Checkpoint Description
A2 Takes care of runtime image preparation for different 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
A4 Initialize runtime language module. Display boot option popup menu.
A7 Displays the system configuration screen if enabled. Initialize the CPU’s
before boot, which includes the programming of the MTRR’s.
A9 Wait for user input at config display if needed.
AA Uninstall POST INT1Ch vector and INT09h vector.
AB Prepare BBS for Int 19 boot. Init MP tables.
AC End of POST initialization of chipset registers. De-initializes the ADM
module.
B1 Save system context for ACPI. Prepare CPU for OS boot including final
MTRR values.
00 Passes control to OS Loader (typically INT19h).
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