继ok6410 u-boot-2012.04.01移植六后，开发板已支持MLC NAND、DM9000等。但还需要完善比如环境变量、mtdpart分区、裁剪、制作补丁等。下面的工作就是完善移植的u-boot。
开发环境：
系统：ubuntu 10.04.4
单板：ok6410
NAND FLASH：K9GAG08U0D 2048MB
NOR Flash：EN29LV160AB 2MB
DDR:K4X1G163PCX2 256MB
NET：DM9000AEP
编译器：arm-linux-gcc-4.3.2
搭建开发环境详见ubuntu 10.04.4开发环境配置。
目标：
1.板级初始化,支持单板ok6410
2.修改u-boot,支持NAND启动
3.增加菜单update功能
4.增加MLC NAND支持
5.支持DM9000,网卡下载程序
6.修改环境变量以及mtdpart分区
7.u-boot裁剪及制作补丁
一、修改环境变量
根据u-boot启动界面输出的using default environment，找到common/enc_common.c,还可以通过save命令找到env_nand.c,就不进一步分析了，直接修改代码。修改smdk6410.h
#define CONFIG_SYS_MALLOC_LEN (CONFIG_ENV_SIZE + 512*1024)
#define CONFIG_ENV_IS_IN_NAND
#define CONFIG_ENV_SIZE 0x80000//0x4000 /* Total Size of Environment Sector */
#define CONFIG_ENV_OFFSET 0x80000
#define CONFIG_ENV_RANGE CONFIG_ENV_SIZE
接着编译测试
SMDK6410 # set bootdelay 5
SMDK6410 # save
Saving Environment to NAND...
Erasing Nand...
nand0: MTD Erase failure: -22
Writing to Nand... done
SMDK6410 # reset
重启发现没有保存，看来还有问题，根据提示继续修改
change@change:/si/OK6410/u-boot-2012.04.01$ grep "MTD Erase failure" * -nR
Binary file drivers/mtd/nand/libnand.o matches
drivers/mtd/nand/nand_util.c:149: printf("\n%s: MTD Erase failure: %d\n",
ok,去drivers/mtd/nand/nand_util.c:149
result = meminfo->erase(meminfo, &erase);
if (result != 0) {
printf("\n%s: MTD Erase failure: %d\n",
mtd_device, result);
continue;
}
没看出啥问题，那还是从save命令分析saveenv()是在common/env_nand.c中实现的，进去看看，加了很多打印语句还是没找到。后来在头文件include/asm-generic/errno.h找到#define EINVAL 22 /* Invalid argument */原来failure: -22是参数问题。输的u-boot命令肯定没问题。没办法只好到配置文件smdk6410.h找问题。仔细看了一遍还真找到了，原来#define CONFIG_ENV_OFFSET 0x40000没有改成#define CONFIG_ENV_OFFSET 0x80000。因为K9GAG08U0D的BLOCK SIZE是512K。下面测试
SMDK6410 # set bootdelay 5
SMDK6410 # save
Saving Environment to NAND...
Erasing Nand...
Erasing at 0x80000 -- 100% complete.
Writing to Nand... done
SMDK6410 # reset
resetting ...
U-Boot 2012.04.01 (Jul 09 2013 - 21:30:25) for SMDK6400
CPU: S3C6400@532MHz
Fclk = 532MHz, Hclk = 133MHz, Pclk = 66MHz (ASYNC Mode)
Board: SMDK6400
DRAM: 128 MiB
WARNING: Caches not enabled
Flash: 0 KB
NAND: select s3c_nand_oob_mlc_64
NAND_ECC_NONE selected by board driver. This is not recommended !!
