Teknor Industrial Computers VIPer 821, Technical Reference Manual

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BIOS Setup Error Codes
E-5
E.4 POST CODES
NOTE
EISA POST codes are typically output to port address 300h. ISA
POST codes are output to port address 80h.
POST Codes
POST
(hex)
Name Description
C0 Turn Off Chipset Cache OEM Specific-Cache control
01 Processor Test 1 Processor Status (1FLAGS) Verification.
Tests the following processor status flags: Carry, zero, sign, overflow.
The BIOS will set each of these flags, verify they are set, then turn each
flag off and verify it is off.
02 Processor Test 2 Read/Write/Verify all CPU registers except SS, SP, and BP with data
pattern FF and 00.
03 Initialize Chips Disable NMI, PIE, AIE, UEI, SQWV.
Disable video, parity checking, DMA.
Reset math coprocessor.
Clear all page registers, CMOS shutdown byte.
Initialize timer 0, 1, and 2, including set EISA timer to a known state.
Initialize DMA controllers 0 and 1.
Initialize interrupt controllers 0 and 1.
Initialize EISA extended registers.
04 Test Memory Refresh Toggle RAM must be periodically refreshed in order to keep the memory from
decaying. This function assures that the memory refresh function is
working properly.
05 Blank video,
Initialize keyboard Keyboard controller initialization.
06 Reserved
07 Test CMOS Interface and
Battery Status Verifies CMOS is working correctly, detects bad battery.
BE Chipset Default Initialization Program chipset registers with power on BIOS defaults.
C1 Memory presence test OEM Specific-Test to size on-board memory.
C5 Early Shadow OEM Specific-Early Shadow enable for fast boot.
C6 Cache presence test External cache size detection.
08 Setup low memory Early chip set initialization.
Memory presence test.
OEM chip set routines.
Clear low 64K of memory.
Test first 64K memory.
09 Early Cache Initialization Cyrix CPU initialization.
Cache initialization.
0A Setup Interrupt
Vector Table Initialize first 120 interrupt vectors with SPURIOUS_INT_HDLR and
initialize INT 00h-1Fh according to INT_TBL.
0B Test CMOS RAM Checksum Test CMOS RAM Checksum, if bad, or insert key pressed, load
defaults.
0C Initialize keyboard Detect type of keyboard controller (optional).
Set NUM LOCK status.