GPT and Fedora 17
awilliam at redhat.com
Fri Mar 2 21:42:23 UTC 2012
On Fri, 2012-03-02 at 17:37 +0000, Pádraig Brady wrote:
> On 02/07/2012 12:54 AM, 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.
> Yep as expected F17 alpha is broken in the same way on my laptop.
So it seems the boot flag on protective MBR does not, in fact, fix all
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