From: Alexandre Gambier <a.gambier@ftemaximal.fr>
To: dedekind1@gmail.com
Cc: linux-mtd@lists.infradead.org
Subject: Re: ubi_eba_init_scan: cannot reserve enough PEBs for bad PEB handling
Date: Wed, 11 Jan 2012 09:10:45 +0100 [thread overview]
Message-ID: <4F0D4405.2060800@ftemaximal.fr> (raw)
In-Reply-To: <1326230599.2335.4.camel@koala>
>> hi everyone,
>>
>> I use UBI volume and UBIFS on top of a NAND device with an embedded
>> video meter.
>> Everything works fine except that when a UBI volume is mounted the
>> following warning is outputted :
>> "UBI warning: ubi_eba_init_scan: cannot reserve enough PEBs for bad PEB
>> handling, reserved 0, need 20"
> Looks like the pool of reserved PEBs is fully used. Fo how long have you
> been using this flash?
This is a brand new flash...I've been using it for 2 months.
>
>> UBI: attaching mtd7 to ubi0
> When I see things like mtd7 - I get worried. Do you have 7 partitions on
> one chip? Even on old good and reliable chips this was not very good
> idea, let alone modern NANDs with all these unstable bits, "radiation"
> effects, low eraseblock max. erase count, etc...
Here is my partition table
mtd0 -> UBoot -> 1 MiB
mtd1 -> UBootSettings -> 128 KiB
mtd2 -> SafeKernel -> 4 MiB => The linux kernel loaded in safe mode
to restore the main rootfs and perform maintenance.
mtd3 -> AppKernel -> 4 MiB => The linux kernel loaded in normal mode
when running the application.
mtd4 -> SafeFS => 64 MiB => The safe mode file-system.
mtd5 -> AppFS => 128 MiB => The main application file-system.
mtd6 -> Reserved => 54.875 MiB => Reserved during the development
stage, will be used in stable version.
mtd7 -> UserData => 256 MiB => User's data partition to store records
and log files (that will never be erased or formatted).
> BTW, be aware of this problem:
>
> http://linux-mtd.infradead.org/doc/ubifs.html#L_unstable_bits
thanks..The user's data partition will be the only one mounted in r/w
mode...files in it are not crucial.
> which has not been solved - we need a brave knight who'd spend time
> working on this issue.
A little bit to complicated for me otherwise I would love to help the
MTD project.
Alex
next prev parent reply other threads:[~2012-01-11 8:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-10 12:46 ubi_eba_init_scan: cannot reserve enough PEBs for bad PEB handling Alexandre Gambier
2012-01-10 21:23 ` Artem Bityutskiy
2012-01-11 8:10 ` Alexandre Gambier [this message]
2012-01-14 15:14 ` Artem Bityutskiy
2012-01-16 8:47 ` Alexandre Gambier
2012-01-16 12:24 ` Artem Bityutskiy
2012-01-16 12:28 ` Alexandre Gambier
2012-01-16 12:31 ` Artem Bityutskiy
2012-01-16 16:11 ` Alexandre Gambier
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