Re: Kernel panic on Intel based Mac with more than 2GB of memory

Or, you can use IOBufferMemoryDescriptor::inTaskWithPhysicalAddress() to allocate your DMA buffers, and you can pass a mask to restrict them to be allocated in 32-bit physical address space.  This is particularly important if your DMA hardware only supports 32 bit physical addresses.  One nice thing about this is that you don't have to change any of your IOMemoryCursor code (and update to IODMACursor), it just works.  Also, this is nice if you need to support older (PPC) systems.  You can just call inTaskWithPhysicalAddress() if compiling for Intel, and then require 10.4.8 on the Intel side (this API is present on all Intel systems as of 10.4.8).  On the PPC side you just leave it as it was.  Then you can have a single universal binary.