MMC/SD/SDIO card support

modulename: mmc.ko

and/or

mmc_core.ko

configname: CONFIG_MMC

Linux Kernel Configuration
└─>Device Drivers
└─>MMC/SD/SDIO card support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This selects MultiMediaCard, Secure Digital and Secure
Digital I/O support.

If you want MMC/SD/SDIO support, you should say Y here and
also to your specific host controller driver.

source code:
arch/arm/mach-u300/mmc.c