if TARGET_ALT config SYS_BOARD default "alt" config SYS_VENDOR default "renesas" config SYS_CONFIG_NAME default "alt" config R8A7794_ETHERNET_B bool "Use ethernet B function" depends on TARGET_ALT default n help ALT board can use default ethernet and etnernet B function. This config set pin function of ethenet B. You also needt to change DIP switch of board in order to use this function. endif