linux/drivers/mmc/card/Kconfig
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   1#
   2# MMC/SD card drivers
   3#
   4
   5comment "MMC/SD/SDIO Card Drivers"
   6
   7config 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
  17config 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
  35config 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
  53config 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
  60config 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.
  71
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