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6. Appendix
Table 6.3.
POST Codes < 3 / 5 >
POST
(hex)
3Fh
Reserved
40h
Test 8259 interrupt mask bits for channel 2.
41h
Reserved
42h
Reserved
43h
Test 8259 functionality.
44h
Reserved
45h
Reserved
46h
Reserved
47h
Initialize EISA slot
48h
Reserved
Calculate total memory by testing the last double word of each 64K page.
49h
Program writes allocation for AMD K5 CPU.
4Ah
Reserved
4Bh
Reserved
4Ch
Reserved
4Dh
Reserved
Program MTRR of M1 CPU
Initialize L2 cache for P6 class CPU & program CPU with proper cacheable range.
4Eh
Initialize the APIC for P6 class CPU.
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
51h
Reserved
52h
Test all memory (clear all extended memory to 0)
53h
Reserved
54h
Reserved
55h
Display number of processors (multi-processor platform)
56h
Reserved
Display PnP logo
57h
Early ISA PnP initialization
-Assign CSN to every ISA PnP device.
58h
Reserved
59h
Initialize the combined Trend Anti-Virus code.
5Ah
Reserved
(Optional Feature)
5Bh
Show message for entering AWDFLASH.EXE from FDD (optional)
5Ch
Reserved
Initialize Init_Onboard_Super_IO switch.
5Dh
Initialize Init_Onbaord_AUDIO switch.
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
Reserved
64h
Reserved
65h
Initialize PS/2 Mouse
90
Description
IPC-BX955 User's manual
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