>> I have successfully installed Fedora 18 Beta as Dom0 on one computer,
>> and am now trying to do the same on another. I am using all of the
>> standard Fedora 18 packages, including xen-4.2.0-6.fc18.x86_64.
>> 
>> On the second computer, I ended up with an EFI grub2 install.
>> 
>> I used yum to install xen, and noted that the package installation did
>> not update /etc/grub2-efi.cfg.
>> 
>> I ran grub2-mkconfig by hand, and this added Xen entries to
>> /etc/grub2-efi.cfg. However, booting failed: grub2 complained that it
>> did not know the multiboot keyword.
>> 
>> Does anyone have experience getting EFI grub2 to boot Xen/Fedora 18?
>> Is my trouble expected?

> Did you try native UEFI boot? So booting the xen.efi binary directly from 
> UEFI ? 
> 
> Also note that F18 kernel doesn't have proper UEFI support for dom0 (yet),
> because it hasn't been upstreamed yet..

I eventually figured out how to install Fedora 18 using the MBR-style
grub2.

My Fedora 18 install media was a thumbdrive; what I discovered was that
if I did *not* instruct my motherboard firmware's UEFI menu to boot from
this USB device, then it seemed to pick it up as an old-style MBR boot
instead.  From that point on, Anaconda seemed to assume the computer
had a BIOS, not UEFI.

It appears the Fedora 18 install image supports both BIOS/MBR and UEFI,
and the motherboard's firmware picks up the MBR if not explicitly asked
to boot the device as UEFI.

After picking through Anaconda and finding no option (i.e., a way to
install using an MBR boot instead of a UEIF boot), I suspect I could
achieve the same effect by manually creating an msdos partition table
on the target hard drive instead of a GPT partition table.

-- 
Mike

:wq
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