Talk:Unified Extensible Firmware Interface

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Revision as of 06:32, 29 June 2019 by Scdbackup (talk | contribs) (Explanation why i removed the Expansion box about -boot_image partition_table=off)
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I do not think that the command

# bcdedit /set {bootmgr} path \EFI\path\to\app.efi

"tell the Windows boot loader to run a different UEFI application" as mentioned in the wiki (in the "Windows changes boot order" section) I think it add an entry in the UEFI firmware. But that can be as well accomplished under Linux with efibootmgr command. If the UEFI is weird (by refusing to boot something other than Windows for example); I do not think it will be of any help. I am not a Windows specialist and so I do not take the responsibility to edit this section, but someone more knowledgeable than me should double check it.

—This unsigned comment is by Olive (talk) 13:00, 20 September 2016‎. Please sign your posts with ~~~~!

From my reading, it seems that this command should trick windows into running a different EFI application instead of its own boot manager (bootmgfw.efi). I don't have the means to test it right now, but given that there are plenty of other recommendations in the article, I don't think it hurts to keep this command around. We'll just have to wait until someone gives it a test. Silverhammermba (talk) 15:35, 20 September 2016 (UTC)
The `bcdedit` command causes Windows to chainload the named .efi loader, no new NVRAM entries are made. Head on a Stick (talk) 15:49, 23 March 2019 (UTC)

Remove UEFI boot support from optical media

The question was posed in an "Expansion" box, whether omitting the partition table in the ISO would disable EFI booting from optical media. It would not, because the UEFI specs say that optical media shall boot via El Torito, not via partition table. The partition table is used if the image is presented on hard-disk-like storage media. (In practice, several EFI implementations happily ignore this difference. But the Macs in question seem to respect it.)