1# 2# MMC/SD card drivers 3# 4 5comment "MMC/SD/SDIO Card Drivers" 6 7config MMC_BLOCK 8 tristate "MMC block device driver" 9 depends on BLOCK 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 17config 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 35config MMC_BLOCK_DEFERRED_RESUME 36 bool "Deferr MMC layer resume until I/O is requested" 37 depends on MMC_BLOCK 38 default n 39 help 40 Say Y here to enable deferred MMC resume until I/O 41 is requested. This will reduce overall resume latency and 42 save power when theres an SD card inserted but not being used. 43 44config SDIO_UART 45 tristate "SDIO UART/GPS class support" 46 help 47 SDIO function driver for SDIO cards that implements the UART 48 class, as well as the GPS class which appears like a UART. 49 50config MMC_TEST 51 tristate "MMC host test driver" 52 default n 53 help 54 Development driver that performs a series of reads and writes 55 to a memory card in order to expose certain well known bugs 56 in host controllers. The tests are executed by writing to the 57 "test" file in sysfs under each card. Note that whatever is 58 on your card will be overwritten by these tests. 59 60 This driver is only of interest to those developing or 61 testing a host driver. Most people should say N here. 62