Appendix B BIOS POST Codes B-9
AC Indicates chipset-specific (NB/SB) programming needed during end POST, just before
giving control to runtime code booting to the OS. Programs the system BIOS (0F0000h
shadow RAM) cacheability. Ports to handle any OEM-specific programming needed
during end POST. Copies OEM-specific data from POST_DSEG to RUN_CSEG.
B1 Saves system context for the ACPI.
00 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 CLIHLT state.
61-70 Indicates OEM POST Error. This range is reserved for chipset vendors and system
manufacturers. The error associated with this value may differ among platforms
TABLE B-2 POST Code Checkpoints (Continued)
Post Code Description
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