diff options
| author | David Brownell <david-b@pacbell.net> | 2007-08-08 09:12:54 -0700 |
|---|---|---|
| committer | Pierre Ossman <drzeus@drzeus.cx> | 2007-09-23 22:17:27 +0200 |
| commit | 15a0580ced081a0f7dc2deea8a4812bdc5e9a109 (patch) | |
| tree | 8540ae8e0ac8d33cec931276fee1b0bf10435f7c /drivers/mmc/host/Kconfig | |
| parent | af51715079e7fb6b290e1881d63d815dc4de5011 (diff) | |
mmc_spi host driver
This is the latest version of the MMC-over-SPI support. It works
on 2.6.23-rc2 plus git-mmc (from rc1-mm2), along with the preceding
patches which teach the rest of the MMC stack about SPI.
The main issue of note is that sometimes cards need to be power cycled
to recover after certain faults. Also, it may sometimes be necessary
to disable CRCs. ("modprobe mmc_core use_spi_crc=n")
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: mikael.starvik@axis.com,
Cc: Hans-Peter Nilsson <hp@axis.com>
Cc: Jan Nikitenko <jan.nikitenko@gmail.com>
Cc: Mike Lavender <mike@steroidmicros.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc/host/Kconfig')
| -rw-r--r-- | drivers/mmc/host/Kconfig | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index e23082fe88d..68fb052afd3 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -100,3 +100,16 @@ config MMC_TIFM_SD To compile this driver as a module, choose M here: the module will be called tifm_sd. +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. + |