[ 438.340000] mmc0: mmc_rescan_try_freq: trying to init card at 400000 Hz
[ 438.430000] mmc0: mmc_rescan_try_freq: trying to init card at 300000 Hz
[ 438.520000] mmc0: mmc_rescan_try_freq: trying to init card at 200000 Hz
[ 438.630000] mmc0: mmc_rescan_try_freq: trying to init card at 195313 Hz

CONFIG_MMC_ATMELMCI=y
CONFIG_MMC=y
CONFIG_MMC_DEBUG=y
CONFIG_MMC_CLKGATE=y
CONFIG_MMC_BLOCK=y
CONFIG_MMC_BLOCK_MINORS=8
CONFIG_MMC_BLOCK_BOUNCE=y
CONFIG_MMC_SDHCI=y
CONFIG_MMC_ATMELMCI=y

root@arm9260:~# zcat /proc/config.gz |grep MMC
CONFIG_MMC=y
# CONFIG_MMC_DEBUG is not set
# CONFIG_MMC_UNSAFE_RESUME is not set
CONFIG_MMC_CLKGATE=y
# MMC/SD/SDIO Card Drivers
CONFIG_MMC_BLOCK=y
CONFIG_MMC_BLOCK_MINORS=8
CONFIG_MMC_BLOCK_BOUNCE=y
# CONFIG_MMC_TEST is not set
# MMC/SD/SDIO Host Controller Drivers
# CONFIG_MMC_SDHCI is not set
# CONFIG_MMC_SDHCI_PXAV3 is not set
# CONFIG_MMC_SDHCI_PXAV2 is not set
CONFIG_MMC_AT91=y
# CONFIG_MMC_ATMELMCI is not set
# CONFIG_MMC_DW is not set
# CONFIG_MMC_VUB300 is not set
# CONFIG_MMC_USHC is not set

root@arm9260:~# dmesg |grep mmc
Kernel command line: mem=64M console=ttyS0,115200 rw rootwait root=/dev/mmcblk0p2
Waiting for root device /dev/mmcblk0p2...
mmc0: SD Status: Invalid Allocation Unit size.
mmc0: card lacks mandatory switch function, performance might suffer.
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new SD card at address b368
mmcblk0: mmc0:b368 SDC 976 MiB
mmcblk0: p1 p2 p3
EXT3-fs (mmcblk0p2): warning: maximal mount count reached, running e2fsck is recommended
EXT3-fs (mmcblk0p2): using internal journal
EXT3-fs (mmcblk0p2): recovery complete
EXT3-fs (mmcblk0p2): mounted filesystem with ordered data mode
Adding 92732k swap on /dev/mmcblk0p3. Priority:-1 extents:1 across:92732k SS

CONFIG_MMC_ATMELMCI=y

CONFIG_MMC_AT91=y

static struct mci_platform_data __initdata ek_mci0_data = {
.slot[0] = {
.bus_width = 4,
.detect_pin = AT91_PIN_PA4,
},
};