I did a few tests, here are the results.

BIOS real mode: works!
BIOS prot mode: works!
UEFI prot mode: boots, sets up long mode but then freezes.

To reproduce my test environment:
1. copy M6414960pre2.IMG to boot/menuet.img
2. run easyboot boot disk.img
3. see the txt files for the qemu invocation

A few hints for testing: a minimal easyboot/menu.cfg:
verbose 3
menuentry menuetos {
 kernel KERNEL.MNT
 module CONFIG.MNT
 module menuet.img
}

To disable auto configuration (zero out boot_info + 0x68):
verbose 3
menuentry menuetos {
 kernel KERNEL.MNT noauto
 module CONFIG.MNT
 module menuet.img
}

To force booting in real mode even when PMENTRY0 detected:
verbose 3
menuentry menuetos {
 kernel KERNEL.MNT real
 module CONFIG.MNT
 module menuet.img
}

Your PMENTRY0 is loaded at 0x700, it is expanded with a few fields (detected configuration size and source address,
detected ramdisk size and source address).

I've attached the following files:
- bios.txt, bios.mem: registers and memory dump right before jumping to the kernel (this works)
- uefi.txt, uefi.mem: registers and memory dump right before jumping to the kernel (I think it's ok)
- uefi2.mem: memory dump when the kernel freezes (it is already in long mode).
