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k3nny

Unknown ACPI table

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Hi, beta v2.85.2454 shows an unknown ACPI table. I'm using an Asus P8Z77-V LK board with BIOS version 1001.

Debug output of the ACPI section:

--------[ ACPI ]--------------------------------------------------------------------------------------------------------

  [ Unknown ]

    ACPI Table Properties:
      Table Description                                 Unknown
      Memory Address                                    DB7D0018h
      Table Length                                      0 bytes
      OEM Revision                                      00000000h
      Creator Revision                                  00000000h

  [ APIC: Multiple APIC Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    APIC
      Table Description                                 Multiple APIC Description Table
      Memory Address                                    DD8DCE50h
      Table Length                                      114 bytes
      OEM ID                                            ALASKA
      OEM Table ID                                      A M I
      OEM Revision                                      01072009h
      Creator ID                                        AMI
      Creator Revision                                  00010013h
      Local APIC Address                                FEE00000h

    Processor Local APIC:
      ACPI Processor ID                                 01h
      APIC ID                                           00h
      Status                                            Enabled

    Processor Local APIC:
      ACPI Processor ID                                 02h
      APIC ID                                           02h
      Status                                            Enabled

    Processor Local APIC:
      ACPI Processor ID                                 03h
      APIC ID                                           04h
      Status                                            Enabled

    Processor Local APIC:
      ACPI Processor ID                                 04h
      APIC ID                                           06h
      Status                                            Enabled

    I/O APIC:
      I/O APIC ID                                       02h
      I/O APIC Address                                  FEC00000h
      Global System Interrupt Base                      00000000h

    Interrupt Source Override:
      Bus                                               ISA
      Source                                            IRQ0
      Global System Interrupt                           00000002h
      Polarity                                          Conforms to the specifications of the bus
      Trigger Mode                                      Conforms to the specifications of the bus

    Interrupt Source Override:
      Bus                                               ISA
      Source                                            IRQ9
      Global System Interrupt                           00000009h
      Polarity                                          Active High
      Trigger Mode                                      Level-Triggered

    Local APIC NMI:
      ACPI Processor ID                                 FFh
      Local ACPI LINT#                                  01h
      Polarity                                          Active High
      Trigger Mode                                      Edge-Triggered

  [ DSDT: Differentiated System Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    DSDT
      Table Description                                 Differentiated System Description Table
      Memory Address                                    DD8D2180h
      Table Length                                      43963 bytes
      OEM ID                                            ALASKA
      OEM Table ID                                      A M I
      OEM Revision                                      00000022h
      Creator ID                                        INTL
      Creator Revision                                  20051117h

    nVIDIA SLI:
      SLI Certification                                 812713457198Genuine NVIDIA Certified SLI Ready Motherboard for ASUS P8Z77-V LK     1513-Copyright 2011 NVIDIA Corporation All Rights Reserved-231089828765®
      PCI 0-0-0-0 (Direct I/O)                          8086-0150  (Intel)
      PCI 0-0-0-0 (HAL)                                 8086-0150  (Intel)

    Lucid Virtu:
      Virtu Certification                               Not Present

  [ FACP: Fixed ACPI Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    FACP
      Table Description                                 Fixed ACPI Description Table
      Memory Address                                    DD8D20F8h
      Table Length                                      132 bytes
      OEM ID                                            ALASKA
      OEM Table ID                                      A M I
      OEM Revision                                      01072009h
      Creator ID                                        AMI
      Creator Revision                                  00010013h
      FACS Address                                      DDA08040h
      DSDT Address                                      DD8D2180h
      SMI Command Port                                  000000B2h
      PM Timer                                          00000408h

  [ FACP: Fixed ACPI Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    FACP
      Table Description                                 Fixed ACPI Description Table
      Memory Address                                    00000000-DD8DCD40h
      Table Length                                      268 bytes
      OEM ID                                            ALASKA
      OEM Table ID                                      A M I
      OEM Revision                                      01072009h
      Creator ID                                        AMI
      Creator Revision                                  00010013h
      FACS Address                                      DDA08080h / 00000000-00000000h
      DSDT Address                                      DD8D2180h / 00000000-DD8D2180h
      SMI Command Port                                  000000B2h
      PM Timer                                          00000408h

