Re: [Bug 96692] Re: ata_piix used instead of AHCI for Mac Pro
Christian Kellner wrote: There exists a work-around by patching grub stage1. Find the patch and the binary here: http://boeglin.org/blog/. I did it here and its working like a charm. This is a neat hack. If I get a morning or afternoon clear (with a boot disc handy), I might try it. I hacked on trying to do it via initramfs, but I think the PCI configuration was locked down at that point (no changes I made to the controller would stick). I still wish there were a good long-term solution for the kernel. If it was as simple as writing some smart detection code, I'd do it. But it appears the hardest part of the problem is understanding just what Apple did to the hardware classification that makes it incompatible with the standard IDs. -- Shaw Terwilliger `echo sterwill1tinfig2com | tr 12 @.` -- ata_piix used instead of AHCI for Mac Pro https://bugs.launchpad.net/bugs/96692 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 96692] Re: ata_piix used instead of AHCI for Mac Pro
Matthew Garrett wrote: The firmware programs the sata controller into piix mode, not ahci mode. On this specific hardware, the ahci driver is able to reprogram it - however, that isn't guaranteed in general, and attempts to do so have led to unfortunate behaviour like missing CD drives. Right now, the easiest thing to do would be to convince Apple to program the device into AHCI mode. I doubt convincing Apple to release new firmware will be easy, even if it's the best solution. I have no idea how to go about that. Adding a single line to ahci.c is definitely easy, though it may be a hack. With a status of Wishlist, we'll have another Ubuntu release where this problem will be left unsolved. This is an old bug (actually a regression--it used to work!) and I wish it could be solved in a way that didn't require constant kernel patching on the behalf of all Mac Pro users. -- Shaw Terwilliger `echo sterwill1io2nu | tr 12 @.` -- ata_piix used instead of AHCI for Mac Pro https://bugs.launchpad.net/bugs/96692 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 96692] Re: ata_piix used instead of AHCI for Mac Pro
Matthew Garrett wrote: Just adding the ID to ahci.c would break a large number of other machines, so while easy it's not possible. I spent a few hours one day trying to reprogram the controller using setpci from initramfs and didn't have any luck. It appeared that once the controller had its mode set (by the Apple firmware?), the registers were read-only. A boot-time solution like this would make me very happy as a Mac Pro user, if it were possible (and it may be). I'd volunteer to write/submit/maintain a Mac Pro AHCI package that provided the initramfs scripts in this case. -- Shaw Terwilliger `echo sterwill1io2nu | tr 12 @.` -- ata_piix used instead of AHCI for Mac Pro https://bugs.launchpad.net/bugs/96692 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 96692] Re: ata_piix used instead of AHCI for Mac Pro
Stephen Touset wrote: Has this been fixed? It was reported that there was a patch in testing, but I've seen no activity since. This seems to still be in Gutsy. The bug is still present in Gutsy as of a previous beta (I'm about 2 months out-of-date). I can retest this week with the latest kernel, but as far as I know it was never fixed in a released Ubuntu kernel. -- Shaw Terwilliger `echo sterwill1io2nu | tr 12 @.` -- ata_piix used instead of AHCI for Mac Pro https://bugs.launchpad.net/bugs/96692 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
