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makefilearmstm32u-boot

Where is the variable (such as CONFIG_DM_MMC) of "xxxxxdefconfig file" defined in u-boot ？

CONFIG_OF_CONTROL=y
CONFIG_OF_EMBED=y
CONFIG_DEFAULT_DEVICE_TREE="stm32h743i-eval"
CONFIG_DM_MMC=y
CONFIG_STM32_SDMMC2=y

I can not find oud the variable on the left in u-boot project.

Solution 
  • grep -GHrn 'config DM_MMC'

    yields

    drivers/mmc/Kconfig:26:config DM_MMC

    So this is the Kconfig file where you find the definition.

    https://www.kernel.org/doc/html/latest/kbuild/kconfig-language.html is a good start to learn about configuration variables.