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bootargs parameters to boot with initramfs built in linux kernel

What are the right bootargs parameters which uboot pass to linux for booting with built

in initramfs?

My layout:

omap3evm mistral board(it's not exactly mistral, but very close to), rev G, kernel ver. 2.6.37.

Initramfs image is built from "Arago"  file system, and i can boot using NFS.

I built the image inside the kernel and can't boot using parameters:

mem=220M ip=dhcp console=ttyO2,115200n8

On http://processors.wiki.ti.com/index.php/Initrd page is mentioned that no need in "root=" ,
 "initrd=" need because the fs is built in, but after starting kernel, during boot, on filesystem
 searching I receive an error:
"Unable to mount root fs on unknown-block(2,0)" I don't remember exactly the line, but that's
 the meaning

And another question connected to previous:
 will I have shell(sh) after boot, or i have to run some routines/scripts, without user intervention,
 which will find the real
 File system?

Any help will be appreciated