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: Chris Sarcone <email@hidden>

Date: Fri, 6 Oct 2006 13:47:41 -0700

Delivered-to: email@hidden

Dave --

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

From the backtrace I can see that at the time of the panic the driver is

in the process of building a scatter/gather table in preperation for a
DMA transfer.

What I don't get is how our driver can be causing this problem since
getPhysicalSegment takes an offset instead of an address as an argument.
It seems to me that for our driver to be causing this problem it would
have to be passing a completely invalid offset argument, which I doubt
it is doing since the driver seems to work fine if the system has 2GB or
less of memory.

Anybody out there able to shed some light on what's going on here?

Are you using IODMACommand to build your S/G list or are you still using IOMemoryCursor?

-- Chris

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