Date: Thu, 31 Mar 2005 00:00:22 -0600 From: Jon Noack <noackjr@alumni.rice.edu> To: "Greg 'groggy' Lehey" <grog@FreeBSD.org> Cc: FreeBSD-amd64@FreeBSD.org Subject: Re: Problems with AMD64 and 8 GB RAM? Message-ID: <424B91F6.4000400@alumni.rice.edu> In-Reply-To: <20050331054911.GN6252@wantadilla.lemis.com> References: <20050330223546.GA4705@troutmask.apl.washington.edu> <20050330224445.GW84137@wantadilla.lemis.com> <200503311032.33718.doconnor@gsoft.com.au> <20050331015429.GH6252@wantadilla.lemis.com> <657eb6604d1e00368d77f047a8b5e074@FreeBSD.org> <20050331040811.GL6252@wantadilla.lemis.com> <424B7C74.4060203@samsco.org> <20050331051458.GM6252@wantadilla.lemis.com> <424B8A94.5070300@alumni.rice.edu> <424B8A4F.7050607@samsco.org> <20050331054911.GN6252@wantadilla.lemis.com>
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On 03/30/05 23:49, Greg 'groggy' Lehey wrote: > On Wednesday, 30 March 2005 at 22:27:43 -0700, Scott Long wrote: >>Jon Noack wrote: >>>On 03/30/05 23:14, Greg 'groggy' Lehey wrote: >>>>On Wednesday, 30 March 2005 at 21:28:36 -0700, Scott Long wrote: >>>>>Greg 'groggy' Lehey wrote: >>>>>>On Wednesday, 30 March 2005 at 23:01:03 -0500, John Baldwin wrote: >>>>>>>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? >>>>> >>>>>man acpidump >>>> >>>>How do you run that on a system that won't boot? >>> >>>You said the system worked with 4 GB (albeit detecting only 3.5 >>>GB). > > Yes, this is correct. A number of people have explained why it only > detected 3.5 GB in this configuration. > >>>My perception of this whole ACPI thing is that it is fixed in your >>>BIOS (although it can be overridden by the OS). As such, the >>>amount of RAM you have in the machine shouldn't change acpidump >>>results. Is that not correct? >> >>This is absolutely correct. > > Ah, so you meant to say that the output from the system running with 4 > GB memory is useful? That wasn't in the man page you pointed to. > What it does say is: > >>When invoked with the -t flag, the acpidump utility dumps contents of >>the following tables: >> >>... MADT > > This may be the case, but between man page and output some terminology > must have changed. I can't see any reference to anything like an MADT > there. Does that mean that there isn't one, or that ACPI can't find > it, or does the section APIC refer to/dump the MADT? Here's the > complete output of acpidump -t, anyway: > > <snip acpidump output> > > Since I don't know anything about ACPI, this doesn't say too much to > me. Suggestions welcome. If the APIC section is the MADT, it looks > as if we should update the docco. My limited research (as in, Google) shows that the MADT was defined as part of ACPI 2.0: http://www.microsoft.com/whdc/system/platform/64bit/IA64_ACPI.mspx According to your previous link the motherboard specs, it supports both ACPI 1.0A and 2.0. Perhaps there is a BIOS knob to toggle between the two? Jon
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