File system transplantation (IV): cramfs file system transplantation

Kernel version: linux-3.0

u-boot version: u-boot-2010.09

Development board model: FL2440

1. Modify the root file system

      No modification

2. Add kernel support for cramfs

       [lingyun@localhost linux-3.0]$ vt100

       [lingyun@localhost linux-3.0]$ make menuconfig

      File systems --->

           Miscellaneous filesystems --->

                <*> Compressed ROM file system support (cramfs)

     Modify Makefile

     [lingyun@localhost linux-3.0]$ vim Makefile

     Modify lines 195 and 196

     [lingyun@localhost linux-3.0]$ make

     Compilation process omitted

     [lingyun@localhost linux-3.0]$ ls

     Displaying directory results is the same as Transplant (I).

     ky-cramfs.bin is the compiled kernel.

3. Make an image file

     [lingyun@localhost keyue]$ mkcramfs rootfs_tree ky-rootfs.cramfs

     Copy the image file to tftp.

     [lingyun@localhost keyue]$ cp ky-rootfs.cramfs /tftp/

4. Burn the file system into the development board

      4.1. Set startup parameters

       [u-boot@keyue]# set bcramfs 'tftp 30800000 ky-rootfs.cramfs;nand erase f00000 600000;nand write 30800000 f00000 600000'

       [u-boot@keyue]# set bootargs 'noinitrd root=/dev/mtdblock3 rootfstype=cramfs init=/linuxrc console=ttyS0,115200'

       [u-boot@keyue]# set bootcmd_cramfs 'nand read 30008000 100000 400000;bootm 30008000'

      [u-boot@keyue]# set bootcmd 'run bootcmd_cramfs'

      [u-boot@keyue]#set bkr 'tftp 30008000 ky-cramfs.bin;nand erase 100000 800000;nand write 30008000 100000 800000'

      [u-boot@keyue]# save

       Parameters were set successfully.

      4.2. Burn the file system and kernel into the development board

        [u-boot@keyue]# run bkr

        The operation process is omitted.

        [u-boot@keyue]# run bcramfs

        The operation process is omitted.

        [u-boot@keyue]# boot

        The burning process is omitted, and the results are as follows:

       At this point, the file system has been burned into the development board, and you can see the file system you made.