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

Drew --


Chris Sarcone writes:
You should be using IODMACommand. It works across 32-bit and 64-bit  

Eeek.

Where is IODMACommand documented?

Does HeaderDoc count? ;-). I think TechPubs is working on revamping the IOKit literature and providing some sample code for this.

Are network drivers still supposed to use IOMbufMemoryCursor?

IIRC, mbufs are special cased (they're allocated out of the special chunk of < 4GB memory). I'm not sure about the IOMbufMemoryCursor question. I think it depends on how you allocate your Rx/Tx ring buffers and such.

  Is there a technote or anything about this?  Example code?

I believe there is sample code for IODMACommand that is part of the Leopard seed. /Developer/Examples/IOKit/pci/AppleSamplePCI. I don't think it made the Xcode 2.4 release though...

-- Chris

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References: 
 >RE: Kernel panic on Intel based Mac with more than 2GB of memory (From: "Dave Canfield" <email@hidden>)
 >Re: Kernel panic on Intel based Mac with more than 2GB of memory (From: Chris Sarcone <email@hidden>)
 >Re: Kernel panic on Intel based Mac with more than 2GB of memory (From: Andrew Gallatin <email@hidden>)



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