How to boot Snow Leopard as 64bit kernel?

[Wowzera]

I've seen something about com.apple.boot.plist, but I need a little more further information.

After type:

ioreg -p IODeviceTree -w0 -l | grep firmware-abi

I receive the following from terminal:

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

Looks that I am able to run 64 bit kernel.
My computer is a white macbook early 2008. Core 2 Duo T8300 2.4GHz.

If anyone can make a small guide, please!

 

[kropotov]

i hope after today's update (over 743mb) maby it will possible. not now.

 

[doctoree]

Some say you have to hold the 6 and 4 keys when booting (everytime you want 64bits) but its not working here for some reason...

 

[Riemann Zeta]

Make the new parameter "Kernel Flags" and give it the value "arch=x86_64" in the file com.apple.boot.plist (/Library/Preferences/SystemConfiguration/). Worked for me--no more holding 6+4 every boot; this is on a penryn MBP (early 2008, pre-NVIDIA chipset). Just in case, be sure to uninstall any third-party kernel-level drivers (kexts)--especially the logitech mouse driver packages.

 

[doctoree]

Make the new parameter "Kernel Flags" and give it the value "arch=x86_64" in the file com.apple.boot.plist (/Library/Preferences/SystemConfiguration/). Worked for me--no more holding 6+4 every boot; this is on a penryn MBP (pre-NVIDIA chipset).

Thanks for your quick response! I just want to test the 64bit mode once without messing in files. On my early 08 Penryn MBP holding the 6 and 4 keys (which is said to be booting into 64bit mode UNTIL the next reboot) doesn't work.

Edit: I have taken a look into this file and I wasn't able to figure out how to extend it with this new param. I'd appreciate a copy of how you inserted the code!

 

[Warbrain]

Some say you have to hold the 6 and 4 keys when booting (everytime you want 64bits) but its not working here for some reason...

That only enables it for those in the list of tested machines.

The flag in the plist is the best bet. I just wish I could tell if it actually worked.