  [ FACS: Firmware ACPI Control Structure ]

    ACPI Table Properties:
      ACPI Signature                                    FACS
      Table Description                                 Firmware ACPI Control Structure
      Memory Address                                    DDA08040h
      Table Length                                      64 bytes
      Hardware Signature                                D7010A01h
      Waking Vector                                     00000000h
      Global Lock                                       00000000h

  [ FBPT: Firmware Basic Boot Performance Table ]

    ACPI Table Properties:
      ACPI Signature                                    FBPT
      Table Description                                 Firmware Basic Boot Performance Table
      Memory Address                                    00000000-DE6D5038h
      Table Length                                      56 bytes

  [ FPDT: Firmware Performance Data Table ]

    ACPI Table Properties:
      ACPI Signature                                    FPDT
      Table Description                                 Firmware Performance Data Table
      Memory Address                                    DD8DCEC8h
      Table Length                                      68 bytes
      OEM ID                                            ALASKA
      OEM Table ID                                      A M I
      OEM Revision                                      01072009h
      Creator ID                                        AMI
      Creator Revision                                  00010013h
      FBPT Address                                      00000000-DE6D5038h
      S3PT Address                                      00000000-DE6D5018h

  [ HPET: IA-PC High Precision Event Timer Table ]

    ACPI Table Properties:
      ACPI Signature                                    HPET
      Table Description                                 IA-PC High Precision Event Timer Table
      Memory Address                                    DD8DCF50h
      Table Length                                      56 bytes
      OEM ID                                            ALASKA
      OEM Table ID                                      A M I
      OEM Revision                                      01072009h
      Creator ID                                        AMI.
      Creator Revision                                  00000005h
      HPET Address                                      00000000-FED00000h
      Vendor ID                                         8086h
      Revision ID                                       01h
      Number of Timers                                  8
      Counter Size                                      64-bit
      Minimum Clock Ticks                               14318
      Page Protection                                   No Guarantee
      OEM Attribute                                     0h
      LegacyReplacement IRQ Routing                     Supported

  [ MCFG: Memory Mapped Configuration Space Base Address Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    MCFG
      Table Description                                 Memory Mapped Configuration Space Base Address Description Table
      Memory Address                                    DD8DCF10h
      Table Length                                      60 bytes
      OEM ID                                            ALASKA
      OEM Table ID                                      A M I
      OEM Revision                                      01072009h
      Creator ID                                        MSFT
      Creator Revision                                  00000097h
      Config Space Address                              00000000-F8000000h
      PCI Segment                                       0000h
      Start Bus Number                                  00h
      End Bus Number                                    3Fh

  [ RSD PTR: Root System Description Pointer ]

    ACPI Table Properties:
      ACPI Signature                                    RSD PTR
      Table Description                                 Root System Description Pointer
      Memory Address                                    000FF000h
      Table Length                                      36 bytes
      OEM ID                                            ALASKA
      RSDP Revision                                     2  (ACPI 2.0+)
      RSDT Address                                      DD8D2028h
      XSDT Address                                      00000000-DD8D2078h

  [ RSDT: Root System Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    RSDT
      Table Description                                 Root System Description Table
      Memory Address                                    DD8D2028h
      Table Length                                      68 bytes
      OEM ID                                            ALASKA
      OEM Table ID                                      A M I
      OEM Revision                                      01072009h
      Creator ID                                        MSFT
      Creator Revision                                  00010013h
      RSDT Entry #0                                     DD8D20F8h  (FACP)
      RSDT Entry #1                                     DD8DCE50h  (APIC)
      RSDT Entry #2                                     DD8DCEC8h  (FPDT)
      RSDT Entry #3                                     DD8DCF10h  (MCFG)
      RSDT Entry #4                                     DD8DCF50h  (HPET)
      RSDT Entry #5                                     DD8DCF88h  (SSDT)
      RSDT Entry #6                                     DD8DD2F8h  (SSDT)
      RSDT Entry #7                                     DD8DDCA8h  (SSDT)

  [ S3PT: S3 Performance Table ]

