在 U-Boot 中添加自己的开发板

旗帜哥

arm-linux-gnueabihf-gcc -Wp,-MD,arch/arm/imx-common/.init.o.d  -nostdinc -isystem /usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/4.9.4/include -Iinclude   -I./arch/arm/include -include ./include/linux/kconfig.h -D__KERNEL__ -D__UBOOT__ -Wall -Wstrict-prototypes -Wno-format-security -fno-builtin -ffreestanding -Os -fno-stack-protector -fno-delete-null-pointer-checks -g -fstack-usage -Wno-format-nonliteral -Werror=date-time -D__ARM__ -marm -mno-thumb-interwork -mabi=aapcs-linux -mword-relocations -fno-pic -mno-unaligned-access -ffunction-sections -fdata-sections -fno-common -ffixed-r9 -msoft-float -pipe -march=armv7-a    -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(init)"  -D"KBUILD_MODNAME=KBUILD_STR(init)" -c -o arch/arm/imx-common/init.o arch/arm/imx-common/init.c
make[1]: *** 没有规则可制作目标“board/freescale/mx6ull_alientek_emmc/mx6ull_alientek_emmc.o”，由“board/freescale/mx6ull_alientek_emmc/built-in.o” 需求。 停止。
Makefile:1197: recipe for target 'board/freescale/mx6ull_alientek_emmc' failed
make: *** [board/freescale/mx6ull_alientek_emmc] Error 2
make: *** 正在等待未完成的任务....
这需要怎么修改？