Re: Updating EFI boot loader results in boot hangup

On Thu, Aug 18, 2022, 12:19 AM Simon J. Gerraty <sjg@juniper.net> wrote:

> Warner Losh <imp@bsdimp.com> wrote:
> > I think I broke it with my latest updates. I don't have a good ZFS
> testing setup
> > so I'm spending a little time enhancing the bootable image generator to
> have
> > one that I can easily test boot with qemu.
>
> FWIW bhyve is *excellent* for mucking about with EFI and loader in general.
>
> I did all the UEFI support for Junos using bhyve (initially so I could
> test LOADER_VERIEXEC), and I regurlarly use it to test various install
> processes - pxe boot and net install, usb install, etc.
>
> I build loader.efi from a branch off main, everyting else is from
> stable/12 at present.
>
> The combination of makefs, mkimg and bhyve - make hacking the low level
> boot bits much safer.
>
> Byhve is quick too - my Junos VM's take about 40-50s from start to login
> prompt.
>

Yup. Use all that stuff. My issue was tooling (creating the bookable ZFS
images) as well as not being able to create an image that recreates the
problem. I've fixed the tooling issue, but used qemu so I could capture
stout to see if the tests pass/fail easily in a script. Bhyve, as far as I
know, can't do that without delving into separate expect scripts. And it
can't run arm binaries on x86...

I also use bhyve when I want to attach a debugger or need to test longer
running things.

But in this case it took a while to find how to reproduce... but I found
one and just pushed a fix.

Warner

>