Table 13. Witness BIOS POST codes (continued)
Phase POST codes DESCRIPTION
PEI 0x4F DXE IPL is started
PEI 0x60 DXE Core is started
DXE 0x61 NVRAM initialization
DXE 0x62 Installation of the South Bridge Runtime
Services
DXE 0x68 PCI host bridge initialization
DXE 0x69 North Bridge DXE initialization is started
DXE 0x6A North Bridge DXE SMM initialization is
started
DXE 0x70 South Bridge DXE initialization is started
DXE 0x71 South Bridge DXE SMM initialization is
started
DXE 0x78 ACPI module initialization
DXE 0x79 CSM initialization
DXE 0x90 Boot Device Selection (BDS) phase is
started
DXE 0x91 Driver connecting is started
DXE 0x92 PCI Bus initialization is started
DXE 0x94 PCI Bus Enumeration
DXE 0x95 PCI Bus Request Resources
DXE 0x96 PCI Bus Assign Resources
DXE 0x97 Console Output devices connect
DXE 0x9A USB initialization is started
DXE 0x9C USB Detect
DXE 0x9D USB Enable
DXE 0XA0 IDE initialization is started
DXE 0xA2 IDE Detect
DXE 0XAD Ready to Boot event
DXE 0xB4 USB hot plug
DXE 0xC0 No NVMe (M.2) bootable device
DXE 0xD9 Error loading Boot Option (Boot Image
failure)
Using the system
Witness serial communication
About this task
The Witness server utilizes a USB to UART method of serial communication accessible via a micro-USB form-factor port located
on the front panel.
16
Initial system setup and configuration
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