89 lines
2.6 KiB
Plaintext
89 lines
2.6 KiB
Plaintext
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#
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# MMC/SD card drivers
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#
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comment "MMC/SD/SDIO Card Drivers"
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config MMC_BLOCK
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tristate "MMC block device driver"
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depends on BLOCK
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default y
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help
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Say Y here to enable the MMC block device driver support.
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This provides a block device driver, which you can use to
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mount the filesystem. Almost everyone wishing MMC support
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should say Y or M here.
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config MMC_BLOCK_MINORS
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int "Number of minors per block device"
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depends on MMC_BLOCK
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range 4 256
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default 8
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help
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Number of minors per block device. One is needed for every
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partition on the disk (plus one for the whole disk).
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Number of total MMC minors available is 256, so your number
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of supported block devices will be limited to 256 divided
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by this number.
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Default is 8 to be backwards compatible with previous
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hardwired device numbering.
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If unsure, say 8 here.
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config MMC_BLOCK_BOUNCE
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bool "Use bounce buffer for simple hosts"
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depends on MMC_BLOCK
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default y
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help
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SD/MMC is a high latency protocol where it is crucial to
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send large requests in order to get high performance. Many
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controllers, however, are restricted to continuous memory
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(i.e. they can't do scatter-gather), something the kernel
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rarely can provide.
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Say Y here to help these restricted hosts by bouncing
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requests back and forth from a large buffer. You will get
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a big performance gain at the cost of up to 64 KiB of
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physical memory.
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If unsure, say Y here.
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config MMC_BLOCK_DEFERRED_RESUME
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bool "Deferr MMC layer resume until I/O is requested"
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depends on MMC_BLOCK
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default n
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help
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Say Y here to enable deferred MMC resume until I/O
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is requested. This will reduce overall resume latency and
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save power when theres an SD card inserted but not being used.
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config SDIO_UART
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tristate "SDIO UART/GPS class support"
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help
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SDIO function driver for SDIO cards that implements the UART
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class, as well as the GPS class which appears like a UART.
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config MMC_TEST
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tristate "MMC host test driver"
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help
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Development driver that performs a series of reads and writes
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to a memory card in order to expose certain well known bugs
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in host controllers. The tests are executed by writing to the
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"test" file in debugfs under each card. Note that whatever is
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on your card will be overwritten by these tests.
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This driver is only of interest to those developing or
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testing a host driver. Most people should say N here.
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config MMC_BLOCK_TEST
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tristate "MMC block test"
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depends on MMC_BLOCK && IOSCHED_TEST
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help
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MMC block test can be used with test iosched to test the MMC block
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device.
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Currently used to test eMMC 4.5 features (packed commands, sanitize,
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BKOPs).
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