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And one more thing i need to know is, when i start my MacBook default it takes as 32-bit kernel mode because i did not change in com.apple.boot.plist or not holding 6 and 4 at boot time ok its fine.

In 32-bit mode if i change the project build settings Architectures" setting as "Standard (32/64-bit) Universal" and load this kext in 32-bit(it works fine). if i restart my MacBook and boot as 64-bit kernel(holding 6 and 4) the same kext works in 64-bit or not.otherwise i need to load the same kext(what i build in 32-bit kernel mode) in 64-bit kernel again?

What kernel architecture you're running is irrelevant at kext build time; you can build a kext for both 32-bit and 64-bit when booted either in the 32-bit kernel or the 64-bit kernel. Be sure to test both architectures of the kext. -Andrew _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... This email sent to site_archiver@lists.apple.com