Print nvram settings
# nvram -p
Set boot-args to use 64 bit kernel
# nvram boot-args="arch=x86_64"
Don’t forget to add in your existing boot-args to the command above. Using nvram means you don’t need to have to remember to hold down 6 or 4 during booting each time. To go back to the 32 bit kernel, just set the boot-args using nvram without the arch=x86_64 option.
Check if running 64 bit kernel
To check if you’re using the 64 bit kernel, you can run uname -v and check if there is mention of x86_64 in the returned string.
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