[maemo-developers] [maemo-developers] MMC - multiblock writes

From: Frantisek Dufka dufkaf at seznam.cz
Date: Mon Oct 30 09:50:24 EET 2006

since reading from MMC is fast now but writing is slow (300KB/s) I tried 
  to enable multiblock writes [0] and is seems to not to crash 
immediatelly. In fact it seems it is working :-) I'm not sure multiblock 
writes are safe on OMAP 1710. I asked Juha who seems to have some 
success with unspecified OMAP chip here [1] but got no answer.

Anyway the kernel is here http://fanoush.webpark.cz/maemo/#mmcplus below 
the high-speed one. Again I have not tested this specific kernel since I 
have it compiled with MMC drivers as modules but it works for me for few 

It would be nice to have some info from Nokia whether OMAP 1710 really 
should support multiblock writes safely (host driver returns the number 
of bytes successfully transferred to the card prior to a bus error
occuring during the data phase). And another thing of course is if the 
omap mmc driver have no bugs regarding multiblock writes since so far it 
was not enabled in MMC block layer at all.


[0] http://www.spinics.net/lists/arm-kernel/msg35748.html
[1] http://www.spinics.net/lists/arm-kernel/msg35999.html

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