Re: Problems with AMD64 and 8 GB RAM?

From: Greg 'groggy' Lehey (grog_at_FreeBSD.org)
Date: 03/31/05

  • Next message: Jon Noack: "Re: Problems with AMD64 and 8 GB RAM?" 
    Date: Thu, 31 Mar 2005 15:19:11 +0930
To: Scott Long <scottl@samsco.org>

    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:

    /*
      RSD PTR: OEM=VIAK8, ACPI_Rev=1.0x (0)
            RSDT=0xdfee3000, cksum=97
     */
    /*
      RSDT: Length=44, Revision=1, Checksum=4,
            OEMID=VIAK8, OEM Table ID=AWRDACPI, OEM Revision=0x42302e31,
            Creator ID=AWRD, Creator Revision=0x0
            Entries={ 0xdfee3040, 0xdfee7b40 }
     */
    /*
      FACP: Length=116, Revision=1, Checksum=255,
            OEMID=VIAK8, OEM Table ID=AWRDACPI, OEM Revision=0x42302e31,
            Creator ID=AWRD, Creator Revision=0x0
            FACS=0xdfee0000, DSDT=0xdfee30c0
            INT_MODEL=PIC
            Preferred_PM_Profile=Unspecified (0)
            SCI_INT=9
            SMI_CMD=0x402f, ACPI_ENABLE=0xa1, ACPI_DISABLE=0xa0, S4BIOS_REQ=0x0
            PSTATE_CNT=0x0
            PM1a_EVT_BLK=0x4000-0x4003
            PM1a_CNT_BLK=0x4004-0x4005
            PM_TMR_BLK=0x4008-0x400b
            GPE0_BLK=0x4020-0x4023
            P_LVL2_LAT=101 us, P_LVL3_LAT=1001 us
            FLUSH_SIZE=0, FLUSH_STRIDE=0
            DUTY_OFFSET=0, DUTY_WIDTH=1
            DAY_ALRM=125, MON_ALRM=126, CENTURY=50
            IAPC_BOOT_ARCH=
            Flags={WBINVD,PROC_C1,SLP_BUTTON,RTC_S4,RESET_REG}
            RESET_REG=0x00000000:0[0] (Memory), RESET_VALUE=0x44
     */
    /*
      FACS: Length=64, HwSig=0x00000000, Firm_Wake_Vec=0x00000000
            Global_Lock=
            Flags=
            Version=0
     */
    /*
      DSDT: Length=19020, Revision=1, Checksum=28,
            OEMID=VIAK8, OEM Table ID=AWRDACPI, OEM Revision=0x1000,
            Creator ID=MSFT, Creator Revision=0x100000e
     */
    /*
      APIC: Length=104, Revision=1, Checksum=145,
            OEMID=VIAK8, OEM Table ID=AWRDACPI, OEM Revision=0x42302e31,
            Creator ID=AWRD, Creator Revision=0x0
            Local APIC ADDR=0xfee00000
            Flags={PC-AT}

            Type=Local APIC
            ACPI CPU=0
            Flags={ENABLED}
            APIC ID=0

            Type=Local APIC
            ACPI CPU=1
            Flags={ENABLED}
            APIC ID=1

            Type=IO APIC
            APIC ID=2
            INT BASE=0
            ADDR=0x00000000fec00000

            Type=INT Override
            BUS=0
            IRQ=0
            INTR=2
            Flags={Polarity=conforming, Trigger=conforming}

            Type=INT Override
            BUS=0
            IRQ=9
            INTR=9
            Flags={Polarity=active-lo, Trigger=level}

            Type=Local NMI
            ACPI CPU=0
            LINT Pin=1
            Flags={Polarity=active-hi, Trigger=edge}

            Type=Local NMI
            ACPI CPU=1
            LINT Pin=1
            Flags={Polarity=active-hi, Trigger=edge}
     */

    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.

    Greg 

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