Sibley and wbuf fixups

[Jörn Engel]

On Mon, 24 April 2006 09:43:05 -0400, Nicolas Pitre wrote:
> 
> Sibley has two write modes.  "object" and "control" modes if I remember 
> the names correctly.  The mode that behaves like traditional NOR may 
> only use half the flash size since 16 out of 32 flash words are then 
> unusable (16 writable words are followed by 16 unusable words and so 
> on).
> 
> The other mode can use the full flash size but it must write a full 1KB 
> block at once and it can be written only once.  To be able to write 
> again you must erase the whole flash sector.
> 
> Therefore JFFS2 on Sibley currently uses the 1KB block write mode with 
> the help of CONFIG_JFFS2_FS_WRITEBUFFER.  This also means, 
> unfortunately, that the JFFS2 clean marker must waste a whole 1KB block 
> per erase sector.

Very interesting.  Thank you for the explanation.

Jörn

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