Questions regarding JFFS2/NAND
ajain at neomagic.com
Mon Sep 25 05:11:30 EDT 2006
I have a few questions. Please help me to answer them, if you find
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.
2. On version 2.4.21, we see that 'ecc' is always disabled. It does not
really matter, as what value we set. Is anybody you aware of this issue.
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
4. Is it realistically possible to backport 2.6 JFFS2 to 2.4.
Please help me to solve these issues. We want to run JFFS2 on 2.4/NAND.
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