On Saturday 19 November 2011 12:36:00 Stephen Warren wrote: > On 01/-10/-28163 12:59 PM, Macpaul Lin wrote: > > This reverts commit 02f3029f1810b99869254d0cf0a71946a008a728. > > > > This patch add 3 times retry to CMD8 because the Marvell mmc controller > > doesn't obey the power ramp up process in the SD specification 6.4.1. > > (Please refer to figure 6.1 and 6.2 in the specification.) > > > > The CMD0 should be send after power ramp up has been finished. > > However, the Marvell mmc contorller must do power ramp up after the > > first CMD0 command has been send. > > > > This patch also affect existing platforms like Nokia N900 and other > > platforms. > > > > Signed-off-by: Macpaul Lin <macp...@andestech.com> > > Acked-by: Lei Wen <lei...@marvell.com> > > Acked-by: Stephen Warren <swar...@nvidia.com> > Tested-by: Stephen Warren <swar...@nvidia.com> > > As background, I'm working on patches to support the Toshiba AC100 / > Dynabook AZ in mainline U-Boot. The internal MMC didn't work at all > until this revert was applied. The SD slot worked perfectly though. I > guess this is related to the MMC itself not supporting this > (SD-specific?) command, and the patch caused MMC mode never to be attempted.
Same for Nokia N900 (SD slot working fine). After reverting commit 02f3029f1810b99869254d0cf0a71946a008a728 internal eMMC working too. -- Pali Rohár pali.ro...@gmail.com
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