Hi,
Philipp Zabel finally made the pxamci issue clear. It turned out, that pxamci 
needs the DMA destination address to be aligned to 8 bytes. In some cases it 
happened, that the address was aligned to 4 bytes causing controller to 
incorrectly transfer data (and resulting into error like "mmc0: unrecognised 
SCR structure version 1"). The following patch allows to debug this issue and 
moreover fixes it by moving one 4 byte entry of mmc_card structure, aligning 
the DMA destination back to 8 bytes.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>