[deliverable/linux.git] / drivers / mmc / card / Kconfig

#
# MMC/SD card drivers
#

comment "MMC/SD/SDIO Card Drivers"

config MMC_BLOCK
	tristate "MMC block device driver"
	depends on BLOCK
	default y
	help
	  Say Y here to enable the MMC block device driver support.
	  This provides a block device driver, which you can use to
	  mount the filesystem. Almost everyone wishing MMC support
	  should say Y or M here.

config MMC_BLOCK_MINORS
	int "Number of minors per block device"
	depends on MMC_BLOCK
	range 4 256
	default 8
	help
	  Number of minors per block device. One is needed for every
	  partition on the disk (plus one for the whole disk).

	  Number of total MMC minors available is 256, so your number
	  of supported block devices will be limited to 256 divided
	  by this number.

	  Default is 8 to be backwards compatible with previous
	  hardwired device numbering.

	  If unsure, say 8 here.

config MMC_BLOCK_BOUNCE
	bool "Use bounce buffer for simple hosts"
	depends on MMC_BLOCK
	default y
	help
	  SD/MMC is a high latency protocol where it is crucial to
	  send large requests in order to get high performance. Many
	  controllers, however, are restricted to continuous memory
	  (i.e. they can't do scatter-gather), something the kernel
	  rarely can provide.

	  Say Y here to help these restricted hosts by bouncing
	  requests back and forth from a large buffer. You will get
	  a big performance gain at the cost of up to 64 KiB of
	  physical memory.

	  If unsure, say Y here.

config SDIO_UART
	tristate "SDIO UART/GPS class support"
	depends on TTY
	help
	  SDIO function driver for SDIO cards that implements the UART
	  class, as well as the GPS class which appears like a UART.

config MMC_TEST
	tristate "MMC host test driver"
	help
	  Development driver that performs a series of reads and writes
	  to a memory card in order to expose certain well known bugs
	  in host controllers. The tests are executed by writing to the
	  "test" file in debugfs under each card. Note that whatever is
	  on your card will be overwritten by these tests.

	  This driver is only of interest to those developing or
	  testing a host driver. Most people should say N here.
Commit	Line	Data
1c6a0718 PO	1	#
	2	# MMC/SD card drivers
	3	#
	4
57105737	5	comment "MMC/SD/SDIO Card Drivers"
1c6a0718 PO	6
	7	config MMC_BLOCK
	8	tristate "MMC block device driver"
790864dc	9	depends on BLOCK
1c6a0718 PO	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
5e71b7a6 OJ	17	config MMC_BLOCK_MINORS
5e71b7a6 OJ	18	int "Number of minors per block device"
b37427b0	19	depends on MMC_BLOCK
5e71b7a6 OJ	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
98ccf149 PO	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
6e418a9d NP	53	config SDIO_UART
6e418a9d NP	54	tristate "SDIO UART/GPS class support"
4f73bc4d	55	depends on TTY
6e418a9d NP	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
88ae600d PO	60	config MMC_TEST
88ae600d PO	61	tristate "MMC host test driver"
88ae600d PO	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
50cec37c	66	"test" file in debugfs under each card. Note that whatever is
88ae600d PO	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.