Grub2 EFI + wimboot can boot WinPE ?

[At1ant]

At first I run Grub2 MBR (boot in legacy mode) and wimboot to start MSDART 8.0:
[undefined=undefined]menuentry "MSDART-8.0.iso" {
loopback loop /MSDART-8.0.iso
linux16 /wimboot
initrd16 \
newc:bcd:(loop)/Boot/BCD \
newc:boot.sdi:(loop)/Boot/boot.sdi \
newc:boot.wim:(loop)/sources/boot.wim
}

menuentry "MSDART-8.0 files" {
linux16 ($root)/wimboot
initrd16 \
newc:bcd:($root)/MSDART-8.0/BCD \
newc:boot.sdi:($root)/MSDART-8.0/boot.sdi \
newc:boot.wim:($root)/MSDART-8.0/boot.wim
}[/undefined]

Both versions have started fine. After that I tried to boot MSDART under Grub2 EFI. When pushing the menu flash disk was blinking like at Grub2 MBR booting, but in the end it wrote one line and going to reboot. This line disappears so quickly that I can not make out what it says. Adding "pause" parameter stops booting at black screen. The testing was held under Dell Optiplex 3020 with latest firmware - A09, wimboot - 2.5.1 signed.

So Grub2 EFI with wimboot can boot WinPE ?
Or there is a problem in something else ?