Does anyone boot OLPC on nfsroot?

[Hugo Chang]

Does the OLPC initramfs "dracut" support nfsroot?
It can load from tftp server when I type "boot net".
I use OLPC sourse kernel and add support to root on nfs.
The initrd.img is original,I didn't change it.
the OLPC file is copied from olpc.fth and kernel command lines is
"root=/dev/nfs nfsroot=<serverip>:/<dir> ip:dhcp"
The message show that it can get ip form DHCP server.
But always stop at "No root device found""Boot has failed,sleeping forever."
Does anyone have any idea?
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