From: Matthieu CASTET <matthieu.castet@parrot.com>
To: Iwo Mergler <iwo@call-direct.com.au>
Cc: dwmw2@infradead.org, joern@logfs.org,
linux-mtd@lists.infradead.org,
Alexey Korolev <akorolev@infradead.org>
Subject: Re: [BUG] JFFS2 power loss recovery issues on NAND
Date: Tue, 17 Jun 2008 10:13:06 +0200 [thread overview]
Message-ID: <48577212.9070004@parrot.com> (raw)
In-Reply-To: <48570D5A.1050906@call-direct.com.au>
Iwo Mergler wrote:
> Alexey Korolev wrote:
>>
> Alexey,
>
> I know of at least one hardware ECC implementation which can flag
> errors within the ECC bytes separately. In other words, not all
> implementations
> will detect/correct bit errors in the case of a ECC write error.
>
> About how to fix it - what about making the reading without ECC the default
> and only re-reading with ECC if JFFS2 finds an invalid checksum?
>
But what happen if a but flip happen ?
If we do this, ecc won't correct it, the error can happen everywhere not
only in checksum, for example wrong nodetype.
If only we could put a marker after the ecc data, we could detect such
case. But linux put ecc at the end of oob.
Matthieu
next prev parent reply other threads:[~2008-06-17 8:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-10 13:57 [BUG] JFFS2 power loss recovery issues on NAND Alexey Korolev
2008-06-17 1:03 ` Iwo Mergler
2008-06-17 8:13 ` Matthieu CASTET [this message]
2008-06-17 9:24 ` Jörn Engel
2008-06-17 16:00 ` Alexey Korolev
2008-06-17 16:57 ` Jörn Engel
2008-06-17 23:51 ` Iwo Mergler
2008-06-18 12:19 ` Jamie Lokier
2008-06-18 12:33 ` David Woodhouse
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