tftp second file

[g10]

i would like to compile the ipxe with an embedded script that does

embeddedscript.ipxe
--------------------
#!ipxe
dhcp
read tftp file abc.txt
read first line of abc.txt "runme = http://ipaddress/winpe/boot.ipxe"
then boot runme

so how do i setup the script file and compile this
make embed=embeddedscript.ipxe didn't do anything for me, no compiler errors, and when i ran it, it was the same iso version.

note: on gpxe site i saw:
$ make EMBEDDED_IMAGE=../contrib/scripts/static.gpxe
so can i do something like that ?

PS: it would be nice to get NFS support (seems like it was removed)

thanks