Commit | Line | Data |
---|---|---|
1c6a0718 PO |
1 | # |
2 | # MMC/SD card drivers | |
3 | # | |
4 | ||
5 | comment "MMC/SD Card Drivers" | |
1c6a0718 PO |
6 | |
7 | config MMC_BLOCK | |
8 | tristate "MMC block device driver" | |
790864dc | 9 | depends on BLOCK |
1c6a0718 PO |
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 | ||
98ccf149 PO |
17 | config 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 | ||
6e418a9d NP |
35 | config SDIO_UART |
36 | tristate "SDIO UART/GPS class support" | |
37 | depends on MMC | |
38 | help | |
39 | SDIO function driver for SDIO cards that implements the UART | |
40 | class, as well as the GPS class which appears like a UART. | |
41 | ||
88ae600d PO |
42 | config MMC_TEST |
43 | tristate "MMC host test driver" | |
44 | default n | |
45 | help | |
46 | Development driver that performs a series of reads and writes | |
47 | to a memory card in order to expose certain well known bugs | |
48 | in host controllers. The tests are executed by writing to the | |
49 | "test" file in sysfs under each card. Note that whatever is | |
50 | on your card will be overwritten by these tests. | |
51 | ||
52 | This driver is only of interest to those developing or | |
53 | testing a host driver. Most people should say N here. |