"try to free memory without signature"

[NiKiZe]

real undionly.kpxe will never display anything other than undi, the intel part which is showing in your output is from the iPXE native drivers which are included in ipxe.pxe builds.

I would recommend using latest ipxe.pxe as a test as well and see if you get the same memory signature error there as well.

Now over to your script... if you get a boot loop your dhcp is not configured to deal with that, you can read more at http://ipxe.org/howto/chainloading#break...inite_loop

What is it that you really want to boot? is it a file on tftp?
If the later of your scripts don't work, what is the actual ipxe error (including ipxe error url, don't exclude the message) that you are seeing after the chain command?