Problems with AMD64 and 8 GB RAM?

Greg 'groggy' Lehey grog at
Wed Mar 30 20:08:16 PST 2005

On Wednesday, 30 March 2005 at 23:01:03 -0500, John Baldwin wrote:
> On Mar 30, 2005, at 8:54 PM, Greg 'groggy' Lehey wrote:
>>> lapic0: LINT1 trigger: edge
>>> lapic0: LINT1 polarity: high
>>> lapic1: Routing NMI -> LINT1
>>> lapic1: LINT1 trigger: edge
>>> lapic1: LINT1 polarity: high
>>> -ioapic0 <Version 0.3> irqs 0-23 on motherboard
>>> +ioapic0 <Version 0.0> irqs 0-23 on motherboard
>>> cpu0 BSP:
>>>      ID: 0x00000000   VER: 0x00040010 LDR: 0x01000000 DFR: 0x0fffffff
>>>   lint0: 0x00010700 lint1: 0x00000400 TPR: 0x00000000 SVR: 0x000001ff
> This shows that in the - case the APIC is broken somehow (0.0 isn't a
> valid I/O APIC version). 

You mean the + case, I suppose.  Yes, that's what I suspected.

> It would seem that the system has mapped RAM over top of the I/O
> APIC perhaps?

That's what I suspected too, but imp doesn't think so.

> It would be interesting to see the contents of your MADT to see if
> it's trying to use a 64-bit PA for your APIC.

Any suggestions about how to do so?

See complete headers for address and phone numbers.
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