Test

Beep

POST Routine Description

Point

Code

 

 

 

 

4Eh

 

Display BIOS copyright notice

 

 

 

4Fh

 

Initialize MultiBoot

 

 

 

50h

 

Display processor type and speed

 

 

 

52h

 

Test keyboard

 

 

 

54h

 

Set key click if enabled

 

 

 

55h

 

Enable USB devices

 

 

 

58h

2-2-3-1

Test for unexpected interrupts

 

 

 

59h

 

Initialize POST display service

 

 

 

5Ah

 

Display prompt “Press F2 to enter SETUP”

 

 

 

5Bh

 

Disable processor cache

 

 

 

5Ch

 

Test RAM between 512 and 640 kb

 

 

 

60h

 

Test extended memory

 

 

 

62h

 

Test extended memory address lines

 

 

 

64h

 

Jump to UserPatch 1

 

 

 

66h

 

Configure advanced cache registers

 

 

 

67h

 

Initialize multiprocessor APIC

 

 

 

68h

 

Enable external and processor caches

 

 

 

69h

 

Setup System Management Mode (SMM) area

 

 

 

6Ah

 

Display external L2 cache size

 

 

 

6Bh

 

Load custom defaults (optional)

 

 

 

6Ch

 

Display shadow-area message

 

 

 

6Eh

 

Display possible high address for UMB recovery

 

 

 

70h

 

Display error messages

 

 

 

72h

 

Check for configuration errors

 

 

 

76h

 

Check for keyboard errors

 

 

 

7Ch

 

Set up hardware interrupt vectors

 

 

 

7Dh

 

Initialize intelligent system monitoring

 

 

 

7Eh

 

Initialize coprocessor if present

 

 

 

80h

 

Disable onboard SuperI/O ports and IRQs

 

 

 

81h

 

Late POST device initialization

 

 

 

82h

 

Detect and install external RS232 ports

 

 

 

83h

 

Configure non-MCD IDE controllers

 

 

 

*If the BIOS detects error 2C or 2E, it displays an additional word-bitmap (xxxx) indicating the address line or bits that failed. For example, “2C 0002” means address line 1 (bit one set) has failed. “2E 1020” means data bits 12 and 5 (bits 12 and 5 set) have failed in the lower 16 bits.

90Gateway 7450R Server System Manual