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Linux/drivers/mmc/core/Kconfig

  1 #
  2 # MMC core configuration
  3 #
  4 config PWRSEQ_EMMC
  5         tristate "HW reset support for eMMC"
  6         default y
  7         depends on OF
  8         help
  9           This selects Hardware reset support aka pwrseq-emmc for eMMC
 10           devices. By default this option is set to y.
 11 
 12           This driver can also be built as a module. If so, the module
 13           will be called pwrseq_emmc.
 14 
 15 config PWRSEQ_SIMPLE
 16         tristate "Simple HW reset support for MMC"
 17         default y
 18         depends on OF
 19         help
 20           This selects simple hardware reset support aka pwrseq-simple for MMC
 21           devices. By default this option is set to y.
 22 
 23           This driver can also be built as a module. If so, the module
 24           will be called pwrseq_simple.
 25 
 26 config MMC_BLOCK
 27         tristate "MMC block device driver"
 28         depends on BLOCK
 29         default y
 30         help
 31           Say Y here to enable the MMC block device driver support.
 32           This provides a block device driver, which you can use to
 33           mount the filesystem. Almost everyone wishing MMC support
 34           should say Y or M here.
 35 
 36 config MMC_BLOCK_MINORS
 37         int "Number of minors per block device"
 38         depends on MMC_BLOCK
 39         range 4 256
 40         default 8
 41         help
 42           Number of minors per block device. One is needed for every
 43           partition on the disk (plus one for the whole disk).
 44 
 45           Number of total MMC minors available is 256, so your number
 46           of supported block devices will be limited to 256 divided
 47           by this number.
 48 
 49           Default is 8 to be backwards compatible with previous
 50           hardwired device numbering.
 51 
 52           If unsure, say 8 here.
 53 
 54 config MMC_BLOCK_BOUNCE
 55         bool "Use bounce buffer for simple hosts"
 56         depends on MMC_BLOCK
 57         default y
 58         help
 59           SD/MMC is a high latency protocol where it is crucial to
 60           send large requests in order to get high performance. Many
 61           controllers, however, are restricted to continuous memory
 62           (i.e. they can't do scatter-gather), something the kernel
 63           rarely can provide.
 64 
 65           Say Y here to help these restricted hosts by bouncing
 66           requests back and forth from a large buffer. You will get
 67           a big performance gain at the cost of up to 64 KiB of
 68           physical memory.
 69 
 70           If unsure, say Y here.
 71 
 72 config SDIO_UART
 73         tristate "SDIO UART/GPS class support"
 74         depends on TTY
 75         help
 76           SDIO function driver for SDIO cards that implements the UART
 77           class, as well as the GPS class which appears like a UART.
 78 
 79 config MMC_TEST
 80         tristate "MMC host test driver"
 81         help
 82           Development driver that performs a series of reads and writes
 83           to a memory card in order to expose certain well known bugs
 84           in host controllers. The tests are executed by writing to the
 85           "test" file in debugfs under each card. Note that whatever is
 86           on your card will be overwritten by these tests.
 87 
 88           This driver is only of interest to those developing or
 89           testing a host driver. Most people should say N here.
 90 

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