Re: Problems with AMD64 and 8 GB RAM?

From: Jon Noack (noackjr_at_alumni.rice.edu)
Date: 03/31/05

  • Next message: Greg 'groggy' Lehey: "Re: Problems with AMD64 and 8 GB RAM?" 
    Date: Thu, 31 Mar 2005 00:00:22 -0600
To: "Greg 'groggy' Lehey" <grog@FreeBSD.org>

    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
    _______________________________________________
    freebsd-stable@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-stable
    To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"

  • Next message: Greg 'groggy' Lehey: "Re: Problems with AMD64 and 8 GB RAM?"

    Relevant Pages