From: "David Lanzendörfer" <david.lanzendoerfer@o2s.ch>
To: David Brown <davidb@codeaurora.org>, linux-arm-msm@vger.kernel.org
Subject: Re: MSM NAND - Subpage size reading
Date: Tue, 1 Jun 2010 22:05:39 +0200 [thread overview]
Message-ID: <201006012205.47125.david.lanzendoerfer@o2s.ch> (raw)
In-Reply-To: <20100601165758.GB610@huya.qualcomm.com>
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>> [...]
>The NAND controller on the MSM has limited support for subpage
>operations. The problem is that it does ECC across the entire
>page data. This is necessary in order to support MLC NAND
>devices.
Hmm. Ok.
>Is the requirement to do subpage read, or subpage writing?
Subpage writing and reading in order to perform ubiformat operations.
>Subpage writing is not possible on MLC NAND (it isn't even
>permitted to overwrite data to zero things out). Depending on
>which data is needed, subpage reading could be done, but would
>transfer at least 1/4 of the page anyway.
Thats bad. But it seems we need to take it, in order to get ubifs working on this device.
>David
dito ;-)
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next prev parent reply other threads:[~2010-06-01 20:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-30 16:42 MSM NAND - Subpage size reading David Lanzendörfer
2010-06-01 16:57 ` David Brown
2010-06-01 20:05 ` David Lanzendörfer [this message]
2010-06-14 15:58 ` David Lanzendörfer
2010-06-14 17:08 ` David Brown
2010-06-15 21:33 ` David Lanzendörfer
2010-06-17 12:24 ` David Lanzendörfer
2010-06-18 16:46 ` David Lanzendörfer
-- strict thread matches above, loose matches on Subject: below --
2010-05-30 16:48 David Lanzendörfer
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