UEFI trouble with OVMF under Xen - nothing boots - SOLVED

[Marcin Cieslak]

On Sat, 1 Apr 2017, Marcin Cieslak wrote:

> On Sat, 1 Apr 2017, Marcin Cieslak wrote:
> 
> > This is a follow up to the UEFI Windows boot problems
> > reported after 4.7 got imported:
> > 
> > https://lists.freebsd.org/pipermail/freebsd-xen/2016-June/002745.html
> > 
> > I am using FreeBSD 12.0-CURRENT #6 r314708: Mon Mar  6 13:09:31 UTC 2017     root at o.saper.info:/usr/obj/usr/src/sys/GENERIC  amd64 as dom0
> > 
> > In the 4.5 times I could install and boot Windows 2016 Technical Preview 5 without
> > major problems. In fact, I started using this as my default Windows
> > environment - it was working very well and very fast.
> 

So, for the archives:

I have compiled the newest OVMF git master in the DEBUG mode and found out
that under normal qemu both I/O debug port 0x402 logging or serial port logging
(depending how OVMF got compiled) do work.

I have never been getting debug output from the OVMF started by Xen.
What I didn't know is that firmware images are compiled into the hvmloader
so that just replacing the ovmf.bin DOES NOT work.

I must have had a 32-bit ovmf.bin on the filesystem when I was compiling
xen-tools; after replacing it with a 64-bit version and rebuilding
xen-tools things started to work.

Sorry for noise!

Marcin