Kconfig revision 50cec37c1ac24e9a02b845242a4712e2fb092b5c
11c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman# 21c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman# MMC/SD card drivers 31c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman# 41c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman 557105737f6a0b39305a85ac176cc9fd4a236d8c2Pierre Ossmancomment "MMC/SD/SDIO Card Drivers" 61c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman 71c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossmanconfig MMC_BLOCK 81c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman tristate "MMC block device driver" 9790864dcc2b3fe65355dd84ef8481e54b1bc61b6Jan Engelhardt depends on BLOCK 101c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman default y 111c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman help 121c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman Say Y here to enable the MMC block device driver support. 131c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman This provides a block device driver, which you can use to 141c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman mount the filesystem. Almost everyone wishing MMC support 151c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman should say Y or M here. 161c6a0718f0bfdab0d9b7da5f7b74f38a0058c03aPierre Ossman 175e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johanssonconfig MMC_BLOCK_MINORS 185e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson int "Number of minors per block device" 19b37427b0a4e01ab5aaec1c9af7cef616ac4ce6d6Chris Ball depends on MMC_BLOCK 205e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson range 4 256 215e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson default 8 225e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson help 235e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson Number of minors per block device. One is needed for every 245e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson partition on the disk (plus one for the whole disk). 255e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson 265e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson Number of total MMC minors available is 256, so your number 275e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson of supported block devices will be limited to 256 divided 285e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson by this number. 295e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson 305e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson Default is 8 to be backwards compatible with previous 315e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson hardwired device numbering. 325e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson 335e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson If unsure, say 8 here. 345e71b7a64cb4c6cff75ca42b535d8227526ec592Olof Johansson 3598ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossmanconfig MMC_BLOCK_BOUNCE 3698ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman bool "Use bounce buffer for simple hosts" 3798ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman depends on MMC_BLOCK 3898ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman default y 3998ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman help 4098ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman SD/MMC is a high latency protocol where it is crucial to 4198ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman send large requests in order to get high performance. Many 4298ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman controllers, however, are restricted to continuous memory 4398ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman (i.e. they can't do scatter-gather), something the kernel 4498ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman rarely can provide. 4598ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman 4698ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman Say Y here to help these restricted hosts by bouncing 4798ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman requests back and forth from a large buffer. You will get 4898ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman a big performance gain at the cost of up to 64 KiB of 4998ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman physical memory. 5098ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman 5198ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman If unsure, say Y here. 5298ccf14909ba02a41c5925b0b2c92aeeef23d3b9Pierre Ossman 536e418a9d26ab4fd44b3e07dc1158027cbdf0a919Nicolas Pitreconfig SDIO_UART 546e418a9d26ab4fd44b3e07dc1158027cbdf0a919Nicolas Pitre tristate "SDIO UART/GPS class support" 556e418a9d26ab4fd44b3e07dc1158027cbdf0a919Nicolas Pitre help 566e418a9d26ab4fd44b3e07dc1158027cbdf0a919Nicolas Pitre SDIO function driver for SDIO cards that implements the UART 576e418a9d26ab4fd44b3e07dc1158027cbdf0a919Nicolas Pitre class, as well as the GPS class which appears like a UART. 586e418a9d26ab4fd44b3e07dc1158027cbdf0a919Nicolas Pitre 5988ae600d58a8d3160144af480133a988404b8d59Pierre Ossmanconfig MMC_TEST 6088ae600d58a8d3160144af480133a988404b8d59Pierre Ossman tristate "MMC host test driver" 6188ae600d58a8d3160144af480133a988404b8d59Pierre Ossman help 6288ae600d58a8d3160144af480133a988404b8d59Pierre Ossman Development driver that performs a series of reads and writes 6388ae600d58a8d3160144af480133a988404b8d59Pierre Ossman to a memory card in order to expose certain well known bugs 6488ae600d58a8d3160144af480133a988404b8d59Pierre Ossman in host controllers. The tests are executed by writing to the 6550cec37c1ac24e9a02b845242a4712e2fb092b5cWill Newton "test" file in debugfs under each card. Note that whatever is 6688ae600d58a8d3160144af480133a988404b8d59Pierre Ossman on your card will be overwritten by these tests. 6788ae600d58a8d3160144af480133a988404b8d59Pierre Ossman 6888ae600d58a8d3160144af480133a988404b8d59Pierre Ossman This driver is only of interest to those developing or 6988ae600d58a8d3160144af480133a988404b8d59Pierre Ossman testing a host driver. Most people should say N here. 70