u-boot-2016.05移植：(1)、建立新板并配置，使能正常编译通过

转载地址：http://blog.youkuaiyun.com/sinat_24088685/article/details/52060169

(1)、建立新板并配置，使能正常编译通过

移植u-boot-2016.05到JZ2440开发板（在smdk2410基础上修改）： 

1、在include/configs中复制smdk2410.h拷贝为smdk2440.h。 
2、在board/samsung中复制smdk2410文件夹拷贝为smdk2440，进入smdk2440文件夹，将smdk2410.c重命名为smdk2440.c，并将该文件夹下的Makefile文件中smdk2410.o改为smdk2440.o。 
3、修改顶层Makefile文件，添加：

ARCH=arm
CROSS_COMPILE ?= arm-linux-

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4、在configs文件夹下复制smdk2410_defconfig拷贝为smdk2440_defconfig，并将其中的2410替换为2440。 
5、在arch/arm/Kconfig中添加：

config TARGET_SMDK2440
        bool "Support smdk2440"
        select CPU_ARM920T

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source "board/samsung/smdk2440/Kconfig"

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4、经过上面的修改，运行配置命令make smdk2440_defconfig，然后尝试make，出现下面的错误：

include/config.h:5:22: error: configs/.h: No such file or directory

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错误显示：在include/config.h中出现的configs/.h并不能找到，对比编译2410生成的config.h文件，可见是config.h文件生成错误。要解决问题首先我们要找到生成config.h文件的地方，在顶层Makefile文件中找了很久都没找到生成config.h文件的地方，然后就有点无从下手了，偶然想到既然config.h是生成的文件，那么其中的注释/* Automatically generated - do not edit */应该是通过echo命令输出到config.h文件的，搜索 Automatically generated - do not edit 就应该可以找到生成config.h的地方。 
搜索Automatically generated - do not edit，找到scripts/Makefile.autoconf文件，发现config.h正是在它里面生成的：

...

# include/config.h
# Prior to Kconfig, it was generated by mkconfig. Now it is created here.
define filechk_config_h
        (echo "/* Automatically generated - do not edit */";            \
        for i in $$(echo $(CONFIG_SYS_EXTRA_OPTIONS) | sed 's/,/ /g'); do \
                echo \#define CONFIG_$$i                                \
                | sed '/=/ {s/=/        /;q; } ; { s/$$/        1/; }'; \
        done;                                                           \
        echo \#define CONFIG_BOARDDIR board/$(if $(VENDOR),$(VENDOR)/)$(BOARD);\
        echo \#include \<config_defaults.h\>;                           \
        echo \#include \<config_uncmd_spl.h\>;                          \
        echo \#include \<configs/$(CONFIG_SYS_CONFIG_NAME).h\>;         \
        echo \#include \<asm/config.h\>;                                \
        echo \#include \<config_fallbacks.h\>;)
endef

...

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由此可见，之所以在config.h中出现configs/.h，是因为CONFIG_SYS_CONFIG_NAME为空的原因。 
参阅doc/README.kconfig文件中建新板步骤：

Tips to add/remove boards
-------------------------

When adding a new board, the following steps are generally needed:

 [1] Add a header file include/configs/<target>.h
 [2] Make sure to define necessary CONFIG_SYS_* in Kconfig:
       Define CONFIG_SYS_CPU="cpu" to compile arch/<arch>/cpu/<cpu>
       Define CONFIG_SYS_SOC="soc" to compile arch/<arch>/cpu/<cpu>/<soc>
       Define CONFIG_SYS_VENDOR="vendor" to compile board/<vendor>/common/*
         and board/<vendor>/<board>/*
       Define CONFIG_SYS_BOARD="board" to compile board/<board>/*
         (or board/<vendor>/<board>/* if CONFIG_SYS_VENDOR is defined)
       Define CONFIG_SYS_CONFIG_NAME="target" to include
         include/configs/<target>.h
 [3] Add a new entry to the board select menu in Kconfig.
     The board select menu is located in arch/<arch>/Kconfig or
     arch/<arch>/*/Kconfig.
 [4] Add a MAINTAINERS file
     It is generally placed at board/<board>/MAINTAINERS or
     board/<vendor>/<board>/MAINTAINERS
 [5] Add configs/<target>_defconfig

When removing an obsolete board, the following steps are generally needed:

 [1] Remove configs/<target>_defconfig
 [2] Remove include/configs/<target>.h if it is not used by any other boards
 [3] Remove board/<vendor>/<board>/* or board/<board>/* if it is not used
     by any other boards
 [4] Update MAINTAINERS if necessary
 [5] Remove the unused entry from the board select menu in Kconfig
 [6] Add an entry to doc/README.scrapyard

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可见，要正确生成include/config.h文件，需要配置board/samsung/smdk2440/Kconfig文件，将其中的2410改为2440。