- the site for BIOS, POST & BEEP code information

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