    ACPI Table Properties:
      ACPI Signature                                    S3PT
      Table Description                                 S3 Performance Table
      Memory Address                                    00000000-DE6D5018h
      Table Length                                      32 bytes

  [ SSDT: Secondary System Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    SSDT
      Table Description                                 Secondary System Description Table
      Memory Address                                    DD865018h
      Table Length                                      2107 bytes
      OEM ID                                            PmRef
      OEM Table ID                                      Cpu0Cst
      OEM Revision                                      00003001h
      Creator ID                                        INTL
      Creator Revision                                  20051117h

  [ SSDT: Secondary System Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    SSDT
      Table Description                                 Secondary System Description Table
      Memory Address                                    DD866A98h
      Table Length                                      771 bytes
      OEM ID                                            PmRef
      OEM Table ID                                      ApIst
      OEM Revision                                      00003000h
      Creator ID                                        INTL
      Creator Revision                                  20051117h

  [ SSDT: Secondary System Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    SSDT
      Table Description                                 Secondary System Description Table
      Memory Address                                    DD867C18h
      Table Length                                      281 bytes
      OEM ID                                            PmRef
      OEM Table ID                                      ApCst
      OEM Revision                                      00003000h
      Creator ID                                        INTL
      Creator Revision                                  20051117h

  [ SSDT: Secondary System Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    SSDT
      Table Description                                 Secondary System Description Table
      Memory Address                                    DD8DCF88h
      Table Length                                      877 bytes
      OEM ID                                            SataRe
      OEM Table ID                                      SataTabl
      OEM Revision                                      00001000h
      Creator ID                                        INTL
      Creator Revision                                  20091112h

  [ SSDT: Secondary System Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    SSDT
      Table Description                                 Secondary System Description Table
      Memory Address                                    DD8DD2F8h
      Table Length                                      2474 bytes
      OEM ID                                            PmRef
      OEM Table ID                                      Cpu0Ist
      OEM Revision                                      00003000h
      Creator ID                                        INTL
      Creator Revision                                  20051117h

  [ SSDT: Secondary System Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    SSDT
      Table Description                                 Secondary System Description Table
      Memory Address                                    DD8DDCA8h
      Table Length                                      2706 bytes
      OEM ID                                            PmRef
      OEM Table ID                                      CpuPm
      OEM Revision                                      00003000h
      Creator ID                                        INTL
      Creator Revision                                  20051117h

  [ XSDT: Extended System Description Table ]

    ACPI Table Properties:
      ACPI Signature                                    XSDT
      Table Description                                 Extended System Description Table
      Memory Address                                    00000000-DD8D2078h
      Table Length                                      100 bytes
      OEM ID                                            ALASKA
      OEM Table ID                                      A M I
      OEM Revision                                      01072009h
      Creator ID                                        AMI
      Creator Revision                                  00010013h
      XSDT Entry #0                                     00000000-DD8DCD40h  (FACP)
      XSDT Entry #1                                     00000000-DD8DCE50h  (APIC)
      XSDT Entry #2                                     00000000-DD8DCEC8h  (FPDT)
      XSDT Entry #3                                     00000000-DD8DCF10h  (MCFG)
      XSDT Entry #4                                     00000000-DD8DCF50h  (HPET)
      XSDT Entry #5                                     00000000-DD8DCF88h  (SSDT)
      XSDT Entry #6                                     00000000-DD8DD2F8h  (SSDT)
      XSDT Entry #7                                     00000000-DD8DDCA8h  (SSDT)



However, "CpuPm" includes additional SSDT tables where the unknown table at address 0xDB7D0018 is defined as "CPU0IST".

        Name (SSDT, Package (0x0C)
        {
            "CPU0IST ", 
            0xDB7D0018, 
            0x000009AA, 
            "APIST   ", 
            0xDD866A98, 
            0x00000303, 
            "CPU0CST ", 
            0xDD865018, 
            0x0000083B, 
            "APCST   ", 
            0xDD867C18, 
            0x00000119
        })

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Such 0-byte long tables are usually there because of either a BIOS bug, or because of a disabled ACPI table (e.g. HPET).  The memory address matching with other tables could just be a coincidence.

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