Compile the MMC driver

This took a long time to figure out how to do. The first thing you need is a copy of the OpenWRT sources.

svn co svn://dev.openwrt.org/openwrt/branches/8.09

If you want you can make your self an image. Otherwise let us get the driver:

wget http://wiki.xkyle.com/images/5/52/Mmc.tgz
tar xzf Mmc.tgz
cd mmc

Now you should take a look at the Makefile and the config.h to reflect your io pins. run make, then get the file into /lib/modules/kernel.version/ then:

echo 0xb8 > /proc/diag/gpiomask  #Or whatever your gpiomask is
insmod mmc

Here is my config:

#define LOG_LEVEL 3
#define USE_CMD18
#define USE_CMD25

/* GPIO pin 2 */
//#define SD_DI 0x04
#define SD_DI 0x020
/* GPIO pin 4 */
//#define SD_DO 0x10
#define SD_DO 0x10
/* GPIO pin 3 */
#define SD_CLK 0x08
/* GPIO pin 7 */
#define SD_CS 0x80

#if SD_DO == 0x10
        #define SHIFT_DO 3
#else
#if SD_DO == 0x40
        #define SHIFT_DO 1
#endif
#endif
#if SD_DI == 0x04
        #define SHIFT_DI 5
#else
#if SD_DI == 0x20
        #define SHIFT_DI 2
#endif
#endif