IPXE Wimboot UEFI

[seb]

hi all,

I'm having hard time to boot winpe 5.0 X64 image with IPXE + Wimboot.
I currently use undionly.kpxe (IPXE 1.0.0+) and wimboot 2.3.0
with a Embed ipxe script

#!ipxe
kernel http://x.x.x.x/tests/wimboot/wimboot pause
initrd http://x.x.x.x/tests/winpe5/x64/bootmgr.efi bootmgr.efi
initrd http://x.x.x.x/tests/winpe5/x64/EFI/Micr...o_boot.ttf segmono_boot.ttf
initrd http://x.x.x.x/tests/winpe5/x64/EFI/Micr...slboot.ttf segoe_slboot.ttf
initrd http://x.x.x.x/tests/winpe5/x64/EFI/Micr...4_boot.ttf wgl4_boot.ttf
initrd http://x.x.x.x/tests/winpe5/x64/EFI/Micr...r_boot.ttf kor_boot.ttf
initrd http://x.x.x.x/tests/winpe5/x64/EFI/Micr...4_boot.ttf wgl4_boot.ttf
initrd http://x.x.x.x/tests/winpe5/x64/Boot/bcd bcd
initrd http://x.x.x.x/tests/winpe5/x64/Boot/boot.sdi boot.sdi
initrd http://x.x.x.x/tests/winpe5/x64/sources/boot.wim boot.wim
imgstat
prompt
boot

but during wimboot process, bootmrg.exe is extract from boot.wim and use to start setup instead of the bootx64.efi provide in my script.

Is it a problem related to UEFI environement ? or Wimboot ? or else ?

thanks for any help