Re: 2GB MMC/SD cards

Richard Purdie
2006-06-06T07:21:43Z

On Mon, 2006-06-05 at 16:29 -0600, Jordan Crouse wrote:
> I'm not 100% sure what the community stance is on using the simplified specs.
> I do believe the answer lies definitively within, but I'll refrain from
> quoting it to avoid any legal complaints. For the longest time, my gut
> feeling has been that 512 byte writes were always accepted - but since all of
> our 2G and 4G cards support WRITE_BL_PARTIAL, we haven't had a chance to
> prove the argument one way or the other.
>
> We first heard about very large card issues from one of our customers, and
> we haven't heard any more problems since we gave them a patch to force the
> sector size on all SD/MMC cards to 512 bytes. Thats just anecdotal evidence,
> but it is food for thought.

For what its worth this is the feeling I get from the users of the
Zaurus kernels as well. For the PXA driver, there is the added
complication that it doesn't support block sizes > 1023 but I've had no
complaints since I limited it to 512.

Richard