config SYS_SOC
string
help
This option should contain the SoC name to build the directory
arch/<CONFIG_SYS_ARCH>/cpu/<CONFIG_SYS_CPU>/<CONFIG_SYS_SOC>.
This is optional. For those targets without the SoC directory,
leave this option empty.
config SYS_VENDOR
string
help
This option should contain the vendor name of the target board.
If it is set and
board/<CONFIG_SYS_VENDOR>/common/Makefile exists, the vendor common
directory is compiled.
If CONFIG_SYS_BOARD is also set, the sources under
board/<CONFIG_SYS_VENDOR>/<CONFIG_SYS_BOARD> directory are compiled.
This is optional. For those targets without the vendor directory,
leave this option empty.
config SYS_BOARD
string
help
This option should contain the name of the target board.
If it is set, either board/<CONFIG_SYS_VENDOR>/<CONFIG_SYS_BOARD>
or board/<CONFIG_SYS_BOARD> directory is compiled depending on
whether CONFIG_SYS_VENDOR is set or not.
This is optional. For those targets without the board directory,
leave this option empty.
config SYS_CONFIG_NAME
string
help
This option should contain the base name of board header file.
The header file include/configs/<CONFIG_SYS_CONFIG_NAME>.h
should be included from include/config.h.
同时在arch/Kconfig中又会加载其他目录下的Kconfig，如 source “arch/arm/Kconfig”，在arch/arm/Kconfig中又会加载board目录下的Kconfig，如 source “board/samsung/smdk2410/Kconfig”，下面我们看一下board/samsung/smdk2410/Kconfig中的内容：
不错，就是在这里对.config中的那几个配置赋了值，可以看到，第一个行用TARGET_SMDK2410进行了判断，这个在arch/arm/Kconfig中：
意思是： 如果选择的是smd2410，TARGET_SMDK2410会被选择，然后board/samsung/smdk2410/Kconfig会对CONFIG_SYS_CPU、CONFIG_SYS_SOC、CONFIG_SYS_VENDOR、CONFIG_SYS_BOARD、CONFIG_SYS_CONFIG_NAME赋值：
