feat: optimize startup and linking

sdk/software/bsp/common.mk

@@ -19,27 +19,34 @@ CFLAGS += -nostartfiles -nostdlib -nostdinc -static -fno-builtin
 CFLAGS += -DCLOCKS_PER_SEC=CORE_CLOCKS_PER_SEC -D_CLOCKS_PER_SEC_=CORE_CLOCKS_PER_SEC
 CFLAGS += -DUSE_CPU_CLOCK_COUNT
 
+LINKER_SCRIPT ?= $(COMMON_DIR)/env/script.lds
+BSP_STARTUP ?= $(COMMON_DIR)/env/start.S
+BSP_USE_TRAP ?= 1
+BSP_USE_DRIVERS ?= 1
+
 #若使用 newlib , 将下面的 -lsemihost 替换为 -lgloss
 LDFLAGS +=  	-T $(LINKER_SCRIPT) \
 				-Wl,--gc-sections -Wl,--check-sections \
 				-lc -lm -lg -lsemihost -lgcc -L$(PICOLIBC_DIR)/lib
 
-LINKER_SCRIPT := $(COMMON_DIR)/env/script.lds
-
-ASM_SRCS += $(COMMON_DIR)/env/start.S 
+ASM_SRCS += $(BSP_STARTUP)
 
+ifeq ($(BSP_USE_TRAP),1)
 ifeq ($(TARGET), RTThread_Nano)
 
 else
 ASM_SRCS += $(COMMON_DIR)/env/trap_handler.S 
 endif
+endif
 
+ifeq ($(BSP_USE_DRIVERS),1)
 C_SRCS   += $(COMMON_DIR)/drivers/confreg_time.c
 C_SRCS   += $(COMMON_DIR)/drivers/core_time.c
 C_SRCS   += $(COMMON_DIR)/drivers/common_func.c
 C_SRCS   += $(COMMON_DIR)/drivers/dvi.c \
 			$(COMMON_DIR)/drivers/led.c \
 			$(COMMON_DIR)/drivers/seg7.c
+endif
 
 INCLUDES += -I./ \
 			-I$(COMMON_DIR)/include \