From: Thomas Gleixner <tglx@linutronix.de>
To: Charles Manning <manningc2@actrix.gen.nz>
Cc: William Watson <wjw1961@gmail.com>,
linux-mtd@lists.infradead.org, yaffs@stoneboat.aleph1.co.uk
Subject: Re: [Yaffs] bit error rates --> a vendor speaks
Date: Sat, 18 Feb 2006 10:10:25 +0100 [thread overview]
Message-ID: <1140253826.2480.651.camel@localhost.localdomain> (raw)
In-Reply-To: <200602161432.17447.manningc2@actrix.gen.nz>
Charles,
On Thu, 2006-02-16 at 14:32 +1300, Charles Manning wrote:
> 1) ECC on tags.... Tags are so small that a single-bit correction is probably
> enough. Multibit is probably a good thing to investigate.
> 2) More OOB being used for multi-bit schemes will probably mean less space
> available for tags.
We really should start to think seriously about oob usage for arbitrary
data storage at all. I know that YAFFS(2) depends on that, but looking
at the required mess in the code to keep this up for all the 9999
variants of ECC/RS whatever mechanisms, bad block marking schemes ...
Some words about Reed Solomon.
Reed Solomon needs hardware support for performance reasons. Efficient
usage of Reed Solomon requires a different Data / RS-code layout:
512 Byte Data
8 Byte RS Code
512 Byte Data
8 Byte RS Code
512 Byte Data
8 Byte RS Code
512 Byte Data
8 Byte RS Code
32 Byte OOB
This layout is supported already (see rtc_from4.c). It requires usage of
flash based bad block tables.
tglx
next prev parent reply other threads:[~2006-02-18 9:09 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <43EB96DC.3030900@eptar.com>
[not found] ` <35fb2e590602100558s2d868fa3o1752fbf3217439e4@mail.gmail.com>
[not found] ` <d97046180602151153g23064424x9e1ddf83a1d7ae4f@mail.gmail.com>
2006-02-16 1:32 ` [Yaffs] bit error rates --> a vendor speaks Charles Manning
2006-02-18 9:10 ` Thomas Gleixner [this message]
2006-02-18 16:31 ` Vitaly Wool
2006-02-19 8:22 ` Thomas Gleixner
2006-02-20 20:42 ` Charles Manning
2006-02-20 21:37 ` Thomas Gleixner
2006-02-20 22:40 ` Charles Manning
2006-02-20 23:18 ` Thomas Gleixner
2006-02-21 0:29 ` Jon Masters
2006-02-21 8:26 ` Thomas Gleixner
2006-02-21 9:35 ` Jörn Engel
2006-02-21 1:08 ` [Yaffs] bit error rates --> YAFFS for devices with no OOB Charles Manning
2006-02-21 2:12 ` Jon Masters
2006-02-22 0:38 ` Jamie Lokier
2006-02-21 12:14 ` [Yaffs] bit error rates --> a vendor speaks Artem B. Bityutskiy
2006-02-21 13:50 ` Josh Boyer
2006-02-21 14:36 ` Artem B. Bityutskiy
2006-02-21 14:49 ` Artem B. Bityutskiy
2006-02-21 11:59 ` Artem B. Bityutskiy
2006-02-21 12:06 ` Thomas Gleixner
2006-02-25 11:58 ` Artem B. Bityutskiy
2006-02-27 13:27 ` Josh Boyer
2006-02-27 16:01 ` Artem B. Bityutskiy
2006-02-27 16:15 ` Josh Boyer
2006-02-27 17:21 ` Artem B. Bityutskiy
2006-02-27 17:40 ` Josh Boyer
2006-02-18 18:11 ` Russ Dill
2006-02-19 0:29 ` Charles Manning
2006-02-19 5:08 ` Jon Masters
2006-02-19 8:29 ` Thomas Gleixner
2006-02-23 0:46 ` Russ Dill
2006-02-23 7:36 ` Thomas Gleixner
2006-02-23 8:31 ` Vitaly Wool
2006-02-24 9:51 ` Artem B. Bityutskiy
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