On Fri, May 22, 2020 at 04:09:51PM -0000, Ryan Harper wrote:
> We will need two formats for the hybrid mode, ptable: gpt and ptable:
> dos

I don't see why this should be the case.  Are we not emitting GPT everywhere
today, even when the system is booting in BIOS mode?  Late-model BIOSes do
support booting from GPT; I would think at this point anything that doesn't
support GPT is too old to be of practical concern.

So a GPT table with a bios_grub partition and an EFI System Partition should
suffice.

> For gpt, the config from comment #1 applies, we'll have both bios_grub
> and an efi partition (possibly a secondary for resilient boot).

Resilient boot is only applicable in the case of multiple disks; and then
each disk in the root set should have exactly one ESP and exactly one
bios_grub partition.

-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                   https://www.debian.org/
slanga...@ubuntu.com                                     vor...@debian.org

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https://bugs.launchpad.net/bugs/1827929

Title:
  curtin should support making installed systems BIOS+UEFI hybrid
  bootable

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