Appendix B: BIOS POST Codes

 

 

POST Code

Description

5Ch

Test RAM between 512 and 640 kB

60h

Test extended memory

62h

Test extended memory address lines

64h

Jump to UserPatch1

66h

Configure advanced cache registers

67h

Initialize Multi Processor APIC

68h

Enable external and CPU caches

69h

Setup System Management Mode (SMM) area

6Ah

Display external L2 cache size

6Bh

Load custom defaults (optional)

6Ch

Display shadow-area message

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 (optional)

7Eh

Initialize coprocessor if present

80h

Disable onboard Super I/O ports and IRQs (optional)

81h

Late POST device initialization

82h

Detect and install external RS232 ports

83h

Configure non-MCD IDE controllers

84h

Detect and install external parallel ports

85h

Initialize PC-compatible PnP ISA devices

86h

Re-initialize onboard I/O ports.

87h

Configure Motherboard Configurable Devices

 

(optional)

88h

Initialize BIOS Data Area

89h

Enable Non-Maskable Interrupts (NMIs)

8Ah

Initialize Extended BIOS Data Area

8Bh

Test and initialize PS/2 mouse

8Ch

Initialize floppy controller

8Fh

Determine number of ATA drives (optional)

90h

Initialize hard-disk controllers

91h

Initialize local-bus hard-disk controllers

92h

Jump to UserPatch2

93h

Build MPTABLE for multi-processor boards

95h

Install CD ROM for boot

96h

Clear huge ES segment register

97h

Fix up Multi Processor table

98h

1-2 Search for option ROMs and shadow if successful. One

 

long, two short beeps on checksum failure

B-3

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SUPER MICRO Computer C2SBE, C2SBA+II user manual Post Code Description