uboot修改源码之支持烧写文件系统

烧写文件系统

    tftp 30000000 fs_mini_mdev.jffs2

    nand erase.part root

    nand write.jffs2 30000000 260000 5b89a8

 

启动之前修改启动参数

    set  bootargs  console=ttySAC0 root=/dev/mtdblock3 rootfstype=jffs2    //重新设置文件系统属性

    bootm     //启动

s3c2410iis_probe...
UDA1341 audio driver initialized
ALSA device list:
  No soundcards found.
TCP cubic registered
NET: Registered protocol family 1
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
s3c2410-sdi s3c2410-sdi: running at 0kHz (requested: 0kHz).
s3c2410-sdi s3c2410-sdi: running at 98kHz (requested: 97kHz).
s3c2410-sdi s3c2410-sdi: running at 98kHz (requested: 97kHz).
VFS: Mounted root (jffs2 filesystem).            //挂载成功
Freeing init memory: 140K
init started: BusyBox v1.7.0 (2008-01-22 10:04:09 EST)
starting pid 765, tty '': '/etc/init.d/rcS

 

烧写yaffs文件系统

    tftp 30000000 fs_mini_mdev.yaffs2

    nand erase.part rootfs

    nand write.yaffs 30000000 260000 889bc0    

     或者直接一起输入：tftp 30000000 fs_mini_mdev.yaffs2;nand erase.part rootfs;nand write.yaffs 30000000 260000 889bc0 

 

    启动会出现如下错误

SMDK2410 #  nand write.yaffs2 30000000 260000 889bc0


NAND write: device 0 offset 0x260000, size 0x889bc0
Unknown nand command suffix '.yaffs'.

 

根据错误信息，在cmd_nand.c里搜索.yaffs，可以知道需要加入CONFIG_CMD_NAND_YAFFS的宏,

#ifdef CONFIG_CMD_NAND_YAFFS
        } else if (!strcmp(s, ".yaffs")) {
            if (read) {
                printf("Unknown nand command suffix '%s'.\n", s);
                return 1;
            }
            ret = nand_write_skip_bad(nand, off, &rwsize,
                        (u_char *)addr, WITH_YAFFS_OOB);
#endif

 

重新编译程序，烧写文件系统

VFS: Mounted root (yaffs filesystem).
Freeing init memory: 140K
Warning: unable to open an initial console.
Kernel panic - not syncing: No init found.  Try passing init= option to kernel.

 

然后对比烧到板子里的文件和原来的文件系统，可以发现烧写的不一样，然后定位到程序中nand_util.c中，有些东西需要修改

 

  if (!need_skip && !(flags & WITH_DROP_FFS) && !(flags & WITH_YAFFS_OOB)) {    //需要加!(flags & WITH_YAFFS_OOB)判断，但是韦东山视频里没有说明，直接比较两个文件才知道需要加入这个参数
        rval = nand_write (nand, offset, length, buffer);
        if (rval == 0)
            return 0;


        *length = 0;
        printf ("NAND write to offset %llx failed %d\n",
            offset, rval);
        return rval;
    } 




            ops.len = pagesize;
            ops.ooblen = nand->oobsize;
            ops.mode = MTD_OOB_RAW;        //读取原来自己的oob
            ops.ooboffs = 0;


            for (page = 0; page < pages; page++) {
                WATCHDOG_RESET();


                ops.datbuf = p_buffer;
                ops.oobbuf = ops.datbuf + pagesize;


                rval = nand->write_oob(nand, offset, &ops);
                if (rval)        /*如果是非0才错误*/
                    break;

                offset += pagesize;
                p_buffer += pagesize_oob;
            }

 

 

再重新编译烧写，测试文件系统

tftp 30000000 u-boot.bin;protect off all;erase 0 3ffff;cp.b 30000000 0 40000

VFS: Mounted root (yaffs filesystem).
Freeing init memory: 140K
init started: BusyBox v1.7.0 (2008-01-22 10:04:09 EST)    //可以正常启动busybox
starting pid 764, tty '': '/etc/init.d/rcS'
s3c2410-sdi s3c2410-sdi: running at 0kHz (requested: 0kHz).
s3c2410-sdi s3c2410-sdi: running at 98kHz (requested: 97kHz).
s3c2410-sdi s3c2410-sdi: running at 98kHz (requested: 97kHz).

 

制作补丁

将制作完成的uboot目录  和解压缩出来的原来目录用diff命令去实现

    make distclean     //首先清除所有文件

    diff -urN  老目录  新目录 > my_1st_uboot.pach

打补丁  patch -p1 < 补丁文件        p的参数根据当前打补丁的目录决定