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Re: [Xen-users] UEFI support in Xen

I was using the packaged install.
Actually, looks like that was not a video problem. I've managed to run openSUSE as dom0 with EFI, GRUB shows the same warning.

But I ran into another problem: only one CPU core is detected. It's similar to this one:

Have you seen such issues before?

2012/8/13 Casey DeLorme <cdelorme@xxxxxxxxx>
Debian Wheezy I presume.  Are you using the packaged install of Xen 4.1.3, or did you compile it from source?

I read about a video problem months ago but never ran into it.  I am guessing your grub configuration file is missing efi video modules, but I could be wrong.

Try selecting the default kernel from the boot menu so you can open up /boot/grub/grub.cfg with vi or a text edit or vi, and look for:

function load_video {
insmod efi_gop
insmod efi_uga
insmode video_bochs
insmode video_cirrus

Notice the two efi related lines, if you are missing them you might have to add them manually.

If that doesn't work you may have to generate grub without linux_xen, and compare to see if some other modules are being used by your system.

If it works, then after Xen boots Dom0 you want to check your available memory.  Either with "free" or "xl dmesg | grep -i 'system ram'".  If you have all your RAM available in xl then you are good, if not you may need to modify xen source:

On Sat, Aug 11, 2012 at 11:25 AM, Svyatoslav Scherbina <sch.svyatoslav@xxxxxxxxx> wrote:
I am using Xen 4.1.3 in Debian with stock kernel 3.2.0.

I have two problems:
1) Just after GRUB2 starts to boot the OS, the following appears:

      Loading Xen 4.1-amd64 ...
      WARNING: no console will be available to OS

2) After a couple of seconds, the machine reboots.
The last thing I've managed to recognize is "Scrubbing free RAM"

2012/8/11 Casey DeLorme <cdelorme@xxxxxxxxx>


More information would be helpful:

* Which version of Xen?
* What problems are you running into?

I have been running Xen 4.2 with UEFI, it boots fine but I had to modify the source before compiling to get it to recognize all of my RAM.


On Sat, Aug 11, 2012 at 5:07 AM, Svyatoslav Scherbina <sch.svyatoslav@xxxxxxxxx> wrote:
Hi all!

I am having troubles with booting Xen with grub2 in UEFI mode.
Does Xen support this configuration? Are there any specific settings?

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