On Fri, Apr 23, 2010 at 6:21 PM, Albin Tonnerre <albin.tonne...@free-electrons.com> wrote: > On Fri, 23 Apr 2010 16:58 -0500, Andy Fleming wrote : >> On Thu, Apr 22, 2010 at 7:51 PM, Rob Emanuele <r...@emanuele.us> wrote: >> > Hi Henry & U-Boot Community, >> > >> > I've been experiencing the same errors and frustration you have. >> > >> > So I've been looking at this code and these patch sets for a day or >> > two now. I've done that in conjunction with reading the SD card spec: >> > http://www.sdcard.org/developers/tech/sdcard/pls/ >> > >> > I've come to the conclusion that this code as it stands will not work >> > with any card that conforms to the SD Physical Layer Simplified >> > Specification Version 2.0. This includes all SDHC cards and some >> > non-HC cards that conform to version 2.0. I have a few 1GB cards that >> > work just fine with the atmel_mci.c code on a 'G45 as it was in rev >> > 95c44ec485b46ffb43dbdaa299f1491a500fdadf . >> > >> > If your SD card is newer, you'll see in the for loop in "sd_init_card" >> > in atmel_mci.c time out. In the 2.0 spec, you need to perform a CMD8 >> > (SEND_IF_COND) first to see if your card is a 2.0 card. In CMD8 you >> > tell the card the voltages you support and if you support HC cards. >> > Once you send it the right data there, then ACMD41 will not have its >> > BUSY bit set. That's all well and good, but additionally the CSD >> > register is in a new format and that needs updating before any of this >> > will work. >> >> >> The best solution is to use the MMC framework, which *does* do all of >> these things that you suggest. It should be fairly straightforward to >> port the atmel_mci driver to this framework. If you see something >> lacking, feel free to mention it, or modify the framework. :) > > I did port the atmel_mci driver to the MMC framework and posted the results on > this mailing list a few months back. However, some people apparently > experienced > issues I have never been able to reproduce, and got few review. > I recently adapted the AT91 SD/MMC support patch and the atmel_mci port to use > the new C structures access, I'll repost it in a couple days in case anyone's > interested. >
Yeah, I see that now. I'm catching up from being in various other project quagmires. Sadly, I can't apply your patch if people are running into problems with it, but I'd far prefer it. I also don't have such a board, though. If someone could apply Albin's patches, and try to identify why it's not working, I'd be very appreciative. :) Andy _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
