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Linux/drivers/mmc/card/Kconfig

  1 #
  2 # MMC/SD card drivers
  3 #
  4 
  5 comment "MMC/SD/SDIO Card Drivers"
  6 
  7 config MMC_BLOCK
  8         tristate "MMC block device driver"
  9         depends on BLOCK
 10         default y
 11         help
 12           Say Y here to enable the MMC block device driver support.
 13           This provides a block device driver, which you can use to
 14           mount the filesystem. Almost everyone wishing MMC support
 15           should say Y or M here.
 16 
 17 config MMC_BLOCK_MINORS
 18         int "Number of minors per block device"
 19         depends on MMC_BLOCK
 20         range 4 256
 21         default 8
 22         help
 23           Number of minors per block device. One is needed for every
 24           partition on the disk (plus one for the whole disk).
 25 
 26           Number of total MMC minors available is 256, so your number
 27           of supported block devices will be limited to 256 divided
 28           by this number.
 29 
 30           Default is 8 to be backwards compatible with previous
 31           hardwired device numbering.
 32 
 33           If unsure, say 8 here.
 34 
 35 config MMC_BLOCK_BOUNCE
 36         bool "Use bounce buffer for simple hosts"
 37         depends on MMC_BLOCK
 38         default y
 39         help
 40           SD/MMC is a high latency protocol where it is crucial to
 41           send large requests in order to get high performance. Many
 42           controllers, however, are restricted to continuous memory
 43           (i.e. they can't do scatter-gather), something the kernel
 44           rarely can provide.
 45 
 46           Say Y here to help these restricted hosts by bouncing
 47           requests back and forth from a large buffer. You will get
 48           a big performance gain at the cost of up to 64 KiB of
 49           physical memory.
 50 
 51           If unsure, say Y here.
 52 
 53 config SDIO_UART
 54         tristate "SDIO UART/GPS class support"
 55         depends on TTY
 56         help
 57           SDIO function driver for SDIO cards that implements the UART
 58           class, as well as the GPS class which appears like a UART.
 59 
 60 config MMC_TEST
 61         tristate "MMC host test driver"
 62         help
 63           Development driver that performs a series of reads and writes
 64           to a memory card in order to expose certain well known bugs
 65           in host controllers. The tests are executed by writing to the
 66           "test" file in debugfs under each card. Note that whatever is
 67           on your card will be overwritten by these tests.
 68 
 69           This driver is only of interest to those developing or
 70           testing a host driver. Most people should say N here.

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