Hi all,

I'm using Linux 3.0.3 on a custom board based on AT91SAM9G45-EKES. My root filesystem (approx size is 1.6GB) is on SD Card (2GB SD Card).

I want to move my root filesystem to SDHC card (4GB SDHC). So I create a partition of approx size 3GB and move my root filesystem. While booting I get this error message from the mmc subsystem:
mmcblk0: retrying using single block read.
I probed into the error message and it is being printed from file drivers/mmc/card/block.c
The exact error in the transfer sequence is in brq.data & the error no. is -110.

When I use this SDHC card with Root file system partition size of 1.6GB as my SD card then it works fine.

Can anyone suggest what may be causing the error? Is it do with MMC Drivers or with my root filesystem or there is some parameters which I have ignored.

I'm using ext3 rootfilesystem.

-PJ

I get this same problem when accessing my uSD card as well. It used to be unrecoverable until I built the kernel with:

CONFIG_MMC_ATMELMCI_DMA

After this I get the errors, but the driver is able to recover.

Hi mark,

If I read the help given in this configuration, it reads that this code is still not stable enough.
But, it has worked for you, then I will surely give a try.

For me, micro SDHC 4GB class 2 cards cards were giving a problem, but class 4 cards worked fine. I have no clue about the mmc, so I'm not able to reason it out yet. This is not a permanent fix, but working for the time being.

If anyone can give some suggestions it will be helpful.

-PJ