Forcing Snow Leopard to use 64bit Kernel

September 13, 2009

How to force Snow Leopard to boot the 64 bit kernel, cause we all want to run the latest 64 bit goodness from Apple.

Open the file

/Library/Preferences/SystemConfiguration/com.apple.Boot.plist

with something like TextEdit and add arch=x86_64 to the Kernel Flags string:


<key>Kernel</key>
<string>mach_kernel</string>
<key>Kernel Flags</key>
<string>arch=x86_64</string>

This is posted just about everywhere, and is really only added here for my convenience.