I successfully booted Core 7.2 using PXE, however an unable to automatically install TCEs at boot via on boot.lst.
I've created my own cpio.gz with all modules listed under tmp/tce/optional .. I have a tmp/tce/onboot.lst.
I've tried the following PXE config, with and without the APPEND line.
I can load any module successfully by manually running tce-load -i (mod name) . eg. tce-load -i bash
LABEL Media Installer
APPEND pretce showapps