Trying to mount SD Card

Hi. 

I'trying to mount one SD Card in a Micro2440 under Linux. But when I try #
mount /dev/mmcblk0 /mnt/mmc it gives me an error looked like these.

mount: Mounting /dev/mmcblko /mnt/mmc - Invalid argument

Does anyone know what can be happening?

I tried many different arguments for mount command and get the same error.

Thanks. Pedro Henrique.

Many variants: no FAT support in the kernel, SD card have partition table,
if this you should use not /dev/mmcblk0, but /dev/mmcblk0p1 for first
partition.