[syslinux] Problems PXE booting syslinux.efi on HP EliteBook 2560p / 8460p

[Patrick Masotta]

Hi there,
I have experienced problems on HP Elitebook 2560p and 8460p 
latest firmware installed:
2560p 68SSU ver. F50. 08/04/2014 
8460p 68SCF ver. F50. 08/04/2014


PXE boot, syslinux.efi gets perfectly TFTP transferred, it nevers asks for ldlinux.e64, and immediately gives up.

I have traced the problem to:

/syslinux-6.03/efi/udp.c\core_udp_open()
/syslinux-6.03/efi/main.c\efi_create_binding(&Udp4ServiceBindingProtocol, &Udp4Protocol);
/syslinux-6.03/gnu-efi/gnu-efi-3.0/lib/hand.c\LibLocateHandle(ByProtocol, bguid, NULL, &nr_handles, &handles);

When LibLocateHandle() try to locate EFI_UDP4_SERVICE_BINDING_PROTOCOL it fails with
EFI_NOT_FOUND (14) which looks like an HP firmware issue. 
Newer versions of the HP Elitebook family like 2570p and 8470p PXE boot syslinux.efi correctly.
Unfortunately this error does not display any error message on 6.0.3.

I wonder if this problem with HP EFI firmware affecting current but not the newest hardware it's not 
somehow related to the recent thread "Problem boot PXE UEFI on HP ML350 Gen9"
http://www.syslinux.org/archives/2015-March/023305.html
In this case the ldlinux.e64 is requested but never received even when offered by the TFTP server.


Best,
Patrick