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移植最新内核3.4.2

一. 内核启动流程,据此配置内核(机器ID)
1.1 修改Makefile
1.2 选择默认配置 : make s3c2410_defconfig
1.3 make uImage

步骤1:
在UBOOT里:
  set machid 16a // smdk2440 mach-smdk2440.c

  set machid 7CF // mini2440 mach-mini2440.c

步骤2:
  arch\arm\mach-s3c24xx\mach-smdk2440.c
  s3c24xx_init_clocks(16934400);
改为
  s3c24xx_init_clocks(12000000);

步骤3:
配置/编译: make s3c2410_defconfig 或 make mini2440_defconfig
  make uImage

步骤4:
在uboot里:set bootargs console=ttySAC0,115200 .....

 


uboot的默认MACH ID:
gd->bd->bi_arch_number = MACH_TYPE_SMDK2410; // 193
如果s = getenv("machid");成功,则使用它
否则使用默认的

  set machid 16a // smdk2440 mach-smdk2440.c
  set machid 7CF // mini2440 mach-mini2440.c

  nfs 32000000 192.168.1.123:/work/nfs_root/uImage_new
  bootm 32000000

二. 修改分区, 制作新的文件系统


  nfs 30000000 192.168.1.123:/work/nfs_root/fs_mini_mdev.yaffs2
  nand erase.part rootfs
  nand write.yaffs 30000000 260000 889bc0

  nfs 30000000 192.168.1.123:/work/nfs_root/fs_mini_mdev.jffs2
  nand erase.part rootfs
  nand write.jffs2 30000000 260000 $filesize
  set bootargs console=ttySAC0,115200 root=/dev/mtdblock3 rootfstype=jffs2


制作文件系统
1. 交叉编译busybox
安装:make install CONFIG_PREFIX=/work/nfs_root/fs_mini_mdev_new

2. 安装库
  mkdir /work/nfs_root/fs_mini_mdev_new/lib
  mkdir /work/nfs_root/fs_mini_mdev_new/usr/lib -p

  cp /usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/armv4t/lib/*so* /work/nfs_root/fs_mini_mdev_new/lib -d
  cp /usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/armv4t/usr/lib/*so* /work/nfs_root/fs_mini_mdev_new/usr/lib -d

3. 构建etc目录
4. 构建dev目录
5. 其他空目录

  mkfs.jffs2 -n -s 2048 -e 128KiB -d fs_mini_mdev_new -o fs_mini_mdev_new.jffs2

烧写:
  nfs 30000000 192.168.1.123:/work/nfs_root/fs_mini_mdev_new.jffs2
  nand erase.part rootfs
  nand write.jffs2 30000000 260000 $filesize
  set bootargs console=ttySAC0,115200 root=/dev/mtdblock3 rootfstype=jffs2
  nfs 32000000 192.168.1.123:/work/nfs_root/uImage_new
  bootm 32000000

  SIGILL illegal instruction
6. 重新配置内核支持EABI
  set bootargs console=ttySAC0,115200 root=/dev/mtdblock3 rootfstype=jffs2
  nfs 32000000 192.168.1.123:/work/nfs_root/uImage_eabi
  bootm 32000000

三. 移植YAFFS文件系统
1. 获得源码
  git clone git://www.aleph1.co.uk/yaffs2

2. 打补丁

  cd yaffs-dir
  ./patch-ker.sh c m linux-tree 比如 ./patch-ker.sh c m /work/system/linux-3.4.2

3. 配置内核支持YAFFS

4. 编译、使用uImage

5. 制作、烧写yaffs映象
  mkyaffs2image fs_mini_mdev_new fs_mini_mdev_new.yaffs2
  uboot:
  nfs 30000000 192.168.1.123:/work/nfs_root/fs_mini_mdev_new.yaffs2
  nand erase.part rootfs
  nand write.yaffs 30000000 260000 $filesize

6. 启动
  set bootargs console=ttySAC0,115200 root=/dev/mtdblock3
  nfs 32000000 192.168.1.123:/work/nfs_root/uImage_yaffs
  bootm 32000000

7. 没成功,用替代法查找问题
7.1 UBOOT可能有问题:换上1.1.6的UBOOT
  tftp 30000000 u-boot.bin
  nand erase.part u-boot
  nand write 30000000 u-boot
  reset
  nfs 30000000 192.168.1.123:/work/nfs_root/fs_mini_mdev_new.yaffs2
  nand erase rootfs
  nand write.yaffs 30000000 260000 $(filesize)
  set bootargs console=ttySAC0,115200 root=/dev/mtdblock3
  nfs 32000000 192.168.1.123:/work/nfs_root/uImage_yaffs
  bootm 32000000

发现1.1.6的UBOOT没问题,所以就是我们移植的新UBOOT有BUG:
  drivers\mtd\nand\Nand_util.c

  if (!need_skip && !(flags & WITH_DROP_FFS)) {
改为
  if (!need_skip && !(flags & WITH_DROP_FFS) && !(flags & WITH_YAFFS_OOB)) {


7.2 YAFFS映象可能有问题


制作了u-boot_new.bin, uImage_new, fs_mini_mdev_new.yaffs
重烧整个系统:
使用jtag工具烧u-boot_new.bin
或使用uboot来更新自己: tftp 30000000 u-boot_new.bin; nand erase.part u-boot; nand write 30000000 u-boot
启动uboot,用它来烧写内核、FS
  tftp 30000000 uImage_new; nand erase.part kernel; nand write 30000000 kernel
  tftp 30000000 fs_mini_mdev_new.yaffs2; nand erase.part rootfs; nand write.yaffs 30000000 260000 $filesize

设置参数
  set ‘nand read 30000000 kernel;bootm 30000000‘
  set bootargs console=ttySAC0,115200 root=/dev/mtdblock3
  set machid 16a
  save


使用内核补丁:
  patch -p1 < ../linux-3.4.2_100ask.patch
  cp config_ok .config
  make uImage

 【转】韦东山 老师教学笔记

 

移植最新内核3.4.2