Hi folks, has anyone successfully patched u-boot to support MMC on the SAM9G20? I have a SAM9G20-EK board with only 1 slot and have recompiled the latest u-boot (2011.09) with MMC support.

I can almost get the SDCard to work. When I do an "mmc rescan" followed by "mmcinfo" it successfully reads the card info, however if I try to read/write anything to the card I constantly get the following:

gen_atmel_mci: CMDR 00001050 (16) ARGR 00000200 (SR: 000cc0e5) Command Failed

From the status register it looks like there is a CRC7 error and a Response Index Error.

I'm just not very familiar with the MCI spec to understand where to begin debugging this.

Any suggestions?

Thanks, Matt.

[quote="mattwood2000"]Hi folks, has anyone successfully patched u-boot to support MMC on the SAM9G20? I have a SAM9G20-EK board with only 1 slot and have recompiled the latest u-boot (2011.09) with MMC support.

I can almost get the SDCard to work. When I do an "mmc rescan" followed by "mmcinfo" it successfully reads the card info, however if I try to read/write anything to the card I constantly get the following:

gen_atmel_mci: CMDR 00001050 (16) ARGR 00000200 (SR: 000cc0e5) Command Failed

From the status register it looks like there is a CRC7 error and a Response Index Error.

I'm just not very familiar with the MCI spec to understand where to begin debugging this.

Any suggestions?

Thanks, Matt.[/quote]

Check out the u-boot patches in OpenEmbedded for the SAM9M10EKES.
This will work for cards up to 2 GB (No SDHC)

Ulf, thanks for the info. Turns out it was a hardware issue - removing R42 solved the problem. I guess the SPI SCK line being tied to the MCI CLK line was causing issues.

Thanks, Matt.