I have implemented an SD card driver for Phytec (NXP) LPC3180, starting with driver in Atmel AT91SAM BSP. Implemented 
low-level functions for read, write, get cid/csd, etc. and verify that they work. Hooked up to the sim system and 
initialization seems to complete ok. But, when I try to mount the device I get the message below, I can't locate 
mount_dos cmd, which it complains about. Any ideas? Thanks. Todd

when i start the driver:

Path=0 -
 target=0 lun=0     Direct-Access(0) - SD:#3 SU01G Rev: 8.0

when i try to mount:

# mount -vvvvv -t dos /dev/hd0 /mnt/usb
Parsed: mount from [/dev/hd0] mount on [/mnt/usb] type [dos]
exec: mount_dos /dev/hd0 /mnt/usb
Using internal mount (mount_dos not found)
Type    [dos] Flags 0x00000000
Device  [/dev/hd0] Directory [/mnt/usb]
Options []
mount: Can't mount /mnt/usb (type dos)
mount: Possible reason: Resource busy