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linux-libre
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drivers
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mmc
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card
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Kconfig

Kconfig 2.1 KB
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  1. #
    2. 

  2. # MMC/SD card drivers
    3. 

  3. #
    4. 

  4. 

  5. comment "MMC/SD/SDIO Card Drivers"
    6. 

  6. 

  7. config MMC_BLOCK
    8. 

  8. 	tristate "MMC block device driver"
    9. 

  9. 	depends on BLOCK
    10. 

  10. 	default y
    11. 

  11. 	help
    12. 

  12. 	  Say Y here to enable the MMC block device driver support.
    13. 

  13. 	  This provides a block device driver, which you can use to
    14. 

  14. 	  mount the filesystem. Almost everyone wishing MMC support
    15. 

  15. 	  should say Y or M here.
    16. 

  16. 

  17. config MMC_BLOCK_MINORS
    18. 

  18. 	int "Number of minors per block device"
    19. 

  19. 	depends on MMC_BLOCK
    20. 

  20. 	range 4 256
    21. 

  21. 	default 8
    22. 

  22. 	help
    23. 

  23. 	  Number of minors per block device. One is needed for every
    24. 

  24. 	  partition on the disk (plus one for the whole disk).
    25. 

  25. 

  26. 	  Number of total MMC minors available is 256, so your number
    27. 

  27. 	  of supported block devices will be limited to 256 divided
    28. 

  28. 	  by this number.
    29. 

  29. 

  30. 	  Default is 8 to be backwards compatible with previous
    31. 

  31. 	  hardwired device numbering.
    32. 

  32. 

  33. 	  If unsure, say 8 here.
    34. 

  34. 

  35. config MMC_BLOCK_BOUNCE
    36. 

  36. 	bool "Use bounce buffer for simple hosts"
    37. 

  37. 	depends on MMC_BLOCK
    38. 

  38. 	default y
    39. 

  39. 	help
    40. 

  40. 	  SD/MMC is a high latency protocol where it is crucial to
    41. 

  41. 	  send large requests in order to get high performance. Many
    42. 

  42. 	  controllers, however, are restricted to continuous memory
    43. 

  43. 	  (i.e. they can't do scatter-gather), something the kernel
    44. 

  44. 	  rarely can provide.
    45. 

  45. 

  46. 	  Say Y here to help these restricted hosts by bouncing
    47. 

  47. 	  requests back and forth from a large buffer. You will get
    48. 

  48. 	  a big performance gain at the cost of up to 64 KiB of
    49. 

  49. 	  physical memory.
    50. 

  50. 

  51. 	  If unsure, say Y here.
    52. 

  52. 

  53. config SDIO_UART
    54. 

  54. 	tristate "SDIO UART/GPS class support"
    55. 

  55. 	depends on TTY
    56. 

  56. 	help
    57. 

  57. 	  SDIO function driver for SDIO cards that implements the UART
    58. 

  58. 	  class, as well as the GPS class which appears like a UART.
    59. 

  59. 

  60. config MMC_TEST
    61. 

  61. 	tristate "MMC host test driver"
    62. 

  62. 	help
    63. 

  63. 	  Development driver that performs a series of reads and writes
    64. 

  64. 	  to a memory card in order to expose certain well known bugs
    65. 

  65. 	  in host controllers. The tests are executed by writing to the
    66. 

  66. 	  "test" file in debugfs under each card. Note that whatever is
    67. 

  67. 	  on your card will be overwritten by these tests.
    68. 

  68. 

  69. 	  This driver is only of interest to those developing or
    70. 

  70. 	  testing a host driver. Most people should say N here.
    71. 

  71.