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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RE[2]: Wrong zealot!!!
by Hakime on Wed 19th Aug 2009 12:40 UTC in reply to "RE: Wrong zealot!!!"
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Here are some relevant Apple's documentation for developers for writing 64 bits apps on Leopard:

I guess everything is said now.... Note that it also possible to have 32 bits drivers communicating with 64 bits apps. Pretty neat...

I can't link to the documentation for building universal drivers and KEXTs as it is relevant to snow leopard and still under NDA.

Edited 2009-08-19 12:44 UTC

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