from a position of moderate ignorance related to MMC drivers, is
there a reason that MMC/SD support over SDI requires !HIGHMEM?
from drivers/mmc/host/Kconfig:
config MMC_SPI
tristate "MMC/SD over SPI (EXPERIMENTAL)"
depends on MMC && SPI_MASTER && !HIGHMEM && EXPERIMENTAL
select CRC7
select CRC_ITU_T
help
Some systems accss MMC/SD cards using a SPI controller instead of
using a "native" MMC/SD controller. This has a disadvantage of
being relatively high overhead, but a compensating advantage of
working on many systems without dedicated MMC/SD controllers.
If unsure, or if your system has no SPI master driver, say N.
should a selection of MMC_SPI absolutely *require* "!HIGHMEM"?
rday
--
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA
http://crashcourse.ca
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