AIMB-240 Series
90 AIMB-240 Series User’s Manual
40. POST Codes
Please take reference to Phoenix-Award website for the latest post codes.
http://www.phoenix.com/en/Customer+Services/BIOS/AwardBIOS/Award+Error+Codes.ht
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40.1 Normal POST Code
Note: EISA POST codes are typically output to port address 300h. ISA POST codes are output to
port address 80h.
Code (hex) Name Description
C0 Turn Off Chipset and
CPU test
OEM Specific-Cache control cache
Processor Status (1FLAGS) Verification. Tests the following
processor status flags: Carry, zero, sign, overflow, the BIOS sets
each flag, verifies They are set, then turns each flag off and
verifies it is off.
Read/Write/Verify all CPU registers except SS, SP, and BP with
data pattern FF and 00. RAM must be periodically refreshed to
keep the memory from decaying. This function ensures that the
memory refresh function is working properly.
C1 Memory Presence First block memory detect OEM Specific-Test to size on-board
memory. Early chip set initialization Memory presence test OEM
chip set routines clear low 64K of memory Test first 64K memory.
C2 Early Memory
Initialization
OEM Specific- Board Initialization
C3 Extend Memory DRAM
select
OEM Specific- Turn on extended memory Initialization
Cyrix CPU initialization, Cache initialization
C4 Special Display
Handling
OEM Specific- Display/Video Switch handling so that switch
handling display switch errors never occurs
C5 Early Shadow OEM specific- Early shadow enable for fast boot
C6 Cache presence test External cache size detection
CF CMOS Check CMOS checkup
B0 Spurious If interrupt occurs in protected mode.
B1 Unclaimed NMI If unmasked NMI occurs, display Press F1 to disable NMI, F2
reboot.
BF Program Chip Set To program chipset from defaults values
E1-EF Setup Pages E1- Page 1, E2 - Page 2, etc.
1 Force load Default to
chipset
Chipset defaults program
2 Reserved
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