Comment # 3 on bug 903948 from marcin kowalski

ipxe boot menu used :


#!ipxe

dhcp
  set baseurl:string http://download.opensuse.org/tumbleweed
  set arch:string x86_64
  goto opensuse-generic-boot

:opensuse-generic-boot

  initrd   ${baseurl:string}/repo/oss/boot/${arch:string}/loader/initrd
  imgfetch ${baseurl:string}/repo/oss/boot/${arch:string}/loader/linux 
  boot     linux Textmode=1 install=${baseurl:string}/repo/oss console=ttyAMA0
console=ttyS0 

32bit tumbleweed used the same arguments, and works fine.

qemu command line : 

qemu-system-x86_64 -kernel bin/ipxe.lkrn -m 512 -serial stdio

qemu used 2.1+dfsg-5+b1 (debian)