Re: UBI and OneNAND

[Artem Bityutskiy <dedekind@infradead.org>]

On Tue, 2006-11-07 at 02:35 +0000, 박경민 wrote:
> It is my sequence.
> 
> # mkdir -p /mnt
> # insmod ubi.ko mtd=3
> 
> UBI: attached mtd3 to ubi0
> UBI: MTD device name:            "rootfs"
> UBI: MTD device size:            16 MB
> UBI: physical eraseblock size:   131072 bytes (128 KB)
> UBI: logical eraseblock size:    126976 bytes
> UBI: number of good PEBs:        127
> UBI: number of bad PEBs:         1
> UBI: smallest flash I/O unit:    2048
> UBI: VID header offset:          2048 (aligned 2048)
> UBI: data offset:                4096
> UBI: max. allowed volumes:       124
> UBI: wear-levelling threshold:   4096
> UBI: number of internal volumes: 2
> UBI: number of user volumes:     0
> UBI: available PEBs:             122
> UBI: total number of reserved PEBs: 5
> UBI: number of PEBs reserved for bad PEB handling: 1
> 
> # mount -t jffs2 /dev/mtdblock3 /mnt
This is incorrect. MTD3 now belongs to UBI only. Do not try to do
anything with it. You can only create UBI volumes now, and mount the
_volumes_!

> 
> / # mount -t jffs2 /dev/mtdblock3 /tmp
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000000: 0x4255 id
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000004: 0x0001 id
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000003c: 0xcedc id
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000800: 0x4255 id
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000804: 0x0101 id
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000808: 0xff7f id
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000083c: 0x25b8 id
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x000010a8: 0x16f1 id
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00001154: 0x16f1 id
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00001200: 0x16f1 id
> ...
> Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes
> empty_blocks 0, bad_blocks 1, c->nr_blocks 128
> mount: Mounting /dev/mtdblock3 on /tmp failed: Input/output error
Of course it is expected. UBI writes its headers to MTD3 and you try to
feed it to JFFS2. Do not do this.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)