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Intel Desktop BIOS POST Codes, including models:

D102GGC2, D201GLY, D201GLY2, D5400XS, D945GBO, D945GCCR, D945GCL, D945GCLF, D945GCLF2, D945GCNL, D945GCPE, D945GCZ, D945GNT, D945GPM, D945GRW, D945GTP, D945PAW, D945PDK, D945PLNM, D945PLRN, D945PSN, D945PVS, D945PWM, D946GZAB, D946GZIS, D946GZTS, D955XBK, D955XCS, D975XBX, D975XBX2, DG31GL, DG31PR, DG33BU, DG33FB, DG33TL, DG35EC, DG41TY, DG43NB, DG45FC, DG45ID, DG965MQ, DG965MS, DG965OT, DG965PZ, DG965RY, DG965SS, DG965WH, DP35DP, DP43TF, DP45SG, DP965LT, DQ35JO, DQ35MP, DQ45CB, DQ45EK, DQ963FX, DQ965CO, DQ965GF, DQ965WC, DX38BT, DX48BT2

    Ranges:

  • 00 to 0F - Debug codes: Can be used by any PEIM/driver for debug.
  • 10 to 1F - Host Processors: 1F is an unrecoverable CPU error.
  • 20 to 2F - Memory/Chipset: 2F is no memory detected or no useful memory detected.
  • 30 to 3F - Recovery: 3F indicated recovery failure.
  • 40 to 4F - Reserved for future use.
  • 50 to 5F - I/O Busses: PCI, USB, ISA, ATA, etc. 5F is an unrecoverable error. Start with PCI.
  • 60 to 6F - Reserved for future use (for new busses).
  • 70 to 7F - Output Devices: All output consoles. 7F is an unrecoverable error.
  • 80 to 8F - Reserved for future use (new output console codes).
  • 90 to 9F - Input devices: Keyboard/Mouse. 9F is an unrecoverable error.
  • A0 to AF - Reserved for future use (new input console codes).
  • B0 to BF - Boot Devices: Includes fixed media and removable media. BF is an unrecoverable error.
  • C0 to CF - Reserved for future use.
  • D0 to DF - Boot device selection.
  • E0 to EE - Miscellaneous codes
  • EF - boot/S3 resume failure
  • F0 to FF - processor exception

  • Host Processor:

  • 10 Power-on initialization of the host processor (Boot Strap Processor)
  • 11 Host processor Cache initialization (including APs)
  • 12 Starting Application processor initialization
  • 13 SMM initialization

  • Chipset:

  • 21 Initializing a chipset component

  • Memory:

  • 22 Reading SPD from memory DIMMs
  • 23 Detecting presence of memory DIMMs
  • 24 Programming timing parameters in the memory controller and the DIMMs
  • 25 Configuring memory
  • 26 Optimizing memory settings
  • 27 Initializing memory, such as ECC init
  • 28 Testing memory

  • PCI Bus:

  • 50 Enumerating PCI busses
  • 51 Allocating resources to PCI bus
  • 52 Hot Plug PCI controller initialization
  • 53 57 Reserved for PCI Bus

  • USB:

  • 58 Resetting USB bus
  • 59 Reserved for USB

  • ATA/ATAPI/SATA:

  • 5A Resetting PATA/SATA bus and all devices
  • 5B Reserved for ATA

  • SMBus:

  • 5C Resetting SMBUS
  • 5D Reserved for SMBUS

  • Local Console:

  • 70 Resetting the VGA controller
  • 71 Disabling the VGA controller
  • 72 Enabling the VGA controller

  • Remote Console:

  • 78 Resetting the console controller
  • 79 Disabling the console controller
  • 7A Enabling the console controller

  • Keyboard (PS2 or USB):

  • 90 Resetting keyboard
  • 91 Disabling keyboard
  • 92 Detecting presence of keyboard
  • 93 Enabling the keyboard
  • 94 Clearing keyboard input buffer
  • 95 Instructing keyboard controller to run Self Test (PS2 only)

  • Mouse (PS2 or USB):

  • 98 Resetting mouse
  • 99 Disabling mouse
  • 9A Detecting presence of mouse
  • 9B Enabling mouse

  • Fixed Media:

  • B0 Resetting fixed media
  • B1 Disabling fixed media
  • B2 Detecting presence of a fixed media (IDE hard drive detection etc.)
  • B3 Enabling/configuring a fixed media

  • Removable media:

  • B8 Resetting removable media
  • B9 Disabling removable media
  • BA Detecting presence of a removable media (IDE, CD-ROM detection, etc.)
  • BC Enabling/configuring a removable media
  • BDS
  • Dy Trying boot selection y (y=0 to 15)

  • PEI Core:

  • E0 Started dispatching PEIMs (emitted on first report of EFI_SW_PC_INIT_BEGIN EFI_SW_PEI_PC_HANDOFF_TO_NEXT)
  • E2 Permanent memory found
  • E1, E3 Reserved for PEI/PEIMs

  • DXE Core:

  • E4 Entered DXE phase
  • E5 Started dispatching drivers
  • E6 Started connecting drivers

  • DXE Drivers:

  • E7 Waiting for user input
  • E8 Checking password
  • E9 Entering BIOS setup
  • EB Calling Legacy Option ROMs

  • Runtime Phase/EFI OS Boot:

  • F4 Entering Sleep state
  • F5 Exiting Sleep state
  • F8 EFI boot service ExitBootServices ( ) has been called
  • F9 EFI runtime service SetVirtualAddressMap ( ) has been called
  • FA EFI runtime service ResetSystem ( ) has been called

  • PEIMs/Recovery:

  • 30 Crisis Recovery has initiated per User request
  • 31 Crisis Recovery has initiated by software (corrupt flash)
  • 34 Loading recovery capsule
  • 35 Handing off control to the recovery capsule
  • 3F Unable to recover

  • Typical POST Sequence:

  • 21 - Initializing a chipset component
  • 22 - Reading SPD from memory DIMMs
  • 23 - Detecting presence of memory DIMMs
  • 25 - Configuring memory
  • 28 - Testing memory
  • 34 - Loading recovery capsule
  • E4 - Entered DXE phase
  • 12 - Starting Application processor initialization
  • 13 - SMM initialization
  • 50 - Enumerating PCI busses
  • 51 - Allocating resourced to PCI bus
  • 92 - Detecting the presence of the keyboard
  • 90 - Resetting keyboard
  • 94 - Clearing keyboard input buffer
  • 95 - Keyboard Self Test
  • EB - Calling Video BIOS
  • 58 - Resetting USB bus
  • 5A - Resetting PATA/SATA bus and all devices
  • 92 - Detecting the presence of the keyboard
  • 90 - Resetting keyboard
  • 94 - Clearing keyboard input buffer
  • 5A - Resetting PATA/SATA bus and all devices
  • 28 - Testing memory
  • 90 - Resetting keyboard
  • 94 - Clearing keyboard input buffer
  • E7 - Waiting for user input
  • 01 - INT 19
  • 00 - Ready to boot
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