Hello,

I'm trying to port linux on a custom board with at91sam9g20 processor. I successfully compiled and installed u-Boot (2011.03) and linux kernel 2.6.38 with patches from at91 maintainer. I'd like to have rootfs on an sd card which is connected to the slot_a of the at91 mci controller. Unfortunately I was not able to make sd working during last 4 days, I have limited possibility of debugging (no JTAG) so I only discovered that probing for sd card during the boot hangs up waiting for some response (functions mmc_rescan_try_freq -> mmc_send_if_cond ...). It should not be a hardware issue because on the same desk sd card works on bare metal application.

I also tried the same configuration of kernel (with only difference in slower processor at91sam9260 and sd card on slot_b) on at91sam9260ek development board, where sd card works fine.

Have anyone been solving similar problem, please?
(I can post more details, if needed...)

regards
Jan

The issue is (partially) solved. There was a problem with driver loading order - sd card driver was not loaded at the time of mounting the rootfs. I have solved it by loading it with
subsys_initcall(at91_mci_init); instead of module_init(at91_mci_init); I'm not sure how "ugly" this hack is, but now it works as I need.
The weird thing is, that this hack is not needed on the at91sam9260ek board.

regards
Jan