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3 Getting Started
32
8D Build ACPI tables (if ACPI is supported).
8E Program the peripheral parameters. Enable/Disable
NMI as selected.
90 Late POST initialization of system management inter-
rupt.
A0 Check boot password if installed.
A1 Clean-up work needed before booting to OS.
A2 Takes care of runtime image preparation for differ-
ent BIOS modules. Fill the free area in F000h segment
with 0FFh. Initializes the Microsoft IRQ Routing Table.
Prepares the runtime language module. Disables the
system configuration display if needed.
A4 Initialize runtime language module.
A7 Displays the system configuration screen if enabled.
Initialize the CPU before boot, which includes the
programming of MTRR.
A8 Prepare CPU for OS boot including final MTRR values.
A9 Wait for user input at configure display if needed.
AA Uninstall POST INT1Ch vector and INT09h vector.
Reinitializes the ADM module.
AB Prepare BBS for Int 19 boot.
AC End of POST initialization of chipset registers.
B1 Save system context for ACPI.
00 Passes control to OS Loader (typically INT19h).
Checkpoint Code Description
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