2048 MiB
In: serial
Out: serial
Err: serial
Net: dm9000
Hit any key to stop autoboot: 0
##### Update menu for ok6410 #####
[g] get file, and write to nand flash 0 block
[b] Boot the system
[r] Reset the u-boot
[q] Quit from menu
Enter your selection: q
SMDK6410 #
重启发现bootdelay变为5，正常了。
二、修改mtdpart分区
这个比较简单，仿照别人做法，直接在配置文件smdk6410.h增加如下：
/*-----------------------------------------------------------------------
* Dynamic MTD partition support
*/
#define CONFIG_CMD_MTDPARTS
#define CONFIG_MTD_DEVICE /* needed for mtdparts commands */
//#define CONFIG_FLASH_CFI_MTD
#define MTDIDS_DEFAULT "nand0=OK6410-0"
#define MTDPARTS_DEFAULT "mtdparts=OK6410-0:512k(u-boot)," \
"512k(params)," \
"4M(kernel)," \
"-(rootfs)"
添加后编译在测试
SMDK6410 # mtdparts default
SMDK6410 # mtdparts
device nand0 <OK6410-0>, # parts = 4
#: name size offset mask_flags
0: u-boot 0x00080000 0x00000000 0
1: params 0x00080000 0x00080000 0
2: kernel 0x00400000 0x00100000 0
3: rootfs 0x7fb00000 0x00500000 0
active partition: nand0,0 - (u-boot) 0x00080000 @ 0x00000000
defaults:
mtdids : nand0=OK6410-0
mtdparts: mtdparts=OK6410-0:512k(u-boot),512k(params),4M(kernel),-(rootfs)
SMDK6410 #
测试基本正常。下面制作补丁。
三、整个移植代码修改量比较大，这里制作一个补丁文件，大家直接打个补丁就可以用了。
change@change:/si/OK6410/u-boot-2012.04.01$ make distclean
change@change:/si/OK6410/u-boot-2012.04.01$ cd ..
change@change:/si/OK6410$ mv u-boot-2012.04.01 u-boot-2012.04.01_ok
change@change:/si/OK6410$ tar xjf u-boot-2012.04.01.tar.bz2
change@change:/si/OK6410$ diff -urN u-boot-2012.04.01 u-boot-2012.04.01_ok > u-boot-2012.04.01_ok6410.patch
change@change:/si/OK6410$
生成补丁文件u-boot-2012.04.01_ok6410.patch，不想做繁琐的修改，打个上面的补丁文件就OK了。打补丁方法如下：
change@change:/si/OK6410/u-boot-2012.04.01$ patch -p1 < ../u-boot-2012.04.01_ok6410.patch
patching file arch/arm/config.mk
patching file arch/arm/cpu/arm1176/start.S
patching file arch/arm/include/asm/arch-s3c64xx/s3c6400.h
patching file arch/arm/lib/board.c
patching file board/samsung/smdk6410/config.mk
patching file board/samsung/smdk6410/.gitignore
patching file board/samsung/smdk6410/init.c
patching file board/samsung/smdk6410/lowlevel_init.S
patching file board/samsung/smdk6410/Makefile
patching file board/samsung/smdk6410/sdram.c
patching file board/samsung/smdk6410/smdk6400_nand_spl.c
patching file board/samsung/smdk6410/smdk6410.c
patching file board/samsung/smdk6410/u-boot-nand.lds
patching file common/cmd_menu.c
patching file common/env_nand.c
patching file common/main.c
patching file common/Makefile
patching file drivers/mtd/nand/nand_base.c
patching file drivers/mtd/nand/s3c64xx.c
patching file include/common.h
patching file include/configs/smdk6410.h
patching file include/linux/mtd/mtd-abi.h
patching file Makefile
change@change:/si/OK6410/u-boot-2012.04.01$ make
System not configured - see README
make: *** [all] Error 1
change@change:/si/OK6410/u-boot-2012.04.01$ make smdk6410_config
warning: Please migrate to boards.cfg. Failure to do so will
mean removal of your board in the next release.
Configuring for smdk6410 board...
change@change:/si/OK6410/u-boot-2012.04.01$ make
编译ok就可以用了。想偷懒可以这样做，最简单。但不建议，自己亲自移植一遍更能学到东西。至此ok6410 u-boot-2012.04.01移植部分告一段落，下一篇linux移植。