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From: Esben Haabendal <eha@dev.doredevelopment.dk>
To: Sascha Hauer <s.hauer@pengutronix.de>
Cc: barebox@lists.infradead.org
Subject: Re: UBI support
Date: Fri, 16 Jul 2010 14:13:39 +0200	[thread overview]
Message-ID: <1279282419.4732.4.camel@eha.doredevelopment.dk> (raw)
In-Reply-To: <20100716072702.GJ14113@pengutronix.de>

On Fri, 2010-07-16 at 09:27 +0200, Sascha Hauer wrote:

> > 
> > I've tested this on our i.MX25 board. Here's what I get:
> > 
> > barebox:/ ubiattach /dev/nand0.rootfs
> > UBI: attaching mtd0 to ubi0
> > UBI: physical eraseblock size:   131072 bytes (128 KiB)
> > UBI: logical eraseblock size:    129024 bytes
> > UBI: smallest flash I/O unit:    2048
> > UBI: sub-page size:              512
> > UBI: VID header offset:          512 (aligned 512)
> > UBI: data offset:                2048
> > UBI: empty MTD device detected
> > UBI: create volume table (copy #1)
> > UBI error: ubi_scan_get_free_peb: no eraseblocks found
> > failed to attach: error 28
> 
> I just tested it on an i.MX35 board which should have the same Nand
> Controller as the i.MX25. I have never seen Nand devices with a subpage
> size smaller than the I/O unit size (sub-page size: 512), so I would
> start looking there.
> I don't know how this subpage size is handled. It may well be that this
> is a bug in the Nand driver and not UBI.
> You could also go through 'git log drivers/mtd/ubi' in the kernel to see
> if there's something relevant. Unfortunately I don't know from which
> kernel version the U-Boot UBI code was derived from.

FWIW, I am working on a device here with a similar NAND device.
To get it working properly, you must not enable
CONFIG_MTD_NAND_VERIFY_WRITE (as it is known to be broken for sub-page
size != I/O unit size).  I haven't looked at barebox nand or ubi driver,
so I have no idea if something similar to this could be present there.

/Esben


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      parent reply	other threads:[~2010-07-16 12:21 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-05 13:16 Sascha Hauer
2010-07-05 13:16 ` [PATCH 01/12] crc32: activate crc32_no_comp (needed for jffs2 and UBI) Sascha Hauer
2010-07-05 13:16 ` [PATCH 02/12] move drivers/nand to drivers/mtd/nand Sascha Hauer
2010-07-05 13:16 ` [PATCH 03/12] add rbtree support (needed for ubi) Sascha Hauer
2010-07-05 13:16 ` [PATCH 04/12] add partition mtd support Sascha Hauer
2010-07-05 13:16 ` [PATCH 05/12] cfi_flash: Do not typedef struct flash_info Sascha Hauer
2010-07-05 13:16 ` [PATCH 06/12] cfi_flash: Do not print debug info while erasing Sascha Hauer
2010-07-05 13:16 ` [PATCH 07/12] cfi_flash: Add mtd partition support for UBI Sascha Hauer
2010-07-05 13:16 ` [PATCH 08/12] devfs: only check for ioctl function when needed Sascha Hauer
2010-07-05 13:16 ` [PATCH 09/12] include stuff missing for ubi Sascha Hauer
2010-07-05 13:16 ` [PATCH 10/12] add ubi support from u-boot. Just enough to compile and scan Sascha Hauer
2010-07-05 13:16 ` [PATCH 11/12] barebox ubi changes Sascha Hauer
2010-07-05 13:16 ` [PATCH 12/12] Add UBI commands: ubiattach, ubidetach, ubimkvol, ubirmvol Sascha Hauer
2010-07-05 15:22 ` [PATCH 02/12] move drivers/nand to drivers/mtd/nand Alessandro Rubini
2010-07-06  6:31   ` Sascha Hauer
2010-07-08  9:19 ` UBI support Baruch Siach
2010-07-16  7:27   ` Sascha Hauer
2010-07-16  8:57     ` Eric Bénard
2010-07-16 12:13     ` Esben Haabendal [this message]

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