[linux-2.6-block.git] / drivers / mmc / card / Kconfig

#
# MMC/SD card drivers
#

comment "MMC/SD 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_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 MMC
	help
	  SDIO function driver for SDIO cards that implements the UART
	  class, as well as the GPS class which appears like a UART.
Commit	Line	Data
1c6a0718 PO	1	#
	2	# MMC/SD card drivers
	3	#
	4
	5	comment "MMC/SD 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
98ccf149 PO	17	config MMC_BLOCK_BOUNCE
	18	bool "Use bounce buffer for simple hosts"
	19	depends on MMC_BLOCK
	20	default y
	21	help
	22	SD/MMC is a high latency protocol where it is crucial to
	23	send large requests in order to get high performance. Many
	24	controllers, however, are restricted to continuous memory
	25	(i.e. they can't do scatter-gather), something the kernel
	26	rarely can provide.
	27
	28	Say Y here to help these restricted hosts by bouncing
	29	requests back and forth from a large buffer. You will get
	30	a big performance gain at the cost of up to 64 KiB of
	31	physical memory.
	32
	33	If unsure, say Y here.
	34
6e418a9d NP	35	config SDIO_UART
	36	tristate "SDIO UART/GPS class support"
	37	depends on MMC
	38	help
	39	SDIO function driver for SDIO cards that implements the UART
	40	class, as well as the GPS class which appears like a UART.
	41