nodsp-nofp.mk b/examples/build_system/make/cpu/cortex-m33-nodsp-nofp.mk
index 405053dd0..858a721fd 100644
--- a/examples/build_system/make/cpu/cortex-m33-nodsp-nofp.mk
+++ b/examples/build_system/make/cpu/cortex-m33-nodsp-nofp.mk
@@ -10,13 +10,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  -mcpu=cortex-m33 \
 	  -mfpu=softvp \
 
-else ifeq ($(TOOLCHAIN),iar)
-  CFLAGS += \
-		--cpu cortex-m33+nodsp \
-
-  ASFLAGS += \
-		--cpu cortex-m33+nodsp \
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/cortex-m33.mk b/examples/build_system/make/cpu/cortex-m33.mk
index 47b0eaecd..5699fef7b 100644
--- a/examples/build_system/make/cpu/cortex-m33.mk
+++ b/examples/build_system/make/cpu/cortex-m33.mk
@@ -11,15 +11,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  -mcpu=cortex-m33 \
 	  -mfpu=fpv5-sp-d16 \
 
-else ifeq ($(TOOLCHAIN),iar)
-  CFLAGS += \
-		--cpu cortex-m33 \
-		--fpu VFPv5-SP \
-
-  ASFLAGS += \
-		--cpu cortex-m33 \
-		--fpu VFPv5-SP \
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/cortex-m4-nofpu.mk b/examples/build_system/make/cpu/cortex-m4-nofpu.mk
index ac2916005..62ab21e31 100644
--- a/examples/build_system/make/cpu/cortex-m4-nofpu.mk
+++ b/examples/build_system/make/cpu/cortex-m4-nofpu.mk
@@ -9,10 +9,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  --target=arm-none-eabi \
 	  -mcpu=cortex-m4
 
-else ifeq ($(TOOLCHAIN),iar)
-  CFLAGS += --cpu cortex-m4 --fpu none
-  ASFLAGS += --cpu cortex-m4 --fpu none
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/cortex-m4.mk b/examples/build_system/make/cpu/cortex-m4.mk
index 57d6e126d..e50fe00ef 100644
--- a/examples/build_system/make/cpu/cortex-m4.mk
+++ b/examples/build_system/make/cpu/cortex-m4.mk
@@ -11,10 +11,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  -mcpu=cortex-m4 \
 	  -mfpu=fpv4-sp-d16 \
 
-else ifeq ($(TOOLCHAIN),iar)
-  CFLAGS += --cpu cortex-m4 --fpu VFPv4-SP
-  ASFLAGS += --cpu cortex-m4 --fpu VFPv4-SP
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/cortex-m55.mk b/examples/build_system/make/cpu/cortex-m55.mk
index de627caed..94cca1a5e 100644
--- a/examples/build_system/make/cpu/cortex-m55.mk
+++ b/examples/build_system/make/cpu/cortex-m55.mk
@@ -12,15 +12,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  -mcpu=cortex-m55 \
 	  -mfpu=fpv5-d16 \
 
-else ifeq ($(TOOLCHAIN),iar)
-  CFLAGS += \
-  	--cpu cortex-m55 \
-  	--fpu VFPv5_D16 \
-
-  ASFLAGS += \
-		--cpu cortex-m55 \
-		--fpu VFPv5_D16 \
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/cortex-m7-fpsp.mk b/examples/build_system/make/cpu/cortex-m7-fpsp.mk
index cd42c6fb8..e79ff6d73 100644
--- a/examples/build_system/make/cpu/cortex-m7-fpsp.mk
+++ b/examples/build_system/make/cpu/cortex-m7-fpsp.mk
@@ -11,15 +11,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  -mcpu=cortex-m7 \
 	  -mfpu=fpv5-sp-d16 \
 
