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10.6: How to boot into the 64-bit kernel
Authored by: Crazor on Sep 16, '09 04:41:16AM
If your Mac hardware is capable, but Apple doesn't want you to run K64, there is a way to patch the boot.efi: http://www.osxbook.com/blog/2009/08/31/is-your-machine-good-enough-for-snow-leopard-k64/

With this patch, I'm able to run K64 on my late 2008 unibody MacBook just fine, no problems yet. Note that while Amit Singh lists the offsets for other models than the MacBook, he hasn't tested them yet (and me neither).

I used HexEdit for the patching (remember selecting and then overwriting the byte, inserting a byte will damage the file). If you don't want to patch the offsets yourself, there's a ready-made boot.efi here: http://netkas.org/?p=189
Note: either did netkas only patch the location for MacBooks or the patch as described by Amit Singh does not work on other Macs. At least that is what I read from netkas' post.

Maybe this should be run as a hint on it's own...

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