Jump to content

How to boot 10.5.8 in 64-bit mode?


4 posts in this topic

Recommended Posts

Well, I tried to find the solution but with no luck.

My PC has 64-bit CPU Q6600 and 64-bit EFI.


I've edited com.apple.Boot.plist and added the string:

<key>Kernel Flags</key>



Check with Terminal:


ioreg -l -p IODeviceTree | grep firmware-abi

| | "firmware-abi" = <"EFI64">


but after I type:

uname -a


I have an answer:

root:xnu-1228.15.4~1/RELEASE_I386 i386


Is it mean 32-bit?


I believe that someone or even many of us has a successful experience. Please, share it.



My configuration:

Chameleon RC4

Mac OS X 10.5.8 Retail

Intel Bad Axe 2 Motherboard



NVidia Quadro 3500

SATA Drives


Link to comment
Share on other sites

The kernel flag you're using is for Snow Leopard. 10.5.x doesn't have a full 64-bit mode like Snow Leopard has.


Unless you boot 10.5.x with the -legacy kernel flag, it's already as 64-bit as it can be.


Open Activity monitor and start Chess (it's in Applications). If it says Chess is running in 64-bit mode you're fine.

Link to comment
Share on other sites

  • 1 month later...

  • Create New...