When Apple dropped the 32-bit kernel entirely from OS X, starting with OS X 10.8 Mountain Lion, EFI32 Macs no longer had an Apple-supported mechanism to boot newer OS X versions. However, Apple did not support booting the 64-bit kernel in Macs that shipped with EFI32 firmware, even if they had 64-bit processors capable of running the 64-bit kernel. OS X 10.6 Snow Leopard was the first OS X version with optional support for a 64-bit kernel, allowing booting either with a 32-bit or 64-bit kernel. Once a new boot loader is used to launch the native 64-bit Yosemite kernel, OS X 10.10 boots and works normally exactly as it does on a 2008 Mac Pro or newer with EFI64 firmware. These 64-bit Mac Pros and Xserves have EFI32 firmware and can't natively boot OS X Yosemite "out-of-the-box", but are easily capable of running it with a different boot loader. Thanks Pike!Īpple does not support OS X Yosemite on the original 2006/2007 Mac Pro and 2006 Xserve. I know any amount is highly appreciated.Įven if you don't donate, you may consider simply thanking him via a comment on his blog, as he's done a lot of work without asking for anything in return or benefiting from this project. He's had a tough time with hardware and been developing all this time without access to an actual 2006/2007 Mac Pro! His donation page is in euros, where €20 is around $23 USD, and PayPal will show the actual conversion used at time of donation. If you find Pike's boot loader valuable in keeping your 2006/2007 Mac up-to-date, please consider donating to him as a thank you and to encourage future continued development. Lastly, if Pike's boot.efi boot loader was overwritten after an OS X update because you didn't take the precaution of installing the PikeYoseFix script, and you have a folder with question mark on boot, here is a link to instructions on how to restore Pike's boot.efi to restore the ability to boot. If you don't have PikeYoseFix script installed, or if you have OS X installed on a Fusion drive where the PikeYoseFix script doesn't work properly, you should disable "Install OS X updates" and "Install system data files and security updates" in System Preferences > App Store so that OS X doesn't automatically install any future updates that may overwrite Pike's boot.efi. It automatically runs at every system shutdown re-copying Pike's boot.efi to the proper locations just in case something like an OS X update overwrote it. Once the PikeYoseFix script is installed, it does not need to be installed again and it should be safe to install future OS X updates. reboot twice as the second boot is when the PikeYoseFix script is fully installed and executes!.prerequisite: an installed and working OS X Yosemite system with Pike's boot.efi.If you have OS X Yosemite up and running on your 2006/2007 Mac Pro with Pike's boot loader, this is how to make sure OS X Yosemite updates (like the OS X Yosemite 10.10.2 Update) don't break your ability to boot Yosemite: Hennesie2000's Guide for installing Yosemite on a Mac Pro 1,1 or 2,1 - the boot.efi method.Piker-Alpha bootloader boot.efi with either black or light grey background Apple boot screen (build 3b402a9).Simply looking to download the Piker-Alpha macosxbootloader? Links: This first post is usually updated with recent summarized information.
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