Linked by Thom Holwerda on Tue 18th Aug 2009 18:46 UTC
Mac OS X Even though Apple has been hyping up the 64bit nature of its ucpoming Snow Leopard operating system, stating it will be the first Mac OS X release to be 64bit top-to-bottom, reality turns out to be a little bit different so far. With the current Snow Leopard seed, only Xserve users get the 64bit kernel and drivers - all other Macs default to 32bit. By holding down the '6' and '4' keys during boot, you can to boot into full 64bit mode - that is, if your Mac supports it. As it turns out, some Macs with 64bit processors cannot use the 64bit kernel because the EFI is 32bit. Note: I should have included in the article that 64bit applications will run just fine (including benefits) on a 32bit kernel in Mac OS X. Since this was already possible in Leopard, I assumed people were well aware of that. Turns out some were not, so my apologies for that.
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Tested on my Early 2008 Whitebook
by fx__ on Tue 18th Aug 2009 20:53 UTC
fx__
Member since:
2006-03-31

Tried running the command on my MacBook (Early 2008)

littlemac:~ fx$ ioreg -l -p IODeviceTree | grep firmware-abi
| | "firmware-abi" = <"EFI64">
littlemac:~ fx$

Reply Score: 1

Thom_Holwerda Member since:
2005-06-29

MacBooks cannot boot the current Snow Leopard build, whether they have 64bit EFI or not. The article states it quite clearly.

Reply Parent Score: 1