[U-Boot] at91sam9g45ekes SDHC/MMC

[Rob Emanuele]

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.

In another post, I will be more talk of the mmc/sd code and taking it forward.

Rob


On Mon, Apr 12, 2010 at 6:55 AM, Henry Súcart <henry.sucart at gmail.com> wrote:
> Hi Ulf,
>
> Thanks for the reply. I applied your patches but I still can't get it to
> read the SD card
>
> Without the SD card:
> U-Boot> mmc init 0
> mmc: command 55 failed (status: 0x0c100025)
> mmc: command 1 failed (status: 0x0c100025)
> No MMC card found
>
> With the SD card:
> U-Boot> mmc init 0
> mmc: command 1 failed (status: 0x0c100025)
> No MMC card found
>
>
>
> I'm not sure what's going on.
> On Tue, Apr 6, 2010 at 5:57 AM, Ulf Samuelsson <ulf.samuelsson at atmel.com>wrote:
>
>> Henry Súcart skrev:
>> > Hi,
>> >
>> > I've been trying to get an SD card working with an at91sam9g45ek-es
>> board. I
>> > read a couple of threads in the archive and ended up doing this:
>> >
>>
>> I have booted the AT91SAM9G45EKES (Actually the AT91SAM9M10EKES,
>> but it is almost the same) from SD-Card for the last month.
>> The patchset for 2009.11 is available for testing in my private git
>> branch on www.openembedded.org: origin/ulf/linux-2.6.30-20100317
>>
>> I came to the conclusion that the atmel MCI driver (written for the big
>> endian AVR32) has significant byte sex problems.
>>
>> BR
>> Ulf Samuelsson.
>>
>>
>> > I applied these patches:
>> >
>> > http://lists.denx.de/pipermail/u-boot/2009-August/059595.html
>> > http://lists.denx.de/pipermail/u-boot/2009-September/060053.html
>> > http://lists.denx.de/pipermail/u-boot/2009-September/060243.html
>> >
>> > Added these #define's to include/configs/at91sam9m10g45ek.h:
>> >
>> > #define CONFIG_CMD_EXT2   1
>> > #define CONFIG_CMD_FAT     1
>> > #define CONFIG_CMD_MMC   1
>> > #define CONFIG_MMC            1
>> > #define CONFIG_ATMEL_MCI  1
>> >
>> > Finally, I added this to the board init function:
>> >
>> > #ifdef CONFIG_ATMEL_MCI
>> > at91_mci0_hw_init(0, 4);
>> > #endif
>> >
>> > When I try it out this is what I get:
>> > U-Boot> mmc init 0
>> > mmc: clock 150000 too low; setting CLKDIV to 255
>> > mmc: command 1 failed (status: 0x0c100025)
>> > No MMC card found
>> >
>> > Am I doing something wrong? Any help is appreciated,
>> >
>> > Henry
>> >
>> >
>> >
>> > ------------------------------------------------------------------------
>> >
>> > _______________________________________________
>> > U-Boot mailing list
>> > U-Boot at lists.denx.de
>> > http://lists.denx.de/mailman/listinfo/u-boot
>>
>>
>
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