NAME
pxammc —
MMC/SD/SDIO controller
SYNOPSIS
pxammc0 at pxaip?
sdmmc* at pxammc?
DESCRIPTION
The pxammc driver supports the MMC/SD/SDIO
controller integrated in PXA255 and PXA27x processors.
The sdmmc(4) subsystem performs SD/MMC transactions to communicate with whatever MMC/SD/SDIO devices are inserted into the card slot.
SEE ALSO
HISTORY
The pxammc driver first appeared in
OpenBSD 4.2.
AUTHORS
The pxammc driver was written by
Uwe Stuehler
<uwe@openbsd.org>.
CAVEATS
To work around a problem stated in an errata for the PXA27x processor family, the driver limits the bus frequency to 9.75 MHz instead of the theoretically supported maximum frequency of 19.5 MHz.