[yocto] System recovery

[Enrico Bonomi]

Hi,

I work with Yocto Poky 1.7.3 on an imx6 dual lite SOM. I recently came
across a problem with a preexisting system. Infact in a couple of cases,
after about one year of work with no problems, file system results
corrupted and the machine can't work. So i decide to implement a recovery
system that can intervene in theese cases. An sd card is mounted on my
board, so i think that i can use it to act this process. Using gparted i
create a partition on sd card that can store my recovery file system.
This partition starts at block 1581056 (so 0x00182000), every block has a
size of 512 bytes and the file system size is 370262016 bytes (so
0x1611c000) that are 723168 blocks (so 0x000b08e0).
In the u-boot i do the following instructions:

nand erase.part rootfs
ubi part rootfs
ubi create rootfs
mmc dev 0
mmc read 12000000 0x00182000  0x000b08e0
ubi write 12000000 rootfs 0x1611c000
ubifsmount ubi0:rootfs

and this instruction results in the following errors:

UBIFS error (pid 0): ubifs_read_node: bad node type (0 but expected 6)
UBIFS error (pid 0): ubifs_read_node: bad node at LEB 0:0
UBIFS error (pid 0): ubifs_mount: Error reading superblock on volume
'ubi0:rootfs' errno=-22!

ubifsmount - mount UBIFS volume

Usage:
ubifsmount <volume-name>
   - mount 'volume-name' volume

the strange thing is that when i first program all new devices i use the
following instruction:

tftpboot prall

and prall is the compiled of a txt file which, when programming file system
use the same instructions, obviously except for

tftp 12000000 rootfs.ubifs

instead of my mmc instructions, and

ubi write 12000000 rootfs ${filesize}

but from what i understand the "filesize" variable is set from the tftp
instruction

Where do i fail?

Thanks

Enrico
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