Problem with SDHC cards in MMC1(bottom) Slot on EVM??

Kevin Claycomb

We are having a problem with getting SDHC cards to be detected by linux when they are in the MMC1 slot on the EVM. We are using a sandisk 16GB uSD card in an adapter. It works great in the top slot, but doesn't ever show in /dev/ when we put it in the MMC1 slot(bottom). This is a particular issue for us due to our custom board(which replicates the EVM behavior) utilizing only the MMC1 SD Card port(it's a long story why this is the case). Regular 2GB uSD cards work fine in MMC1, so it has something to do with the higher capacity/speeds of the SDHC cards I assume. (problem with initialization or switching into high speed mode????)

Anyhow, can anyone replicate this behavior on their evm's or custom designs?? Is there a patch to get this fixed up out there? I am using MVL 5.0 with the 2.6.18 kernel.

Kevin

over 15 years ago

0 Kevin Claycomb over 15 years ago

Intellectual 420 points

I should have mentioned that this is for a DM365 EVM/design. Thanks!

0 Juan Gonzales over 15 years ago in reply to Kevin Claycomb

TI__Mastermind 37340 points

please see http://wiki.davincidsp.com/index.php/How_to_use_SDHC_on_DM365_with_MontaVista_5.0

0 Kevin Claycomb over 15 years ago in reply to Juan Gonzales

Intellectual 420 points

Juan,

I was unclear in my original post. I have the MVL 5 patch and it does enable SDHC support for the MMC0 interface. However, it appears that the MMC1 interface still does not work. I have replicated it across 2 EVMs and just wanted to get verification that someone else has the same issue or maybe has solved this problem.

Kevin

0 Juan Gonzales over 15 years ago in reply to Kevin Claycomb

TI__Mastermind 37340 points

I should have read more carefully. I suspect that MMC1 interfaced may be configured as GPIO by CPLD, though I have not confirmed. The EVM Technical Reference Manual discusses how this is controlled by CPLD and describes how to access CPLD registers to verify or change the way this interface is configured.

http://support.spectrumdigital.com/boards/evmdm365/revc/

I would start there.

0 Kevin Claycomb over 15 years ago in reply to Juan Gonzales

Intellectual 420 points

Juan Gonzales said:
I suspect that MMC1 interfaced may be configured as GPIO by CPLD

Juan,

A regular SD card works fine so I think that would eliminate a PINMUX configuration issue on MMC1.

Kevin

0 Juan Gonzales over 15 years ago in reply to Kevin Claycomb

TI__Mastermind 37340 points

you are right, that would rule out the pinmux issue; just thought it was something worth checking.

I have quickly looked at the MMC/SD Hardware User Guide and cannot see any reason why the hardware would not support it; therefore, I would suggest this is a software issue. Unfortunately, I am not aware of any other patches which may help. At this point, I would suggest looking at the driver source code associated with the SDHC patch and verify that the changes made cover both MMC0 and MMC1.

Processors

Processors forum

Problem with SDHC cards in MMC1(bottom) Slot on EVM??