UEFI booting survey

Jakob Alvermark jakob at alvermark.net
Mon Dec 18 14:17:04 UTC 2017

On 12/17/17 20:52, Warner Losh wrote:
> Greetings
> If you are booting off UEFI and have a bit of an unusual setup, I'd like
> you to drop me a line.
> The setup that I'm looking for is any case where you load boot1.efi off one
> drive (cd, ssd, hdd, nvme, etc), but don't have a FreeBSD system on that
> drive, but on a different drive on the system.
> An example of this may be loading boot1.efi off what FreeBSD would call
> /dev/ada0p1, but having root come from /dev/ada1p1.
> It's my belief that due to the fragility of this setup, few, if any, people
> have this setup. If you do, please take a minute to reply to this message.
> In the coming months, we're looking at dropping boot1.efi and instead
> installing /boot/loader.efi onto the ESP (most likely as
> \efi\freebsd\loader.efi). As part of the move to fully support the UEFI
> Boot Manager, we're dropping the 'search every device in the system' part
> of the current boot1 algorithm. It will be possible to configure the system
> to continue booting (either via the new efibootmgr which will allow any
> imaginable combination, or possibly via a fallback mechanism needed for the
> embedded EFIs that have poor UEFI Variable support at the moment), but as
> part of an upgrade to a future FreeBSD 12, some intervention will be
> necessary.
> Please let me know if you have an unusual setup like this.
> Warner
Hi Warner,

I have what I guess is an unusual setup, not like what you describe 
above, but unusual because I tripple-boot my laptop using only the UEFI 
boot manager to select the OS to boot.
I have FreeBSD-current, OpenBSD-current and Windows 10 on different 
partitions on one SSD. By default it boots FreeBSD.

This was accomplished with bcdedit.exe in Windows, but now I realize 
this could be done with the new efibootmgr.
I wanted to try it out, but it panics on my laptop. Sometimes just 
'kldload efirt' just panics, sometimes it loads but panics as soon as I 
run efibootmgr or efivar.
How can I help debugging this?


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