Hi,
I've tested pxqldr.bin and it pretty works on -at least- 5 different ethernet adapters. Thanks Dennis!
Before that, I started with pxegrub (aka part of Grub Legacy) but it has hard dependency of certain ethernet controller 
(for every controller there is a pxegrub-driver). It works on grub-known cards, but not on another.
Before I used pxqldr (which QNX ifs format and PXE API specific!) I spent too many time for grub, because pxegrub+QNX 
boot loading method was illustraited in QNX docs(Appendix: Advanced Qnet Topics). My vision, there should be note to :
1. pxegrub CARD RESRICTION feature
2. words about pxqldr (or any new will appear) + tftpd restriction (qnx distrib version..search for my post obout it).
This can help new to PXE boot tast people start without above described problems.