> But still have not found a way to boot Linux from Windows boot loader in plain UEFI. Where those exact 446 bytes are completely ignored. That's exactly what

> But still have not found a way to boot Linux from Windows boot loader in plain UEFI. Where those exact 446 bytes are completely ignored. That's exactly what I'm looking for: chainloading from bootmgfw by adding entries with bcdedit: this is because winload.exe loads the kernel (ntoskrnl) by reading the BCD, so maybe it's possible to make it load a linux kernel, or to replace winload.exe by something that will (you can revert that with `bcdedit /set {default} path \windows\system32\boot\winload.exe`) Have you explored that?