一、搭建模板
如上一章所说选用origen板子作为移植的参考
1.1 搜索与origen/ORIGEN相关的文件
·grep "origen" -nR·
·grep "ORIGEN" -nR·
以下是搜索结果：
拷贝配置文件
configs/origen_defconfig
拷贝板级文件
board/samsung/origen/Kconfig
board/samsung/origen/MAINTAINERS
board/samsung/origen/Makefile
arch/arm/mach-exynos/Kconfig
拷贝头文件
include/configs/origen.h
文件关联
arch/arm/mach-exynos/Kconfig
arch/arm/mach-exynos/dmc_init_exynos4.c
arch/arm/mach-exynos/exynos4_setup.h
添加机器码
arch/arm/include/asm/mach-types.h
添加设备树支持
arch/arm/dts/Makefile
arch/arm/dts/exynos4210-origen.dts
1.2 拷贝配置文件
·cp configs/origen_defconfig configs/itop4412_defconfig` 拷贝origen板子的配置作为itop4412的配置。并将其中的ORIGEN/origen替换成ITOP4412/itop4412。
vim configs/itop4412_defconfig，使用正则进行替换:%s/origen/itop4412/g和:%s/ORIGEN/ITOP4412/g，并进行SOC替换（4210改为4412）
1.3 拷贝板级文件
·cp board/samsung/origen board/samsung/itop4412 -rf· 同样进行字符串替换
1.4 拷贝头文件
·cp include/configs/origen.h include/configs/itop4412.h· 同样进行字符串替换以及SOC替换，以及修改代码段位置
·#define CONFIG_SPL_TEXT_BASE 0x02023400·
1.5 文件关联
主要是修改上层调用的Kconfig和Makefile
·vim arch/arm/mach-exynos/Kconfig· 主要的工作是搜索origen/ORIGEN，将相应的操作为itop4412增加一份
···
index ed04369cfa..1b0e2d6ced 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -60,6 +60,10 @@ config TARGET_ORIGEN
bool "Exynos4412 Origen board"
select SUPPORT_SPL
+config TARGET_ITOP4412
+ bool "Exynos4412 Itop4412 board"
+ select SUPPORT_SPL
+
config TARGET_TRATS2
bool "Exynos4412 Trat2 board"
@@ -156,6 +160,7 @@ source "board/samsung/smdkv310/Kconfig"
source "board/samsung/trats/Kconfig"
source "board/samsung/universal_c210/Kconfig"
source "board/samsung/origen/Kconfig"
+source "board/samsung/itop4412/Kconfig"
source "board/samsung/trats2/Kconfig"
source "board/samsung/odroid/Kconfig"
source "board/samsung/arndale/Kconfig"
···
修改Makefile，支持Exynos4412。
由Makefile看到Exynos4210会去编译dmc_init_exynos4.c clock_init_exynos4.c，且两个文件均包含exynos4_setup.h，拷贝这三个文件并重命名，替换字符串。
·cp dmc_init_exynos4.c dmc_init_exynos4412.c·
·cp clock_init_exynos4.c clock_init_exynos4412.c·
·cp exynos4_setup.h exynos4412_setup.h·
···
diff --git a/arch/arm/mach-exynos/Makefile b/arch/arm/mach-exynos/Makefile
index e895c13157..b3efbbcf8a 100644
--- a/arch/arm/mach-exynos/Makefile
+++ b/arch/arm/mach-exynos/Makefile
@@ -13,6 +13,7 @@ ifdef CONFIG_SPL_BUILD
obj-$(CONFIG_EXYNOS5) += clock_init_exynos5.o
obj-$(CONFIG_EXYNOS5) += dmc_common.o dmc_init_ddr3.o
obj-$(CONFIG_EXYNOS4210)+= dmc_init_exynos4.o clock_init_exynos4.o
+obj-$(CONFIG_EXYNOS4412)+= dmc_init_exynos4412.o clock_init_exynos4412.o
obj-y += spl_boot.o tzpc.o
obj-y += lowlevel_init.o
endif
···
1.6 添加机器码
·vim arch/arm/include/asm/mach-types.h·
···
index 9f82efe007..e19b24b48a 100644
--- a/arch/arm/include/asm/mach-types.h
+++ b/arch/arm/include/asm/mach-types.h
@@ -5057,4 +5057,5 @@
#define MACH_TYPE_NASM25 5112
#define MACH_TYPE_TOMATO 5113
#define MACH_TYPE_OMAP3_MRC3D 5114
+#define MACH_TYPE_ITOP4412 5115
#endif
···
1.7 添加设备树支持
·cp arch/arm/dts/exynos4210-origen.dts arch/arm/dts/exynos4412-itop4412.dts· 同样替换字符串和SOC
修改Makefile，编译exynos4412-itop4412.dtb
···
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index dda4e59491..ea89e4db82 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -12,7 +12,8 @@ dtb-$(CONFIG_EXYNOS4) += exynos4210-origen.dtb \
exynos4210-universal_c210.dtb \
exynos4210-trats.dtb \
exynos4412-trats2.dtb \
- exynos4412-odroid.dtb
+ exynos4412-odroid.dtb \
+ exynos4412-itop4412.dtb
dtb-$(CONFIG_TARGET_HIKEY) += hi6220-hikey.dtb
···
做出以上修改，尝试编译·make itop4412_defconfig;make -j8·
1.8 跳过符号校验
CFG u-boot.cfg
CFGCHK u-boot.cfg
Error: You must add new CONFIG options using Kconfig
The following new ad-hoc CONFIG options were detected:
CONFIG_EXYNOS4412
CONFIG_ITOP4412
Please add these via Kconfig instead. Find a suitable Kconfig
file and add a 'config' or 'menuconfig' option.
Makefile:1002: recipe for target 'all' failed
make: *** [all] Error 1
对错误信息进行搜索，·grep "You must add new CONFIG options using Kconfig" -nR·
scripts/check-config.sh:53: echo >&2 "Error: You must add new CONFIG options using Kconfig"
直接搜索check-config.sh在哪里调用，·grep "check-config.sh" -nR·
Makefile:912:cmd_cfgcheck = $(srctree)/scripts/check-config.sh $2 \
scripts/check-config.sh:12:# check-config.sh
scripts/check-config.sh:15:# scripts/check-config.sh b/chromebook_link/u-boot.cfg kconfig_whitelist.txt .
由此可见是Makefile运行发生错误导致的，修改Makeifle
···
diff --git a/Makefile b/Makefile
index d799567535..a83013d285 100644
--- a/Makefile
+++ b/Makefile
@@ -908,9 +908,9 @@ cmd_pad_cat = $(cmd_objcopy) && $(append) || rm -f $@
cfg: u-boot.cfg
-quiet_cmd_cfgcheck = CFGCHK $2
-cmd_cfgcheck = $(srctree)/scripts/check-config.sh $2 \
- $(srctree)/scripts/config_whitelist.txt $(srctree)
+#quiet_cmd_cfgcheck = CFGCHK $2
+#cmd_cfgcheck = $(srctree)/scripts/check-config.sh $2 \
+# $(srctree)/scripts/config_whitelist.txt $(srctree)
all: $(ALL-y) cfg
ifeq ($(CONFIG_DM_I2C_COMPAT)$(CONFIG_SANDBOX),y)
···