I found a solution! Use syslinux.efi and ldlinux.e64 from experimental The files can be found in those package versions
syslinux-common_6.04~git20171011.af7e95c3+dfsg1-3_all.deb syslinux-efi_6.04~git20171011.af7e95c3+dfsg1-3_all.deb Now UEFI netowrk boot works with my Thinkpad X230 with the new BIOS 2.73. This means, there's no need for a loading a grubnetx64.efi and use different config file for UEFI boot. You can use the same configs in pxelinux.cfg/... created by fai-chboot for PXE (legacy BIOS) and UEFI network boot. -- regards Thomas
