32- or 64-bit Kernel Startup Mode Selector... Mac OS X 10.6 Snow Leopard is 64-bit - or is it?
Well, actually Mac OS X 10.6 Snow Leopard is both 32-bit and 64-bit, and what that means for you depends on both your hardware and your settings.
I put up an accompanying website which should answer most of your questions here.
What does this app do?
it shows whether you have a 32-bit or a 64-bit processor
it shows whether you have a 32-bit or a 64-bit EFI
it shows whether the MacOS X Kernel is set to boot in 32-bit or More...
What's New
Version 1.6:
NEW: updated info on new Mac models
NEW: added bug reporter (haven't heard of any bugs but since I added it to all my apps …)
Note: I had a report that the app ran fine on 10.5.8 but crashed on startup on 10.6 for one user. After two days of troubleshooting it turned out that the user had a kext which is NOT compatible with 10.6 in his system extension folder More...
Requirements
To check your configuration:
Intel Mac
Mac OS X 10.4 Tiger or later
To set the kernel\'s startup mode:
Intel Mac
MacOS X 10.6 Snow Leopard or higher
Admin rights (as a system file needs changing)
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32- or 64-bit Kernel Startup Mode Selector User Discussion
32- or 64-bit Kernel Startup Mode Selector... Mac OS X 10.6 Snow Leopard is 64-bit - or is it?
Well, actually Mac OS X 10.6 Snow Leopard is both 32-bit and 64-bit, and what that means for you depends on both your hardware and your settings.
I put up an accompanying website which should answer most of your questions here.
What does this app do?
it shows whether you have a 32-bit or a 64-bit processor
it shows whether you have a 32-bit or a 64-bit EFI
it shows whether the MacOS X Kernel is set to boot in 32-bit or in 64-bit mode
it shows whether the MacOS X Kernel is running in 32-bit or in 64-bit mode
it shows whether Apple officially supports booting a 64-bit kernel on your Mac
it allows you to select whether you want to start the MacOS X Kernel in 32-bit or in 64-bit mode (the setting might be ignored on MacBooks, depending on how Apple implements the restriction)
accompanying webpage explains what the whole commotion about 32-bit and 64-bit in MacOS X Snow Leopard is about
Requirements:
To check your configuration:
Intel Mac
Mac OS X 10.4 Tiger or higher
To set the kernel's startup mode:
Intel Mac
Mac OS X 10.6 Snow Leopard or higher
Admin rights (as a system file needs changing)
Version 1.6:
NEW: updated info on new Mac models
NEW: added bug reporter (haven't heard of any bugs but since I added it to all my apps …)
Note: I had a report that the app ran fine on 10.5.8 but crashed on startup on 10.6 for one user. After two days of troubleshooting it turned out that the user had a kext which is NOT compatible with 10.6 in his system extension folder (he had previously installed an app, removed it, but forgot to remove the kext). So if you should experience weird crashes with ANY app on 10.6 which ran fine on 10.5.x then make sure you do not have incompatible extensions left in the system folder.
32- or 64-bit Kernel Startup Mode Selector User Discussion
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