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

Subject: Re: Kernel panic on Intel based Mac with more than 2GB of memory
From: Garth Cummings <email@hidden>
Date: Fri, 6 Oct 2006 14:01:10 -0700
Delivered-to: email@hidden
Delivered-to: email@hidden

Hi Dave,

On Oct 6, 2006, at 1:33 PM, Dave Canfield wrote:

We have a universal binary driver for a SATA HBA that seems to work fine
unless its running on an Intel Mac with more than 2GB of memory
installed. If there is more than 2GB of memory the system eventually
will panic with the following message in the panic log:

panic(cpu 3 caller 0x003A1D25): getPhysicalSegment() out of 32b range
0x100000000, len 0x8000, class IOGeneralMemoryDescriptor

The problem is that getPhysicalSegment returns a 32 bit address. The panic means that the physical address won't fit in 32 bits, which is the case on Mac Pro systems with more than 2.5 GB of physical memory.

Depending on what you're doing, you need to move to using IODMACommand, or use getPhysicalSegment64. These functions are new as of the Mac Pro but work on all 64-bit capable machines as of 10.4.8.

If you need to support machines older than 10.4.8 (duh!) you'll need to have a KEXT that uses the old API that loads on those systems and a separate KEXT that uses the new API for newer systems. Each KEXT will have to have its own CFBundleIdentifier, and one KEXT can live in the PlugIns directory within the other for ease of installation. Use the OSBundleLibraries version numbers to control which KEXT loads on which OS versions.

If you drop a line to <email@hidden> we can get you a sample PCI driver that shows how to use IODMACommand.

--gc

____________________________________________________________________

Garth Cummings email@hidden

Sr. Software Engineer

Apple Developer Technical Support

<http://developer.apple.com/technicalsupport>

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Follow-Ups:
- AppleSamplePCI sample showing use of IODMACommand
  - From: Garth Cummings <email@hidden>
- 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: Jim Wintermyre <email@hidden>

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

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