site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com 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 -- Michael David Crawford mdcrawford at gmail dot com Enjoy my art, photography, music and writing at http://www.geometricvisions.com/ --- Free Music Downloads --- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/ssen%40apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... Mac OS X uses a 32-bit kernel on both 32-bit and 64-bit capable processors. This email sent to ssen@apple.com This email sent to site_archiver@lists.apple.com