Appendix B BIOS POST Codes B-5
00c6 Re-enables cache for boot strap processor, and applies workarounds in the BSP for errata
#106, #107, #69, and #63 if appropriate.
00c7 The HT sets link frequencies and widths to their final values.
000a Initializes the 8042-compatible keyboard controller.
000c Detects the presence of a keyboard in the KBC port.
000e Tests and initializes different input devices. Traps the INT09h vector so that the POST
INT09h handler gets control for IRQ1.
8600 Prepares the CPU for booting to the OS by copying all of the context of the BSP to all
application processors present. APs are left in the CLI HLT state.
de00 Prepares the CPU for booting to the OS by copying all of the context of the BSP to all
application processors present. APs are left in the CLI HLT state.
8613 Initializes PM regs and PM PCI regs at early POST. Initializes the multihost bridge, if the
system supports it. Sets up ECC options before memory clearing. Enables PCI-X clock
lines in the 8131.
0024 Decompresses and initializes any platform-specific BIOS modules.
862a Inititalizes BBS ROM.
002a Generic Device Initialization Manager (DIM) – Disables all devices.
042a ISA PnP devices – Disables all devices.
052a PCI devices – Disables all devices.
122a ISA devices – Static device initialization.
152a PCI devices – Static device initialization.
252a PCI devices – Output device initialization.
202c Initializes different devices. Detects and initializes the video adapter installed in systems
that have optional ROMs.
002e Initializes all the output devices.
0033 Initializes the silent boot module. Sets the window for displaying text information.
0037 Displays sign-on message, CPU information, setup key message, and any OEM-specific
information.
4538 PCI devices – IPL device initialization.
5538 PCI devices – General device initialization.
8600 Prepares the CPU for booting to the OS by copying all of the context of the BSP to all
application processors present. APs are left in the CLI HLT state.
TABLE B-1 POST Codes (Continued)
Post Code Description
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