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66 Chapter 4
4Ch Reserved
4Dh Reserved
4Eh 1. Program MTRR of M1 CPU
2. Initialize L2 cache for P6 class CPU & program CPU
with proper cacheable range.
3. Initialize the APIC for P6 class CPU.
4. On MP platform, adjust the cacheable range to smaller
one in case the cacheable ranges between each CPU
are not identical.
4Fh Reserved
50h Initialize USB Keyboard & Mouse
51h Reserved
52h Test all memory (clear all extended memory to 0)
53h Clear password according to H/W jumper (Optional)
54h Reserved
55h Display number of processors (multi-processor platform)
56h Reserved
57h 1. Display PnP logo
2. Early ISA PnP initialization - Assign CSN to every ISA
PnP device
58h Reserved
59h Initialize the combined Trend Anti-Virus code
5Ah Reserved
5Bh (Optional Feature)
Show message for entering AWDFLASH.EXE from FDD
(optional)
5Ch Reserved
5Dh 1. Initialize Init_Onboard_Super_IO
2. Initialize Init_Onboard_AUDIO
5Eh Reserved
5Fh Reserved
60h Okay to enter Setup utility; i.e. not until this POST stage
can users enter the CMOS setup utility.
61h Reserved
62h Reserved
63h Reset keyboard if Early_Reset_KB is not defined.
64h Reserved
65h Initialize PS/2 Mouse
66h Reserved
67h Prepare memory size information for function call:
INT 15h ax=E820h
68h Reserved
69h Turn on L2 cache
6Ah Reserved
Checkpoint Description