s3c2410 mmc errata?

Harald Welte laforge at openmoko.org
Sat Jun 2 18:33:51 CEST 2007

On Fri, Jun 01, 2007 at 08:41:54AM +0200, Pierre Ossman wrote:
> Does anyone have an errata for this patch?
> https://svn.openmoko.org/trunk/src/target/kernel/patches/s3cmci_dbg.patch

it's actually one of the bugs documented in the user manual..
unfortunately in slightly clumsy english, as [unfortunately] often with

Page 19-3 (pdf page 444) of S3C2410X User Manual Rev. 1.2:

2. In MMC write mode, the CRC error is occurred in spite of correct
writing. If user wants to transmit data reliably, read the data and
compare it after writing.

3. In case of long response, the CRC error should be detected after
receiving exact response data from SD device. User should check the CRC
of received response by software.

So the proper fix would be to actually do software CRC, rather than
completely ignore.

- Harald Welte <laforge at openmoko.org>          	        http://openmoko.org/
Software for the world's first truly open Free Software mobile phone

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