APPENDIX
62
IB730 User’s Manual
POST (hex)
Description
47h
Initialize EISA slot
49h
1. Calculate total memory by testing the last double word of
each 64K page.
2. Program writes allocation for AMD K5 CPU.
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.
50h
Initialize USB
52h
Test all memory (clear all extended memory to 0)
55h
Display number of processors (multi-processor platform)
57h
1. Display PnP logo
2. Early ISA PnP initialization
-Assign CSN to every ISA PnP device.
59h
Initialize the combined Trend Anti-Virus code.
5Bh
(Optional Feature)
Show message for entering AWDFLASH.EXE from FDD
(optional)
5Dh
1. Initialize Init_Onboard_Super_IO switch.
2. Initialize Init_Onbaord_AUDIO switch.
60h
Okay to enter Setup utility; i.e. not until this POST stage can users
enter the CMOS setup utility.
65h
Initialize PS/2 Mouse
67h
Prepare memory size information for function call:
INT 15h ax=E820h
69h
Turn on L2 cache
6Bh
Program chipset registers according to items described in Setup &
Auto-configuration table.
6Dh
1. Assign resources to all ISA PnP devices.
2. Auto assign ports to onboard COM ports if the
corresponding item in Setup is set to “AUTO”.
6Fh
1. Initialize floppy controller
2. Set up floppy related fields in 40:hardware.
73h
(Optional Feature)
Enter AWDFLASH.EXE if :
-AWDFLASH is found in floppy drive.
-ALT+F2 is pressed
75h
Detect & install all IDE devices: HDD, LS120, ZIP, CDROM… ..
77h
Detect serial ports & parallel ports.
7Ah
Detect & install co-processor