clr_gd、clbss_l undefined reference(2018-07-01)

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出错信息：

arch/arm/lib/built-in.o: In function `clr_gd':

/root/u-boot-2015.10/arch/arm/lib/crt0.S:110: undefined reference to `board_init_f'

arch/arm/lib/built-in.o: In function `clbss_l':

/root/u-boot-2015.10/arch/arm/lib/crt0.S:179: undefined reference to `coloured_LED_init'

/root/u-boot-2015.10/arch/arm/lib/crt0.S:180: undefined reference to `red_led_on'

/root/u-boot-2015.10/arch/arm/lib/crt0.S:186: undefined reference to `board_init_r'

出错原因：缺少宏定义

#define CONFIG_SYS_GENERIC_BOARD

解决办法：在<board>.h中添加如下定义即可

#define CONFIG_SYS_GENERIC_BOARD