Re: SD card multiblock read/writes ??

[Pierre Ossman <drzeus@xxxxxxxxx>]

David Brownell wrote:
> On Friday 25 August 2006 1:24 pm, Jeff Hane wrote:
> 
>>   So am curious to know why multiblock writes are not enable.
> 
> ISTR because one of the early MMC implementations, for pxa250,
> has execrable fault reporting which prevents reporting how
> many blocks were actually transferred after a fault.
> 
> You didn't say what platform you're using, but I thought some
> of them _do_ support multiblock writes.
> 

If you look closer at it, the problem is deeper than that. The cards can
themselves do pipelining of an unknown number of blocks. And since the
block layer users assume they can get precise information about where
things went wrong, we're SOL.

Rgds
Pierre

Attachment: signature.asc
Description: OpenPGP digital signature

-------------------------------------------------------------------
List admin: http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm-kernel
FAQ:        http://www.arm.linux.org.uk/mailinglists/faq.php
Etiquette:  http://www.arm.linux.org.uk/mailinglists/etiquette.php