Help me!!!

I made the test for the Beagleboard and Load Ansgtrom in SD, but I have a error when I run the next

OMAP3 beagleboard.org # ls

the error is

Scanning JFFS2 FS: /read_nand_cached: error reading nand off 0xd00000 size 819s

You are sitting at a u-boot prompt, not Linux prompt.

Type 'help'.

Per http://www.angstrom-distribution.org/demo/beagleboard/README.txt, try using:
setenv bootargs 'console=ttyS2,115200n8 console=tty0 root=/dev/mmcblk0p2 rootdelay=2 rootfstype=ext3 video=omapfb:vram:2M,vram:4M' ; saveenv ; boot

You could also save a second and a few keystrokes by trying:
setenv bootargs 'console=ttyS2,115200n8 console=tty0 root=/dev/mmcblk0p2 rootwait video=omapfb:vram:2M,vram:4M' ; saveenv ; boot