Syslinux - Jun 2010 - [BISECT] gpxelinux.0 stalls at Trying to load: pxelinux.cfg/.....

While trying out gpxelinux.0, I realized that it didn't work in the
latest release candidate. This is what happens:

This is a screenshot from a VM: http://bsfh.ath.cx/gpxe.png
It hangs there for a long time.

I tried in two configurations:
1) Qemu KVM with tap networking, ISC dhcpd and tftp from iputils on the
host.
2) Desktop, dnsmasq from OpenWRT as dhcp/tftp server.

The only difference on the desktop was that all the zeroes there are
replaced with what looks like a real unique ID.

On both desktop and VM, it would continue booting after waiting for a
long time, but I don't know if that is reproducible (I saw it a few
times, wasn't always as patient).

Anyway, I bisected it and this is what turned up:

68ac3bd7646f38a61acf798ef48b9cc3e0d5c8e8 is the first bad commit
commit 68ac3bd7646f38a61acf798ef48b9cc3e0d5c8e8
Author: H. Peter Anvin <hpa at linux.intel.com>
Date:   Tue Jun 22 15:16:47 2010 -0700

    pxe: fix the timeout logic for RRQ

    Fix the timeout logic for RRQ, to avoid a spew of identical RRQ
    packets which at best will annoy the server.

    Signed-off-by: H. Peter Anvin <hpa at linux.intel.com>

:040000 040000 e710a995bc46f883beb3092ab7bea50971e0bb74
4558dbedbf451194a9ef9e7f5ba1a0207f0b0cd7 M      core

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