SD card reader
rtsx* at pci?
sdmmc* at rtsx?
driver provides support for the Realtek
RTS5209, RTS5227, RTS5229, RTS522A, RTS5249, RTS525A, RTL8402, RTL8411, and
RTL8411B SD card readers.
SD/MMC transactions to communicate with SD or SDHC devices inserted into the
driver first appeared in
driver was written by
driver does not support MS (Memory Stick)
and xD (Extreme Digital) devices even though the hardware supports them.
Support for SDIO interrupts is not implemented.