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> Date: Mon, 6 Jun 2016 09:49:01 +0200
> From: Daniel Widenfalk <Daniel@xxxxxxxxxxxx>
> To: xen-users@xxxxxxxxxxxxx
> Subject: Re: [Xen-users] Xen Continuously Reboots
> Message-ID: <55034474-f662-a2de-362c-d66ed899dcc9@xxxxxxxxxxxx>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> On 2016-06-06 03:22, Ray wrote:
> >
> > Re: [Xen-users] Xen Continuously Reboots
> >
> >
> > To: xen-users@xxxxxxxxxxxxx
> > From: Daniel Widenfalk <Daniel@xxxxxxxxxxxx>
> > Date: Sun, 5 Jun 2016 22:52:36 +0200
> > Delivery-date: Sun, 05 Jun 2016 20:53:33 +0000
> > List-id: Xen user discussion <xen-users.lists.xen.org>
> >
> >>> On 2016-06-05 20:11, Ray wrote:
> >
> >>> When I boot to Xen, the machine reboots over and over. This is a laptop
> >>> with stretch and Xen.
> >
> >>> <snipped>
> >
> >
> >>> Ray
> >
> >> * Are you using EFI or legacy boot?
> >> * How far do you get? Do you get the quick "Loading XEN..." thing at the
> >> start? Do you start seeing the xen pre-boot phase?
> >
> >> /Daniel W.
> > ______________________________
> >
> >
> > Daniel,
> >
> >
> > Thank you:
> >
> >
> > This is an EFI boot.
> >
> >
> > Once at the boot menu and the 5 seconds lapsed, the system went blank and started booting.
> >
> > Ray
>
> Hi,
>
> I've found that both Jessie and Stretch seem to have an error in their
> grub code for xen. The grub code does not recognize "efi" as a valid
> grub platform and therefore applies no-real-mode and eff=off to xen.
> "no-real-mode" means you will not get a VGA console and edd=off means
> xen will not fetch "Extended Disc Data" (whatever that means) from the
> bios.
>
> On my new system I had to edit /etc/grub/20_linux_xen (line 126) and
> add "efi" as a recognized boot platform:
>
> ---- Lines 125 - 30:
> echo '$(echo "$xmessage" | grub_quote)'
> if [ "\$grub_platform" = "pc" -o "\$grub_platform" = "efi" -o "\$grub_platform" = "" ]; then
> xen_rm_opts=
> else
> xen_rm_opts="no-real-mode edd=off"
> fi
> ----
>
> After making this change I got a working xen/linux vga console and could
> see what was going on. I hope this helps :)
>
> Best regards
> /Daniel Widenfalk
>
Daniel,
Thank you. The change looks straight forward. I only altered the one line by adding the "efi" test. The other lines matched what was in the file. There was no change in the system response.
So I also removed the 'noreboot' from grub command line for Xen. There was no change in the system response.
Then I commented out all the lines listed above except for the:
xen_rm_opts=
There still was no change in the system response.
After rebooting, selecting Advanced options for Debian GNU/Linux (with Xen), then
Xen hyperviser , version 4.6-amd64, then
Debian GNU/Linux with Xen 4.6-amd64 and Linux 4.5.0-2-amd64
the system hangs on a screen:
Loading Xen 4.6-amd65 ...
warning: no console will be available to OS
Loading Linux 4.5.0-2-amd64 ...
Loading initial ramdisk ...
And the system is hung.
So it seems there is still a problem.
Is there anything that may stop the /etc/grub/20_linux_xen from being loaded? Or possibly something that skips the grub-platform test section?
Ray
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