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Re: GPT and Fedora 17



On Mon, Feb 06, 2012 at 04:54:01PM -0800, Adam Williamson wrote:
> On Mon, 2012-02-06 at 23:19 +0000, Pádraig Brady wrote:
> > On 02/06/2012 10:40 PM, Brian C. Lane wrote:
> > > In Fedora 16 we changed to using GPT as the default disklabel for new
> > > installs. In a few cases, mostly limited to Lenovo hardware, we found
> > > that some BIOS's would not boot from GPT. We blacklisted Lenovo, falling
> > > back to msdos labels in order to solve this.
> > > 
> > > Thanks to Matthew Garrett we found that switching on the boot flag of
> > > the GPT's protective MBR these BIOS's would then boot from GPT. Matthew
> > > wrote a patch for parted to allow controlling this flag using the
> > > disk_set pmbr_boot command in parted. This is in parted-3.0-7
> > > 
> > > In anaconda-17.6 I have reverted the Lenovo blacklist and changed things
> > > so that pmbr_boot is always set on GPT labeled installs. This should
> > > ensure that thing boot correctly.
> > > 
> > > If this still causes problems the symptom will be that grub never starts
> > > and the bios may complain about not being able to find an OS. If you
> > > have problems with this please open a bug with the output from dmidecode
> > > 
> > > You can still force usage of msdos partitions by passing nogpt on the
> > > kernel cmdline.
> > 
> > Hmm, I tried that workaround I think on my Lenovo T520 with BIOS 1.29,
> > and it didn't help.  I.E. point (1.) from the link referenced here:
> > https://bugzilla.redhat.com/show_bug.cgi?id=735733#c31
> > 
> > Fingers crossed I just missed something at the time.
> > I'll try out again tomorrow maybe.
> 
> Yes, I remember that. Please do test the change out and let us know the
> results, we'd definitely like to know.
> 
> Brian, this change takes effect from Alpha TC2 (whenever we spin it),
> it's not in Alpha TC1, correct?

Correct.

-- 
Brian C. Lane | Anaconda Team | IRC: bcl #anaconda | Port Orchard, WA (PST8PDT)

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