From 64-Bit Transition Guide: Kernel Extensions and Drivers:

Quote:
In both client and server versions, you can boot supported computers into 64-bit mode by holding down the 6 and 4 keys at startup time or by adding arch=x86_64 to your boot-args string using the nvram command.

You can also set the machine to boot into 32- or 64-bit mode on the next boot with

systemsetup -setkernelbootarchitecture i386 or systemsetup -setkernelbootarchitecture x86_64

as noted in man systemsetup.


dkmarsh—member, FineTunedMac Co-op Board of Directors