-else ifeq ($(TOOLCHAIN),iar)
-  CFLAGS += \
-  	--cpu cortex-m7 \
-  	--fpu VFPv5_sp \
-
-  ASFLAGS += \
-		--cpu cortex-m7 \
-		--fpu VFPv5_sp \
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/cortex-m7.mk b/examples/build_system/make/cpu/cortex-m7.mk
index 3e6116179..3bd5c1155 100644
--- a/examples/build_system/make/cpu/cortex-m7.mk
+++ b/examples/build_system/make/cpu/cortex-m7.mk
@@ -11,15 +11,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  -mcpu=cortex-m7 \
 	  -mfpu=fpv5-d16 \
 
-else ifeq ($(TOOLCHAIN),iar)
-  CFLAGS += \
-  	--cpu cortex-m7 \
-  	--fpu VFPv5_D16 \
-
-  ASFLAGS += \
-		--cpu cortex-m7 \
-		--fpu VFPv5_D16 \
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/cortex-m85.mk b/examples/build_system/make/cpu/cortex-m85.mk
index 75e8f3aaf..d66e26418 100644
--- a/examples/build_system/make/cpu/cortex-m85.mk
+++ b/examples/build_system/make/cpu/cortex-m85.mk
@@ -11,15 +11,6 @@ else ifeq ($(TOOLCHAIN),clang)
 	  -mcpu=cortex-m85 \
 	  -mfpu=fpv5-d16 \
 
-else ifeq ($(TOOLCHAIN),iar)
-  CFLAGS += \
-  	--cpu cortex-m85 \
-  	--fpu VFPv5_D16 \
-
-  ASFLAGS += \
-		--cpu cortex-m85 \
-		--fpu VFPv5_D16 \
-
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/msp430.mk b/examples/build_system/make/cpu/msp430.mk
index 6daa2c38d..83a35140f 100644
--- a/examples/build_system/make/cpu/msp430.mk
+++ b/examples/build_system/make/cpu/msp430.mk
@@ -2,8 +2,6 @@ ifeq ($(TOOLCHAIN),gcc)
   # nothing to add
 else ifeq ($(TOOLCHAIN),clang)
   # nothing to add
-else ifeq ($(TOOLCHAIN),iar)
-  # nothing to add
 else
   $(error "TOOLCHAIN is not supported")
 endif
diff --git a/examples/build_system/make/cpu/rv32i-ilp32.mk b/examples/build_system/make/cpu/rv32i-ilp32.mk
index af764afc5..6b2306008 100644
--- a/examples/build_system/make/cpu/rv32i-ilp32.mk
+++ b/examples/build_system/make/cpu/rv32i-ilp32.mk
@@ -8,8 +8,6 @@ else ifeq ($(TOOLCHAIN),clang)
     -march=rv32i_zicsr \
     -mabi=ilp32 \
 
-else ifeq ($(TOOLCHAIN),iar)
-  $(error not support)
 endif
 
 # For freeRTOS port source
diff --git a/examples/build_system/make/cpu/rv32imac-ilp32.mk b/examples/build_system/make/cpu/rv32imac-ilp32.mk
index a7b2258d7..e4a3ad24f 100644
--- a/examples/build_system/make/cpu/rv32imac-ilp32.mk
+++ b/examples/build_system/make/cpu/rv32imac-ilp32.mk
@@ -8,9 +8,6 @@ else ifeq ($(TOOLCHAIN),clang)
     -march=rv32imac_zicsr_zifencei \
     -mabi=ilp32 \
 
