Malvineous, the operating systems supported by this motherboard are Windows 8 and Windows 7. Please check the following link for additional information
Regarding Linux, I would recommend you to post your question on Linux community.
Thanks for your reply. Unfortunately the Linux community can't really help, because as far as they are concerned, everything is working correctly, and indeed the process I have used works on other Intel and non-Intel motherboards.
So it's not that I necessarily need help with Linux, it's that I need help with Intel's UEFI implementation on this motherboard. Is there an engineer available who worked on this UEFI implementation, who can perhaps advise what the requirements are in order for an .efi image to appear in the boot menu? Or perhaps explain why an entry in the NVRAM would be ignored?
Thanks again for any help you can provide.
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Malvineous, i found this site that might help you to get additional information. https://www-ssl.intel.com/content/www/us/en/architecture-and-technology/unified-extensible-firmware-interface/efi-homepage-general-technology.html
Many thanks for the pointers. I didn't get a response from the e-mail address (at least not yet) but some of the other links led me to the solution. I need to place a bootable UEFI image in \EFI\boot\bootx64.efi - this file doesn't actually do anything, but the UEFI firmware detects its presence and then shows the NVRAM entries added by efibootmgr.
I did this in the UEFI shell by running this command:
mkdir fs0:\EFI\boot cp fs0:\EFI\grub\grubx64.efi fs0:\EFI\boot\bootx64.efi
Now my machine boots into GRUB and then Linux automatically!
I see what people say though when they talk about the current crop of UEFI firmware being quirky... This and the number of bugs I am finding in VisualBIOS lead me to think that there hasn't been much testing done at all on any of this!