Messages in this thread |  | | | Subject | Re: [PATCH] mmc: Reduce fOD to 200 kHz if possible | | From | Ben Nizette <> | | Date | Wed, 15 Sep 2010 19:50:08 +1000 |
| |
On 15/09/2010, at 6:59 PM, Haavard Skinnemoen wrote:
> Since the identification frequency was increased to 400 kHz, my > ATSTK1000 board has not been able to initialize any MMC or SD cards. > Reducing the identification mode frequency to 200 kHz fixes the problem. > > This is definitely a board-specific issue, probably due to weak pull-up > resistor values, but this is the simplest fix I could come up with.
I wonder whether there's an Atmel reference schematic around with an incorrect resistor value on it, the only three people I know affected by this are myself, Hein Tibosch and you, all on AVR32. We've now submitted one fix each, mine was similar to yours [1] but there's been movement on Hein's more comprehensive patch recently [2]. I don't know who's supposed to be merging MMC patches atm, Chris Ball added on CC on a hunch.
--Ben.
[1] http://lkml.org/lkml/2010/1/1/85 [2] http://lkml.org/lkml/2010/9/2/494
|  |