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View Full Version : No 64bit kernel boot on late 2010 MBA?




double329
Jan 10, 2011, 08:44 AM
Has anyone tried or have any luck getting a new MBA to boot with 64bit kernel? I did a search in this forum. It sounded like no one has any luck since 09. I tried the step provided by Apple and other site, but no luck. My MBA is still booting with 32bit kernel???

http://support.apple.com/kb/HT3773



gglockner
Jan 10, 2011, 10:33 AM
Not all Macs support the 64-bit kernel - including several Macs currently in production. Here is the full list from Apple:

http://support.apple.com/kb/HT3770

fyrefly
Jan 10, 2011, 02:58 PM
It seems like it's an artificial EFI limitation put in place by Apple.

The Processors in the 2010 MBA lineup are 64-bit capable, so I don't see why it wouldn't boot in 64-bit unless Apple has specifically prevented it.

That being said, from what I've read, there's not a lot of benefit to booting in 64-bit unless you're trying to address memory above 4GB (which you can't do on a MBA).

gnasher729
Jan 10, 2011, 03:11 PM
It seems like it's an artificial EFI limitation put in place by Apple.

The Processors in the 2010 MBA lineup are 64-bit capable, so I don't see why it wouldn't boot in 64-bit unless Apple has specifically prevented it.

That being said, from what I've read, there's not a lot of benefit to booting in 64-bit unless you're trying to address memory above 4GB (which you can't do on a MBA).

32 bit kernel will handle 8 or 16 GB just fine. It's only when you have tons of memory (like 64 GB or more) where 64 bit kernel would make a difference.

double329
Jan 10, 2011, 04:27 PM
The MBA boot with 32 bit kernel. The 64bit app can still run on the 32bit kernel as 64bit app. The thing is: some 64 bit app will run as 32 bit mode unless you tell the app to run as 64bit. Adobe LightRoom is one of them. I had to tell the app to run at 64bit mode. I am sure there will be other apps like that. The point here is: if I have 64bit system, I want to run it as 64 bit :rolleyes:

gglockner
Jan 10, 2011, 04:50 PM
The MBA boot with 32 bit kernel. The 64bit app can still run on the 32bit kernel as 64bit app.

+1. This is what I do all the time. To paraphrase Steve Jobs: "Not that big of a deal".

2IS
Jan 10, 2011, 07:27 PM
Are any Apple flaws a big deal as far as Jobs is concerned?