-else ifeq ($(TOOLCHAIN),iar)
-  $(error not support)
-
 endif
 
 # For freeRTOS port source
diff --git a/examples/build_system/make/toolchain/arm_iar.mk b/examples/build_system/make/toolchain/arm_iar.mk
deleted file mode 100644
index 17967b41a..000000000
--- a/examples/build_system/make/toolchain/arm_iar.mk
+++ /dev/null
@@ -1,13 +0,0 @@
-# makefile for arm iar toolchain
-
-CC = iccarm
-AS = iasmarm
-LD = ilinkarm
-OBJCOPY = ielftool --silent
-SIZE = size
-
-# Enable extension mode (gcc compatible)
-CFLAGS += -e --debug --silent
-
-# silent mode
-ASFLAGS += -S $(addprefix -I,$(INC))
diff --git a/examples/build_system/make/toolchain/gcc_rules.mk b/examples/build_system/make/toolchain/gcc_rules.mk
index fc5225503..3463cad48 100644
--- a/examples/build_system/make/toolchain/gcc_rules.mk
+++ b/examples/build_system/make/toolchain/gcc_rules.mk
@@ -1,5 +1,3 @@
-SRC_S += $(SRC_S_GCC)
-
 # Assembly files can be name with upper case .S, convert it to .s
 SRC_S := $(SRC_S:.S=.s)
 
@@ -9,7 +7,7 @@ SRC_S := $(SRC_S:.S=.s)
 OBJ += $(addprefix $(BUILD)/obj/, $(SRC_S:.s=_asm.o))
 OBJ += $(addprefix $(BUILD)/obj/, $(SRC_C:.c=.o))
 
-CFLAGS += $(CFLAGS_GCC) -MD
+CFLAGS += -MD
 
 # LTO makes it difficult to analyze map file for optimizing size purpose
 # We will run this option in ci
@@ -25,18 +23,13 @@ ifeq ($(TOOLCHAIN),clang)
 CFLAGS += $(CFLAGS_CLANG)
 LDFLAGS += $(CFLAGS) $(LDFLAGS_CLANG)
 else
-LDFLAGS += $(CFLAGS) $(LDFLAGS_GCC)
+LDFLAGS += $(CFLAGS)
 endif
 
-# TODO should be removed after all examples are updated
 ifdef LD_FILE
 LDFLAGS += -Wl,-T,$(TOP)/$(LD_FILE)
 endif
 
-ifdef LD_FILE_GCC
-LDFLAGS += -Wl,-T,$(TOP)/$(LD_FILE_GCC)
-endif
-
 ASFLAGS += $(CFLAGS)
 
 # libc
diff --git a/examples/build_system/make/toolchain/iar_rules.mk b/examples/build_system/make/toolchain/iar_rules.mk
deleted file mode 100644
index 2c066f6da..000000000
--- a/examples/build_system/make/toolchain/iar_rules.mk
+++ /dev/null
@@ -1,44 +0,0 @@
-SRC_S += $(SRC_S_IAR)
-
-# Assembly files can be name with upper case .S, convert it to .s
-SRC_S := $(SRC_S:.S=.s)
-
-# Due to GCC LTO bug https://bugs.launchpad.net/gcc-arm-embedded/+bug/1747966
-# assembly file should be placed first in linking order
-# '_asm' suffix is added to object of assembly file
-OBJ += $(addprefix $(BUILD)/obj/, $(SRC_S:.s=_asm.o))
-OBJ += $(addprefix $(BUILD)/obj/, $(SRC_C:.c=.o))
-
-# Linker script
-LDFLAGS += --config $(TOP)/$(LD_FILE_IAR)
-
-# ---------------------------------------
-# Rules
-# ---------------------------------------
-
-# Compile .c file
-$(BUILD)/obj/%.o: %.c
-	@echo CC $(notdir $@)
-	@$(CC) $(CFLAGS) -c -o $@ $<
-
-# ASM sources lower case .s
-$(BUILD)/obj/%_asm.o: %.s
-	@echo AS $(notdir $@)
-	@$(AS) $(ASFLAGS) -c -o $@ $<
-
-# ASM sources upper case .S
-$(BUILD)/obj/%_asm.o: %.S
-	@echo AS $(notdir $@)
-	@$(AS) $(ASFLAGS) -c -o $@ $<
-
-$(BUILD)/$(PROJECT).bin: $(BUILD)/$(PROJECT).elf
-	@echo CREATE $@
-	@$(OBJCOPY) --bin $^ $@
-
-$(BUILD)/$(PROJECT).hex: $(BUILD)/$(PROJECT).elf
-	@echo CREATE $@
-	@$(OBJCOPY) --ihex $^ $@
-
-$(BUILD)/$(PROJECT).elf: $(OBJ)
-	@echo LINK $@
-	@$(LD) -o $@ $(LDFLAGS) $^
diff --git a/examples/device/net_lwip_webserver/Makefile b/examples/device/net_lwip_webserver/Makefile
index 9d8e8ec77..6002039b3 100644
--- a/examples/device/net_lwip_webserver/Makefile
+++ b/examples/device/net_lwip_webserver/Makefile
@@ -1,7 +1,7 @@
 include ../../../hw/bsp/family_support.mk
 
