Re: UEFI boot

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On Thu, Sep 13, 2018 at 04:40:19PM +0100, Patrick Welche wrote:
> Where does firmware? (BIOS?) look for the "boot blocks"?
> 
> Story so far: I installed NetBSD on a zotac, using /usr/mdec/*.efi.
> "BIOS" set to "UEFI only", and all was well.
> 
> I then stupidly fought with ubuntu, as it seems to have a "nice" feature
> that you can only install as UEFI if you installed from UEFI media. (For
> NetBSD, I PXE booted => legacy, and then happily installed UEFI.)
> 
> After installation, boot went straight to the ubuntu menu.
> 
> I didn't get on with ubuntu 18, so thought I would get back to NetBSD-only
> with
> 
>   mount /dev/dk0 /mnt
>   /mnt/EFI/boot /mnt/EFI/uboot
>   mkdir /mnt/EFI/boot
>   cp /usr/mdec/*.efi /mnt/EFI/boot
> 
> When I reboot, I *still* get the ubuntu menu. I thought that changing
> bootx64.efi back to the NetBSD one would be sufficient. Is that not
> the way it works?

After a massive hint from Bob Nestor - thanks! - I see from the ubuntu
side:

$ efibootmgr -v
BootCurrent: 0008
Timeout: 1 seconds
BootOrder: 0008,0000
Boot0000* Windows Boot Manager  VenHw(99e275e7-75a0-4b37-a2e6-c5385e6c00cb)WINDOWS.........x...B.C.D.O.B.J.E.C.T.=.{.9.d.e.a.8.6.2.c.-.5.c.d.d.-.4.e.7.0.-.a.c.c.1.-.f.3.2.b.3.4.4.d.4.7.9.5.}...a................
Boot0008* ubuntu        HD(1,GPT,38a65f87-f860-440c-b8d9-43f1758b730d,0x28,0x80000)/File(\EFI\UBUNTU\SHIMX64.EFI)

so bootx64.efi doesn't get a look-in!

Cheers,

Patrick