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_MINORS 18 int "Number of minors per block device" 19 depends on MMC_BLOCK 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 35config 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 53config MMC_BLOCK_DEFERRED_RESUME 54 bool "Deferr MMC layer resume until I/O is requested" 55 depends on MMC_BLOCK 56 default n 57 help 58 Say Y here to enable deferred MMC resume until I/O 59 is requested. This will reduce overall resume latency and 60 save power when theres an SD card inserted but not being used. 61 62config SDIO_UART 63 tristate "SDIO UART/GPS class support" 64 depends on TTY 65 help 66 SDIO function driver for SDIO cards that implements the UART 67 class, as well as the GPS class which appears like a UART. 68 69config MMC_TEST 70 tristate "MMC host test driver" 71 help 72 Development driver that performs a series of reads and writes 73 to a memory card in order to expose certain well known bugs 74 in host controllers. The tests are executed by writing to the 75 "test" file in debugfs under each card. Note that whatever is 76 on your card will be overwritten by these tests. 77 78 This driver is only of interest to those developing or 79 testing a host driver. Most people should say N here. 80