How to pass options to the booted system via PXECONFIG script

[knatesan]

Thanks for the response..
Here is what i wanted to achieve..
i want to Pass "test.txt" file to the pxebooted linux image.

Below is what i tried..
"kernel nfs://192.168.13.5/var/www/nfsshare/casper/vmlinuz
initrd nfs://192.168.13.5/var/www/nfsshare/casper/initrd.gz
initrd nfs://192.168.13.5/var/www/nfsshare/test.txt /tmp/test.txt
echo now booting...
imgargs vmlinuz root=/dev/nfs boot=casper netboot=nfs nfsroot=192.168.13.5:/var/www/nfsshare/
boot"
but its not working though..
any help/clue on how to pass file to the linux image ?