Re: Can I boot 32-bit on a Mac with more than 4 Gb of RAM?
Re: Can I boot 32-bit on a Mac with more than 4 Gb of RAM?
- Subject: Re: Can I boot 32-bit on a Mac with more than 4 Gb of RAM?
- From: Shantonu Sen <email@hidden>
- Date: Wed, 14 Nov 2007 21:06:01 -0800
Mac OS X uses a 32-bit kernel on both 32-bit and 64-bit capable
processors.
You can simulate reducing memory to 512MB with
sudo nvram boot-args="maxmem=512"
Shantonu Sen
On Nov 14, 2007, at 8:12 PM, Michael Crawford wrote:
Is there a way to make a Mac that has more than 4 gigabytes of RAM
boot in 32-bit mode? Such as an nvram boot-args setting?
That would of course mean that some RAM becomes inaccessible.
I want to do this to ease test coverage for the QA of my driver, so
that I can leave all the memory installed in my ordinarily 64-bit Mac,
but test my driver running under a 32-bit kernel.
Note that anytime one removes or adds memory, there is some risk of
damaging either the memory module or the motherboard, due to static
electricity and the like.
Thanks!
Mike
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