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 MMC_BLOCK_DEFERRED_RESUME
  54         bool "Deferr MMC layer resume until I/O is requested"
  55         depends on MMC_BLOCK
  56         default n
  57         help
  58           Say Y here to enable deferred MMC resume until I/O
  59           is requested. This will reduce overall resume latency and
  60           save power when theres an SD card inserted but not being used.
  61
  62 config SDIO_UART
  63         tristate "SDIO UART/GPS class support"
  64         depends on TTY
  65         help
  66           SDIO function driver for SDIO cards that implements the UART
  67           class, as well as the GPS class which appears like a UART.
  68
  69 config MMC_TEST
  70         tristate "MMC host test driver"
  71         help
  72           Development driver that performs a series of reads and writes
  73           to a memory card in order to expose certain well known bugs
  74           in host controllers. The tests are executed by writing to the
  75           "test" file in debugfs under each card. Note that whatever is
  76           on your card will be overwritten by these tests.
  77
  78           This driver is only of interest to those developing or
  79           testing a host driver. Most people should say N here.