From: Artem Bityutskiy <dedekind1@gmail.com>
To: Caglar Akyuz <caglarakyuz@gmail.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>,
David Brownell <dbrownell@users.sourceforge.net>,
linux-mtd@lists.infradead.org
Subject: Re: UBI Errors on DaVinci OMAP L-138/DA850
Date: Thu, 29 Apr 2010 08:25:41 +0300 [thread overview]
Message-ID: <1272518741.7750.65.camel@localhost> (raw)
In-Reply-To: <201004210115.18664.caglarakyuz@gmail.com>
On Wed, 2010-04-21 at 01:15 +0300, Caglar Akyuz wrote:
> Hello,
>
> Today I made my first attempt to try ubifs on a DaVinci processor, OMAP
> L-138 or DA850 specifically. My board has a Micron SLC 128 MiB NAND chip with
> part number MT29F1G08ABCHC(chip id is 0xa1)
>
> I formatted and flashed my partition with commands:
>
> $ubiformat /dev/mtd4
> $ubiformat /dev/mtd4 -f rootfs.ubi
>
> Then I tried to attach it with:
>
> $ubiattach /dev/ubi_ctrl -m 4
>
> However, I hit the FAQ entry at [1], namely driver returning -EBADMSG. Then I
> tried to mount an empty flash with following commands in case my image has
> something wrong:
>
> $ubiformat /dev/mtd4
> $ubiattach /dev/ubi_ctrl -m 4
> $ubimkvol /dev/ubi0 -N filesytem -s 100MiB
> $mount -t ubifs /dev/ubi0_0 /mnt/cf
>
> But this resulted the same error message when I read/write something to/from the
> flash. (To be honest I do not remember if the error was due to read, write or remount)
>
> Then I tried formating and attaching my partition with '-s 2048' and -O '2048'
> parameters respectively and -EBADMSG error went away. So I patched
> nand_ids.c to add 'NAND_NO_SUBPAGE_WRITE' option to my NAND flash
> (patch is attached) and after this operation I was able to use ubifs as expected
> on my board.(Of course re-building my ubi image with new nand parameters)
>
> I wonder:
>
> * if this modification has any side effects?
Probably sub-pages are not supported with this change?
> * Is this error due to my NAND flash or DaVinci driver is doing something wrong?
> Unfortunately, Micron datasheet is not publically available and I cannot check if it
> is supporting 512 KiB sub-page operations or not.
Most probably the flash does support sub-pages because of HW ECC
support. I do not know DaVinchi platform at all, but I guess what you
need to do is to set NAND_NO_SUBPAGE_WRITE in chip options in your
platform data. But it is better to talk to DaVinchi guys (CCed some).
--
Best Regards,
Artem Bityutskiy (Артём Битюцкий)
prev parent reply other threads:[~2010-04-29 5:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-20 22:15 UBI Errors on DaVinci OMAP L-138/DA850 Caglar Akyuz
2010-04-29 5:25 ` Artem Bityutskiy [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1272518741.7750.65.camel@localhost \
--to=dedekind1@gmail.com \
--cc=caglarakyuz@gmail.com \
--cc=dbrownell@users.sourceforge.net \
--cc=khilman@deeprootsystems.com \
--cc=linux-mtd@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).