On Thu, Dec 4, 2014 at 12:41 AM, Adam Williamson <adamwill@xxxxxxxxxxxxxxxxx> wrote: > Hi, folks. Talking to cmurf, our resident OS X dual boot expert, on > #fedora-qa, it's become clear that when we adopted the OS X dual boot > criterion a few weeks back, we didn't have a good understanding of the > current state of that code and particularly upstream grub's support for > booting OS X via UEFI. Basically it seems that booting OS X from grub > didn't work then and doesn't work now and we can't realistically fix it, > so we shouldn't have put that criterion in place because it's not > something we can actually viably achieve. > > cmurf, roshi, kparal and I voted +1 to removing the criterion on that > basis. I'm hoping cmurf will be kind enough to look at the issue again > for the F22 cycle, in consultation with pjones if necessary, so we can > put a realistic requirement in place before we get into F22 Alphas. > > If no-one has any objections, we'll make the removal formal ahead of > tomorrow's Go/No-Go meeting for 21. Thanks folks! Gist: EFI GRUB still gets these legacy OS X boot options that were designed to permit CSM-BIOS GRUB to EFI boot OS X. They don't work from EFI GRUB though. As far as I can tell there's no upstream bandwidth/interest in fixing this; even if it means just suppressing the creation of the entries, rather than chainloading the Apple bootloader. So I think the issue is not a QA issue right now, but needs to be bounced back to desktop@ for the Workstation WG to maybe use some recruitment influence if they want to see this fixed. http://lists.gnu.org/archive/html/grub-devel/2014-10/msg00044.html A challenge with grub2-mkconfig creating an entry to chainload Apple's boot.efi, is with recent on-disk format changes in OS X 10.10 since this last October. It means os-prober will need to become aware that the boot.efi it's looking for is now on an Apple Boot [1] partition. I'm not sure what's involved in doing that work compared to just suppressing the creation of entries that don't work anyway. [1] 48465300-0000-11AA-AA11-00306543ECAC HFS+ partition type, no longer used except for external/removable media, this is what os-prober looks for today 426F6F74-0000-11AA-AA11-00306543ECAC Apple Boot partition type, is JHFS+ format, is where boot.efi is located 53746F72-6167-11AA-AA11-00306543ECAC Core Storage PV partition type, OS X's version of LVM, the LV OS X is on could be encrypted but in any case right now we can't mount the volume until we have Core Storage support on linux. -- Chris Murphy -- test mailing list test@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe: https://admin.fedoraproject.org/mailman/listinfo/test
