u-boot compile

make smdk6410_config

make found smdk6410_config: target unconfig:

smdk6410_config: unconfig

@echo "----------------------"
@echo $(@)

# The target is smdk6410_config
@echo "----------------------"
@echo $(MKCONFIG)

#/home/km/arm/uboot/uboot/mkconfig is a script
@echo "----------------------"
@echo $(@:_config=) arm s3c64xx smdk6410 samsung s3c6410

# $@ remove _config is smdk6410 | arm architecture | s3c64xx cpu type | smdk6410 board | samsung merchant | s3c6410 soc name
@echo "----------------------"
@$(MKCONFIG) $(@:_config=) arm s3c64xx smdk6410 samsung s3c6410
# Execute this script and parameters

unconfig: #Display information and delete files

# $(obj) can keep the source file clean. You can use export BUILD_DIR=/home/km//arm/uboot/uboot/dist to change the value of obj. The default is empty.
@echo x $(obj) x
@echo $(obj)board/*/config.tmp
# Need to delete include/config.h and include/config.mk files.
# board/*/config.tmp file board/*/*/config.tmp two temporary files
@rm -f $(obj)include/config.h $(obj)include/config.mk
$(obj)board/*/config.tmp $(obj)board/*/*/config.tmp

The result is two files generated

config.h:

/* Automatically generated - do not edit */
#include

config.mk

ARCH   = arm
CPU    = s3c64xx
BOARD  = smdk6410
VENDOR = samsung
SOC    = s3c6410

mkconfig file parsing:

_asm__ __volatile__("": ​​: :"memory"); This is inline assembly.