Revert Kernel-Latest install to dom0 from another OS

[Owen Phillis]

Hello,


I wonder if someone might be able to help with this: how do I tell Xen
to start dom0 with a specific kernel, from another OS?


a bit of background...

I'm trying to setup a 4yr old i7, x-99 Asus m/b, and a new Nvidia 2080
Super. Experience has been interesting thus far, with some success -
enough to indicate I should be able to get there. Lots of really weird
disk issues with 4.0.1, but 4.0.2 rc3 seems better. GUI works out of the
box, though compositing has to be disabled to gain a moderate level of
UI performance.


So in an effort to eek out UX performance gains, I updated dom0 with
kernel-latest (5.3.x) which has had the devastating effecting of
stopping dom0 from starting... as in it's completely dead. Xen starts
then I get a corrupt multicolour line at the top of the screen of some
other splashes of a white and grey pixels about the place - I see none
of the expected boot messages.


I'm trying to repair things from another OS. I've mounted root and boot
and the old 4.9 kernel is still available.


I'm hunting around for the bit of Xen that selects which kernel to start
dom0 with - assuming it works that way. And I'm not having much luck.


Thanks for any help / tips / advise!

O.

[Owen Phillis]

OK, stupid me didn't mount the EFI partition under boot. I think I found
what I'm looking for in xen.cfg.


O.