| 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 OEM Specific-Cache control
Cache
1 Processor Test 1 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.
2 Processor Test 2 Read/Write/Verify all CPU registers
except SS, SP, and BP with data
pattern FF and 00.
3 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.
4 Test Memory RAM must be periodically refreshed to
Refresh Toggle keep the memory from decaying. This
function ensures that the memory
refresh function is working properly.
5 Blank video, Keyboard controller initialization.
Initialize
keyboard
6 Reserved
7 Test CMOS Verifies CMOS is working correctly,
Interface and detects bad battery.
Battery Status
BE Chipset Default Program chipset registers with power
Initialization on BIOS defaults.
C1 Memory presence OEM Specific-Test to size on-board
test memory
C5 Early Shadow OEM Specific-Early Shadow enable for
fast boot.
C6 Cache presence External cache size detection
test
8 Setup low memory Early chip set initialization
Memory presence test
OEM chip set routines
Clear low 64K of memory
Test first 64K memory.
9 Early Cache Cyrix CPU initialization
Initialization Cache initialization
A Setup Interrupt Initialize first 120 interrupt
Vector Table vectors with SPURIOUS_INT_HDLR and
initialize
INT 00h-1Fh according to INT_TBL
B Test CMOS RAM Test CMOS RAM Checksum, if bad, or
Checksum insert key pressed, load defaults.
C Initialize Detect type of keyboard controller
keyboard (optional)
Set NUM_LOCK status.
D Initialize Video Detect CPU clock.
Interface Read CMOS location 14h to find out
type of video in use.
Detect and Initialize Video Adapter.
E Test Video Test video memory, write sign-on
Memory message to screen.
Setup shadow RAM - Enable shadow
according to Setup.
F Test DMA BIOS checksum test.
Controller 0 Keyboard detect and initialization
10 Test DMA
Controller 1
11 Test DMA Page Test DMA Page Registers.
Registers
12-13 Reserved
14 Test Timer Test 8254 Timer 0 Counter 2.
Counter 2
15 Test 8259-1 Mask Verify 8259 Channel 1 masked
Bits interrupts by alternately turning off
and on the interrupt lines.
16 Test 8259-2 Mask Verify 8259 Channel 2 masked
Bits interrupts by alternately turning off
and on the interrupt lines.
17 Test Stuck Turn off interrupts then verify no
8259's Interrupt interrupt mask register is on.
Bits
18 Test 8259 Force an interrupt and verify the
Interrupt interrupt occurred.
Functionality
19 Test Stuck NMI Verify NMI can be cleared.
Bits (Parity/IO
Check)
1A Display CPU clock
1B-1E Reserved
1F Set EISA Mode If EISA non-volatile memory checksum
is good, execute EISA initialization.
If not, execute ISA tests an clear
EISA mode flag.
Test EISA Configuration Memory
Integrity (checksum & communication
interface).
20 Enable Slot 0 Initialize slot 0 (System Board).
21-2F Enable Slots Initialize slots 1 through 15.
1-15
30 Size Base and Size base memory from 256K to 640K
Extended Memory and extended memory above 1MB.
31 Test Base and Test base memory from 256K to 640K
Extended Memory and extended memory above 1MB using
various patterns.
NOTE: This test is skipped in EISA
mode and can be skipped with ESC key
in ISA mode.
32 Test EISA If EISA Mode flag is set then test
Extended Memory EISA memory found in slots
initialization.
NOTE: This test is skipped in ISA
mode and can be skipped with ESC key
in EISA mode.
33-3B Reserved
3C Setup Enabled
3D Initialize & Detect if mouse is present,
Install Mouse initialize mouse, install interrupt
vectors.
3E Setup Cache Initialize cache controller.
Controller
3F Reserved
BF Chipset Program chipset registers with Setup
Initialization values
40 Display virus protect disable or
enable
41 Initialize Initialize floppy disk drive
Floppy Drive & controller and any drives.
Controller
42 Initialize Hard initialize hard drive controller and
Drive & any drives.
Controller
43 Detect & Initialize any serial and parallel
Initialize ports (also game port).
Serial/Parallel
Ports
44 Reserved
45 Detect & Initialize math coprocessor.
Initialize Math
Coprocessor
46 Reserved
47 Reserved
48-4D Reserved
4E Manufacturing Reboot if Manufacturing POST Loop pin
POST Loop or is set. Otherwise display any
Display Messages messages (i.e., any non-fatal errors
that were detected during POST) and
enter Setup.
4F Security Check Ask password security (optional).
50 Write CMOS Write all CMOS values back to RAM and
clear screen.
51 Pre-boot Enable Enable parity checker
Enable NMI, Enable cache before boot.
52 Initialize Initialize any option ROMs present
Option ROMs from C8000h to EFFFFh.
NOTE: When FSCAN option is enabled,
ROMs initialize from C8000h to
F7FFFh.
53 Initialize Time Initialize time value in 40h: BIOS
Value area.
60 Setup Virus Setup virus protect according to
Protect Setup
61 Set Boot Speed Set system speed for boot
62 Setup NumLock Setup NumLock status according to
Setup
63 Boot Attempt Set low stack
Boot via INT 19h.
B0 Spurious If interrupt occurs in protected
mode.
B1 Unclaimed NMI If unmasked NMI occurs, display
Press F1 to disable NMI, F2 reboot.
E1-EF Setup Pages E1- Page 1, E2 - Page 2, etc.
FF Boot
Unless otherwise noted, this document and the information herein disclosed are proprietary to AWARD Software International, Inc. (Award). Any person or entity to whom this document is furnished or who otherwise has possession thereof, by acceptance agrees that it will not be copied or reproduced in whole or in part, nor used in any manner except to meet the purposes for which it was delivered.
The information in this document is subject to change without notice, and should not be considered as a commitment by Award. Although Award will make every effort to inform users of substantive errors, Award disclaims all liability for any loss or damage resulting from the use of this document or any hardware or software described herein, including without limitation contingent, special, or incidental liability.
EliteBIOS is a trademark of Award Software International Inc.
Award Software International and the Award logo are registered trademarks
of Award Software International Inc.
All other products and brand names are trademarks and registered trademarks
of their respective companies.
Copyright © 1996, Award Software International Inc. All rights reserved.
Document Revision 1.3; August 1996. Last updated 11 September 96.