RFC: PCI SD host controller driver & mmc/mmcsd modules improvements

[Alexander Motin]

Ilya Bakulin wrote:
> I have another SD card, 2 Gb size, in my camera. It's from Kingston. It doesn't work:
> 
> sdhci0-slot0: Card inserted
> mmc0: <MMC/SD bus> on sdhci0
> sdhci0-slot0: Command error 1 (opcode 2 arg 0 flags 103 dlen 0 dflags 0)
> mmc0: setting transfer rate to 50.000MHz
> 
> ... and no new storage devices appear.

Theoretically it may be an SDHC card. They are not responding to
incompatible host with alike symptoms. I have already implemented MMC
and SDHC support and going to publish it soon.

-- 
Alexander Motin