[U-Boot-Users] Booting Linux with cramfs from RAM

Hi,

I'd like to boot a linux kernel using a cramfs as root file system. At U-Boot prompt I load the 2 images, kernal and rootfs:

$> tftp 20200000 vmImage $> tftp 20800000 fsImage.cramfs

Then i set the environment variable bootargs:

$> setenv bootargs root=/dev/ram rootfstype=cramfs initrd=0x20800000,nnn

(nnn stand for size of the rootfs)

And finally:

$> bootm 20200000

The kernel is decompressed and starts runnnig but i get this error:

No filesystem could mount root, tried: cramfs Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)

Thats it... I can not resolve this problem, does anyone know anything about it? Did anyone boot with a fs in RAM? and if so, how did you do it?

Thanks and regards, Diego A. Fons.