移植u-boot问题：include/config.h:6:10: fatal error: configs/.h: No such file or directory_needed by 'include/config/uboot.release

在移植新的u-boot 2019到i.MX6UL平台的时候遇到了如下编译问题：

$ make mx6ul_14x14_evk_defconfig
#
# configuration written to .config
#
$ make u-boot.imx    
scripts/kconfig/conf  --syncconfig Kconfig
  CHK     include/config.h
  UPD     include/config.h
  CFG     u-boot.cfg
  GEN     include/autoconf.mk.dep
  CFG     spl/u-boot.cfg
In file included from ./include/common.h:17:
include/config.h:6:10: fatal error: configs/.h: No such file or directory
    6 | #include <configs/.h>
      |          ^~~~~~~~~~~~
In file included from ./include/common.h:17:
include/config.h:6:10: fatal error: configs/.h: No such file or directory
    6 | #include <configs/.h>
      |          ^~~~~~~~~~~~
compilation terminated.
compilation terminated.
In file included from ./include/common.h:17:
include/config.h:6:10: fatal error: configs/.h: No such file or directory
    6 | #include <configs/.h>
      |          ^~~~~~~~~~~~
compilation terminated.
scripts/Makefile.autoconf:80: recipe for target 'spl/u-boot.cfg' failed
make[1]: *** [spl/u-boot.cfg] Error 1
make[1]: *** Waiting for unfinished jobs....
scripts/Makefile.autoconf:48: recipe for target 'include/autoconf.mk.dep' failed
make[1]: *** [include/autoconf.mk.dep] Error 1
scripts/Makefile.autoconf:77: recipe for target 'u-boot.cfg' failed
make[1]: *** [u-boot.cfg] Error 1
make: *** No rule to make target 'include/config/auto.conf', needed by 'include/config/uboot.release'.  Stop.
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遇到这种情况主要检查两个地方的Kconfig文件，首先是board/freescale/mx6ul_14x14_evk/Kconfig：

if TARGET_MX6UL_14X14_EVK || TARGET_MX6UL_9X9_EVK

config SYS_BOARD
        default "mx6ul_14x14_evk"

config SYS_VENDOR
        default "freescale"

config SYS_CONFIG_NAME
        default "mx6ul_14x14_evk"

endif
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另外一个地方是arch/arm/mach-imx/mx6/Kconfig：

config TARGET_MX6UL_14X14_EVK
        bool "mx6ul_14x14_evk"
        select BOARD_LATE_INIT
        select DM
        select DM_THERMAL
        select MX6UL
        select SUPPORT_SPL
        imply CMD_DM

source "board/freescale/mx6ul_14x14_evk/Kconfig"
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这两个文件里面的配置缺一不可，我这里是由于忘掉了source "board/freescale/mx6ul_14x14_evk/Kconfig"这行代码导致的编译出错，把这行代码加上就可以解决该问题。