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Date: Thu, 15 Sep 2005 11:48:30 +0400
From: "Artem B. Bityuckiy" <dedekind@yandex.ru>
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To: Peter Menzebach <pm-mtd@mw-itcon.de>
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Cc: linux-mtd@lists.infradead.org
Subject: Re: data  loss on jffs2 filesystem on dataflash
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Peter Menzebach wrote:

[snip]
 > [42949498.320000] PM: dataflash_write: 1022208 .. 1030656
[snip]
> [42949495.640000] jffs2_write_dnode wrote node at 0x0000e770(2) with 
> dsize 0x4, csize 0x4, node_crc 0x33de5e85, data_crc 0x56bc8289, totlen 
> 0x00000048
JFFS2 writes a node at offset 0x0000e770.

[snip]
> [42949518.470000] PM: dataflash_write: 1022208 .. 1030656
[snip]
> [42949515.170000] Obsoleting node at 0x0000e770 of len 0x48: <7>Wasting
After the second echo, it obsolets the old data node.

[snip]
> [42949515.190000] jffs2_write_dnode wrote node at 0x0000e7fc(2) with 
> dsize 0x4, csize 0x4, node_crc 0x8f17e80f, data_crc 0x56bc8289, totlen 
> 0x00000048
And writes the new node at 0x0000e7fc

But your messages show that the write goes to the same place.

May be (guessing):
1. Your messages are invalid?
2. Something goes on with JFFS2 wbuf and it is committed to the same 
page (unlikely)?
3. Your flash driver is incorrect?

-- 
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.