[android-porting] about play mp3

Hi all,
          I want to record the sound and play the previous recorded
sound on beagle board. I put a mp3 in first partition of SD card, but
I can't mount the first partitioon at /sdcard(under RFS file) by
     mount -t vfat /dev/mmcblk0p1 /sdcard.
I always get "mount: No such file or directory", but I'm sure that RFS
file has the file named sdcard. I also try to use "su" to get the
permission, but the hyper terminal appeals:
sh: can't access tty; job control turned off

Someone can help me?

By the way, the kernel and RFS I used is the one that shared by

Does that one support recording the voice?

Many thanks.