Le 25/06/2020 à 22:41, David Blevins a écrit :
List,

Apologies, I left HTML mode enabled on my web client.
I understand that a Linux dmesg is probably not very useful.
I can provide a different set of system information (or an
OpenBSD dmesg from an MBR boot) but I'm not sure what
set of information would be most useful in determining my
issue regarding GPT boot on this particular system.

Hi David,

In order to use GPT you need a BIOS that supports it. In most of the cases, this means an UEFI BIOS.

Concerning multiboot:

- Using MBR, you have a plethora of boot managers that will work. You just need to select "edit" in the installer instead of "whole" to keep existing partitions. - Using GPT/EFI, there is less options but I'd recommend rEFInd. You also have to edit partition table if you want to keep the existing partitions.

In both cases, a system upgrade of one of the OS present on the disk could result in a modified boot sequence (OpenBSD will overwrite UEFI boot loaders at each upgrade, Windows is well known to set itself as default boot at install, ..). If you setup a multiboot don't expect any help from OpenBSD, you are on your own.


Regards,

Damien

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