| # |
| # 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 MMC_BLOCK_DEFERRED_RESUME |
| bool "Deferr MMC layer resume until I/O is requested" |
| depends on MMC_BLOCK |
| default n |
| help |
| Say Y here to enable deferred MMC resume until I/O |
| is requested. This will reduce overall resume latency and |
| save power when theres an SD card inserted but not being used. |
| |
| config SDIO_UART |
| tristate "SDIO UART/GPS class support" |
| 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. |
