[gPXE] GRUB 1.97 PXE

[Stefan Hajnoczi]

PXE debugging messages in gPXE can be enabled by building like this:
make DEBUG=pxe_call,pxe_file,pxe_tftp,pxe_preboot,pxe_undi,pxe_udp,pxe_loader
[...your usual build target...]

You should see PXE call debug output (which PXE interface call is
being made).  Hopefully this will help us determine how GRUB and gPXE
are interacting.

If you get too many messages, you may wish to enable the serial
console in gPXE so that GRUB has the screen all to itself and you can
log gPXE debug messages from serial.  See config/defaults/pcbios.h
#define CONSOLE_SERIAL.

Stefan