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Chapter 4 163
Post Codes
These tables describe the POST codes and descriptions during the POST.
Post Code Range
SEC Phase POST Code Table
PEI Phase POST Code Table:
Phase POST Code Range
SEC 0x01 - 0x0F
PEI 0x70 - 0x9F
DXE 0x40 - 0x6F
BDS 0x10 - 0x3F
SMM 0xA0 - 0xBF
S3 0xC0 - 0xCF
ASL 0x51 – 0x55
0xE1 – 0xE4
PostBDS 0xF9 – 0xFE
Reserved 0xD8 – 0xE0
0xE5 – 0xF8
Functionality Name (Include\
PostCode.h)
Phase
Post
Code
Description
SEC_SYSTEM_POWER_ON SEC 1 CPU power on and switch to
Protected mode
SEC_BEFORE_MICROCODE_PATCH SEC 2 Patching CPU microcode
SEC_AFTER_MICROCODE_PATCH SEC 3 Setup Cache as RAM
SEC_SETUP_CAR_OK SEC 7 Cache as RAM test
SEC_GO_TO_SECSTARTUP SEC 9 Setup BIOS ROM cache
SEC_GO_TO_PEICORE SEC 0A Enter Boot Firmware Volume
Functionality Name (Include\
PostCode.h)
Phase
Post
Code
Description
PEI_SIO_INIT PEI 70 Super I/O Initialization
PEI_CPU_REG_INIT PEI 71 CPU Early Initialization
PEI_CPU_AP_INIT PEI 72 Multi-processor Early Initial
PEI_CPU_HT_RESET PEI 73 HyperTransport Initialization
PEI_PCIE_MMIO_INIT PEI 74 PCIE MMIO BAR Initialization
PEI_NB_REG_INIT PEI 75 North Bridge Early Initialization
PEI_SB_REG_INIT PEI 76 South Bridge Early Initialization
PEI_PCIE_TRAINING PEI 77 PCIE Training
PEI_TPM_INIT PEI 78 TPM Initialization
PEI_SMBUS_INIT PEI 79 SMBUS Early Initialization
PEI_PROGRAM_CLOCK_GEN PEI 7A Clock Generator Initialization
PEI_MEMORY_INIT PEI 7E Memory Initial for Normal boot.
PEI_MEMORY_INIT_FOR_CRISIS PEI 7F Memory Initial for Crisis Recovery
PEI_MEMORY_INSTALL PEI 80 Simple Memory test
PEI_SWITCH_STACK PEI 82 Start to use Memory