![]() Wanting to run a 64-bit kernel for testing and debugging, this may not The kernel, when running, would not be able to use firmware services. Although a 32-bit EFI could launch a 64-bit kernel, The first limitation actually does have merit and is arguably not all (A cursory look suggests thatīoth of these "limitations" are technically artificial, albeit to The machine’s model is prohibited from booting K64 through a hardcoded list within the boot loader.Out of theīox, boot.efi will not boot K64 even if you have a 64-bit processorĪnd explicitly request K64 if at least one of the following is true. Unfortunately, a 64-bit processor alone doesn’t suffice. Here's the part I found most relevant to your question: See Mac OS X Internals - Is Your Machine Good Enough for Snow Leopard K64? His post mentions Snow Leopard (10.6), but the issues would be similar for 10.7. I found a post on the subject from the guy who wrote this book about Mac OS X internals.
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