Sibley and wbuf fixups
Jörn Engel
joern at wohnheim.fh-wedel.de
Mon Apr 24 11:07:41 EDT 2006
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
--
Happiness isn't having what you want, it's wanting what you have.
-- unknown
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