 # suppress warning caused by lwip
-CFLAGS_GCC += \
+CFLAGS += \
   -Wno-error=null-dereference \
   -Wno-error=unused-parameter \
   -Wno-error=unused-variable
diff --git a/examples/dual/host_hid_to_device_cdc/Makefile b/examples/dual/host_hid_to_device_cdc/Makefile
index a51251bf9..595cd7dec 100644
--- a/examples/dual/host_hid_to_device_cdc/Makefile
+++ b/examples/dual/host_hid_to_device_cdc/Makefile
@@ -8,7 +8,7 @@ INC += \
 EXAMPLE_SOURCE += $(wildcard src/*.c)
 SRC_C += $(addprefix $(EXAMPLE_PATH)/, $(EXAMPLE_SOURCE))
 
-CFLAGS_GCC += -Wno-error=cast-align -Wno-error=null-dereference
+CFLAGS += -Wno-error=cast-align -Wno-error=null-dereference
 
 SRC_C += \
 	src/class/hid/hid_host.c \
diff --git a/examples/dual/host_info_to_device_cdc/Makefile b/examples/dual/host_info_to_device_cdc/Makefile
index 659cf6ff9..3a1d87f57 100644
--- a/examples/dual/host_info_to_device_cdc/Makefile
+++ b/examples/dual/host_info_to_device_cdc/Makefile
@@ -8,7 +8,7 @@ INC += \
 EXAMPLE_SOURCE += $(wildcard src/*.c)
 SRC_C += $(addprefix $(EXAMPLE_PATH)/, $(EXAMPLE_SOURCE))
 
-CFLAGS_GCC += -Wno-error=cast-align -Wno-error=null-dereference
+CFLAGS += -Wno-error=cast-align -Wno-error=null-dereference
 
 SRC_C += \
 	src/host/hub.c \
diff --git a/examples/host/msc_file_explorer/Makefile b/examples/host/msc_file_explorer/Makefile
index 39d00d982..8c0b012ad 100644
--- a/examples/host/msc_file_explorer/Makefile
+++ b/examples/host/msc_file_explorer/Makefile
@@ -21,6 +21,6 @@ SRC_C += \
   $(FATFS_PATH)/ffunicode.c \
 
 # suppress warning caused by fatfs
-CFLAGS_GCC += -Wno-error=cast-qual
+CFLAGS += -Wno-error=cast-qual
 
 include ../../../hw/bsp/family_rules.mk
diff --git a/examples/host/msc_file_explorer/src/msc_app.c b/examples/host/msc_file_explorer/src/msc_app.c
index c7cc366b5..3f15bb84f 100644
--- a/examples/host/msc_file_explorer/src/msc_app.c
+++ b/examples/host/msc_file_explorer/src/msc_app.c
@@ -260,7 +260,7 @@ DRESULT disk_ioctl(BYTE  pdrv, /* Physical drive nmuber (0..) */
       return RES_OK;
 
     case GET_SECTOR_COUNT:
-      *((DWORD *)buff) = (WORD)tuh_msc_get_block_count(dev_addr, lun);
+      *((DWORD *)buff) = (DWORD)tuh_msc_get_block_count(dev_addr, lun);
       return RES_OK;
 
     case GET_SECTOR_SIZE: