列出你SD卡的信息:
Disk /dev/mmcblk0: 7969 MB, 7969177600 bytes 4 heads, 16 sectors/track, 243200 cylinders, total 15564800 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/mmcblk0p2 43008 247807 102400 83 Linux /dev/mmcblk0p3 247808 15564799 7658496 83 Linux
将/dev/mmcblk0p2 和/dev/mmcblk0p3 等卸载
开始使用fdisk 操作SD卡
Command (m for help):
输入p,打印sd信息:
Command (m for help): p
Disk /dev/mmcblk0: 7969 MB, 7969177600 bytes 4 heads, 16 sectors/track, 243200 cylinders, total 15564800 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/mmcblk0p2 43008 247807 102400 83 Linux /dev/mmcblk0p3 247808 15564799 7658496 83 Linux 输入d删除/dev/mmcblk0p2,/dev/mmcblk0p3,他们对应part2,part3
Command (m for help): d Partition number (1-4): 2
Command (m for help): d Selected partition 3
用n新建分区 Command (m for help): n Partition type: p primary (0 primary, 0 extended, 4 free) e extended Select (default p): 这里选p,然后进入分区.SD卡可以分为4个part,我们先分part 1:
Partition number (1-4, default 1): 1 默认是从2048开始的,为了给uboot留意下空间大于20M,这里没关系.我们从4380开始.大小为50M,存放linux kernel. First sector (2048-15564799, default 2048): 4380 Last sector, +sectors or +size{K,M,G} (4380-15564799, default 15564799): +50M 输入p查看: Command (m for help): p
Disk /dev/mmcblk0: 7969 MB, 7969177600 bytes 4 heads, 16 sectors/track, 243200 cylinders, total 15564800 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/mmcblk0p1 4380 106779 51200 83 Linux
接下来分part2,存放yaffs2文件系统,可以大一些:
Command (m for help): n Partition type: p primary (1 primary, 0 extended, 3 free) e extended Select (default p): p Partition number (1-4, default 2): 2 First sector (2048-15564799, default 2048): 106780
这的起始地址选part1的结束的地址+1就可以了,即:106779+1.我的SD卡是8G的,所以我给他分配了2G 这个可以自己分配 然后输入p: Disk /dev/mmcblk0: 7969 MB, 7969177600 bytes 4 heads, 16 sectors/track, 243200 cylinders, total 15564800 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/mmcblk0p1 4380 106779 51200 83 Linux /dev/mmcblk0p2 106780 4301083 2097152 83 Linux 最后输入w,完成分配 Command (m for help): w 分区完的SD是没有格式的,我们需要将他格式化为FAT32,因为我们的uboot支持这个格式
mkfs.vfat 3.0.14 (23 Jan 2023)
mkfs.vfat 3.0.14 (23 Jan 2023)
加入你的系统支持自动挂载,此时sd的分区就会被挂.接下来烧入uboot, sudo dd iflag=dsync oflag=dsync if=webee210-uboot.bin of=/dev/mmcblk0 seek=1 将你的uImage拷贝到分区1/dev/mmcblk0p1,yaffs2 到分区2//dev/mmcblk0p2 这样前期准备工作完成,接下来只需要通过uboot的SD下载模式烧到nand flash即可!