Questions regarding JFFS2/NAND
jwboyer at gmail.com
Mon Sep 25 06:50:25 EDT 2006
On 9/25/06, Ajay Jain <ajain at neomagic.com> wrote:
> 1. Is it possible to run JFFS2 on NAND Flash on 2.4. I am seeing that
> the mtd website mentions that it is not supported. I do not clearly
> understand what it means. Does it mean that mtd guys do not support it,
> or does it mean that you can't run JFFS2 on nand in 2.4 at all.
The latter. Unless you attempt to backport the code from 2.6. And
that is definitely unsupported.
> 3. Because of this, we backported 'mtd' from 2.6 version. Now the mtd
> appears to be reasonably stable. But we still have the old jffs2 in
> place. The new mtd does not allow unaligned writes, but jffs2 (the old
> one) keeps sending unaligned requests. We modified the mtd layer to
> handle this, but then the issue is that we are writing to the same page
> again and again, as the writes are unaligned. But the ecc value can only
> be written once. So this solution will not work either. It does work if
> we switch off the ecc. Are you aware of any of these issues, is my
> observation correct.
You would need newer JFFS2.
> 4. Is it realistically possible to backport 2.6 JFFS2 to 2.4.
No, not really.
> Please help me to solve these issues. We want to run JFFS2 on 2.4/NAND.
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