how to boot embedded system

Hi all

I build os for embedded target. I make initrd.gz file (using
TOOLCHAIN/rootfs/).
And I put initrd.gz along with syslinux.cfg and vmlinuz
(vmlinuz_2.6.21.7-dist) in CF(compact flash). At the time of booting its
giving me error:
"Kernel panic - not syncing VFS: Unable to mount root fs on unknown block
(0,0)."

how can I fix this problem?

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