MultiMediaCard
Instructions to use the MultiMediaCard (MMC/SD) on your Armadeus board
Contents
Introduction
You can use standard MMC/SD cards with your Armadeus board, if you have the corresponding connector attached to your devt board. See MMC/SD page to know how to connect the hardware part.
Installation
when you build your kernel image, then modify your configuration:
[user@toto]$ make xconfig
in Device Drivers->MMC/SD Card support->iMX Support In FileSystems, don't forgt to add support for the filesystem on the MMC and if you activate FAT/VFAT, don't forget to activate Native Language Support (NLS) otherwise you'll get errors like:
Unable to load NLS charset cp437 FAT: codepage cp437 not found
Save your configuration and then rebuild your kernel image:
[user@toto]$ make
now you should have following drivers in your kernel source tree:
drivers/mmc/
Copy mmc_core.ko, imxmmc.ko & mmc_block.ko to your target root filessytem in /lib/modules/ or reflash the generated rootfs.
If not already existing then create MMC block devices:
# mknod /dev/mmcblk0 b 254 0 # mknod /dev/mmcblk0p1 b 254 1
If not already existing then create the mount point (/mnt/mmc):
# mkdir -p /mnt/mmc
Usage
First, load the core controller driver on your board:
# insmod /lib/modules/drivers/mmc/mmc_core.ko
and then the iMX MMC Host driver:
# insmod /lib/modules/drivers/mmc/imxmmc.ko
To access the MMC as a block device, load this module too:
# insmod /lib/modules/drivers/mmc/mmc_block.ko
Then just mount the MMC, for example (FAT32 formatted card):
# mount -t vfat /dev/mmca1 /mnt/mmc
You can then access the MMC's files from /mnt/mmc directory
