block2mtd and ubi

[Lluís Batlle i Rossell]

On Sat, Nov 20, 2010 at 06:58:56PM +0100, Lluís Batlle i Rossell wrote:
> Hello,
> 
> I'm trying to use the qemu mipsel malta board to boot an ubifs image, prepared
> with 'ubinize', and using block2mtd on /dev/hda, where qemu receives the image
> through -hda ubifs.img.
> 
> The problem I have summarizes in this UBI complain while booting:
> block2mtd: mtd0: [/dev/hda] erase_size = 512KiB [524288]
> UBI: attaching mtd0 to ubi0
> UBI: physical eraseblock size:   524288 bytes (512 KiB)
> UBI: logical eraseblock size:    524160 bytes
> UBI: smallest flash I/O unit:    1
> UBI: VID header offset:          64 (aligned 64)
> UBI: data offset:                128
> UBI warning: check_what_we_have: 1008 PEBs are corrupted
> corrupted PEBs are: 0 1 2 3 4 5 6 7 .....
> UBI error: check_what_we_have: too many corrupted PEBs, refusing this device
> UBI error: ubi_init: cannot attach mtd0
Solved!

The first PEBs were corrupt because I was using 'dd' wrong. Nevertheless,
filling the rest of image with zeros gave corrupt PEBs on the rest. joer on #mtd
(oftc irc) helped me suggesting maybe 0xff would work. And appending 0xff
instead of 0x00 worked great.

It's a pity that the same 'ubinize' cannot do that job automatically, and give
an image filling all the memory blocks. That would easy down a lot the job for
block2mtd.

Regards,
Lluís.