[U-Boot] [PATCH/RFC] drivers/mmc/mmc.c: change the controller frequency before the card frequency

Jean-Christophe PLAGNIOL-VILLARD plagnioj at jcrosoft.com
Thu Aug 20 01:42:04 CEST 2009


On 14:16 Wed 19 Aug     , Albin Tonnerre wrote:
> While rewriting the atmel_mci driver to use the new MMC_GENERIC API (and allow
> the use of SD/MMC on AT91 in the process), it appeared that switching the card
> frequency before the controller frequency resulted in the answer from the card
> never being received. Changing the controller frequency before the controller
> frequency fixes that.
IIRC it's not correct you are supposed to switch the card to higherfreq and
then the bus speed

could show the patch of the atmel_mci to help

Best Regards,
J.


More information about the U-Boot mailing list