| 02 |
Verify real
mode |
| 12 |
Restore processor
control word during warm boot (only occurs on warm boot) |
| 24 |
Set ES segment
register to 4GB |
| 04 |
Get processor
type |
| 06 |
Initialize
system hardware |
| 18 |
8254 timer
initialization |
| 08 |
Initialize
PCIset registers with initial POST values |
| C4 |
Initialize
system flags in CMOS |
| 11 |
Load alternate
registers with initial POST values |
| 0E |
Initialize
I/O |
| 0C |
Initialize
caches to initial POST values |
| 16 |
BIOS ROM
checksum |
| 17 |
Turn off
cache |
| 28 |
Autosize
DRAM |
| 2A |
Clear 512KB
base RAM |
| 2C |
RAM failure
on address line xxxx |
| 2E |
RAM failure
on data bits xxxx of low byte of memory bus (first 4 meg) |
| 2F |
Initialize
L2 cache if enabled in CMOS |
| 38 |
Shadow system
BIOS ROM |
| 20 |
Test DRAM
refresh |
| 29 |
Post Memory
Manager initialization (PMM) |
| 33 |
Post Dispatch
Manager initialization |
| 34 |
Test CMOS |
| C1 |
Post error
manager initialization |
| 09 |
Set IN POST
flag |
| 0A |
Initialize
processor registers and CPU microcode |
| 3A |
Autosize
cache |
| 0B |
Enable processor
cache |
| 0F |
Initialize
the local bus IDE |
| 10 |
Initialize
Power Management (APM not used in Nightshade) |
| 14 |
Initialize
keyboard controller |
| 1A |
8237 DMA
controller initialization |
| 1C |
Reset Programmable
Interrupt Controller |
| 22 |
Test 8742
Keyboard Controller |
| 32 |
Read processor
bus-clock frequency and compute boot processor speed |
| 67 |
Initialize
and register other CPU via SMM through APIC bus |
| 69 |
Initialize
SMI handler for all processors |
| 00 |
Wait for
secondary processor to execute init SMI handler |
| F4 |
Exit SMI
handler (secondary processor executed halt in SMI) |
| 3C |
Configure
advanced PCIset registers and reset coprocessor |
| 3D |
Load alternate
registers with CMOS values |
| 42 |
Initialize
interrupt vectors |
| 46 |
Check ROM
copyright notice |
| 45 |
Initialize
all pre-PnP devices |
| 49 |
Initialize
PnP bus and devices (also read ESCD and allocate resources) |
| 48 |
Check video
configuration against CMOS (VGA or MDA) |
| 4A |
Initialize
all video adapters in system |
| 4C |
Shadow video
BIOS ROM |
| 24 |
Put CPU in
big real mode (flat mode memory addressing - up to 4GB) |
| 59 |
Post display
manager initialization (video screen error codes now visible) |
| 22 |
Reset and
test keyboard first try (only warm reset) |
| 52 |
Reset and
test keyboard controller (both warm and cold reset) |
| 54 |
Set key click
if enabled |
| 76 |
Enable keyboard |
| 58 |
Test for
unexpected interrupts |
| 4B |
QuietBoot
start (not used in N440BX) |
| 4E |
Display copyright
notice |
| 50 |
Display CPU(s)
type and speed |
| 51 |
EISA initialized
(not used in N440BX) |
| 5A |
Display prompt
"Press F2 to enter SETUP" |
| 5B |
Disable CPU
L1 cache for memory test |
| 5C |
Test RAM
between 512KB and 640KB |
| 60 |
Test extended
memory (4MB to top of memory) |
| 62 |
Test extended
memory address lines |
| 64 |
Jump to UserPatch1 |
| 66 |
Configure
advanced cache registers |
| 68 |
Enable external
and processor caches |
| 6A |
Display external
cache size |
| 6C |
Display shadow
message |
| 6E |
Display non-disposable
segments |
| 70 |
Display error
messages to video |
| 72 |
Check for
configuration errors |
| 74 |
Test real
time clock |
| 7C |
Setup hardware
interrupt vectors |
| 7E |
Test coprocessor
if present |
| 80 |
Not used |
| 88 |
Initialize
BIOS Data Area, time-outs for detecting parallel, serial and HDD
controller. Clear CMOS shutdown flag |
| 8A |
Initialize
Extended BIOS Data Area |
| 81 |
Late POST
core initialization |
| 87 |
Configure
MCD devices |
| 85 |
Initialize
and detect PC compatible PnP ISA devices (serial, parallel, etc.) |
| 82 |
Not used |
| 84 |
Clear interrupts
from COM port detection |
| 86 |
Console redirection
initialized |
| 83 |
Configure
onboard hard disk controller |
| 89 |
Enable NMI |
| 8C |
Initialize
floppy controller |
| 90 |
Initialize
and detect hard disks |
| 8B |
Detect and
test for Mouse or Auxiliary device on keyboard controller |
| 95 |
Install CD-ROM
for boot |
| 92 |
Jump to UserPatch2 |
| C5 |
Initialize
GPNV areas of DMI |
| 98 |
Search for
option ROMs. One long, two short beeps for checksum failure of an
option ROM |
| 93 |
Scan for
User flash ROMs. MP Table initialization (wake up secondary processor
and halt it) |
| 9C |
Setup Power
Management (not used) |
| 9D |
Enable security |
| 9E |
Enable hardware
interrupts |
| A0 |
Set time
of day |
| A2 |
Check key
lock |
| A4 |
Initialize
typematic rate |
| C2 |
Initialize
DMI tables |
| C3 |
Log POST
errors with POST Error Manager and to SEL in BMC. Update VID bits
and memory presence to BMC. Display any FRB errors (watchdog time-outs,
bist or CPU failures) |
| A8 |
Erase F2
prompt |
| AA |
Scan for
F2 keystroke |
| AC |
Initialize
EMP port if selected. Remove COM2 from BDA of EMP is enabled. Enter
SETUP |
| AE |
Clear IN
POST flag |
| B0 |
Turn on secure
boot if enabled (secure front panel, blank video, floppy write protect).
Check for errors |
| B2 |
POST done
- prepare to boot Operating System |
| B4 |
One short
beep before boot |
| B5 |
Display QuietBoot
(not used) |
| BE |
Clear screen |
| B6 |
Check password
(optional) |
| BC |
Clear parity
checkers |
| BA |
Not used |
| B7 |
ACPI configuration
(table configuration in memory and BDA) |
| BD |
Display MultiBoot
menu if ESC is hit |
| BF |
Display system
configuration summary (if enabled in CMOS) |
| 8F |
Get total
# of hard drives and put in BDA |
| 91 |
Program IDE
hard drives (timing, PIO modes, etc.) |
| 9F |
Save total
# of hard drives (SCSI and ATA) in BDA |
| 97 |
Fixup MP
Table (checksum) |
| 99 |
Check SMART
harddrive |
| C7 |
Prepare to
boot OS, clean up graphics and PMM areas |
| C0 |
Try to boot
Int19h. Return to video mode 3, disable PMM, return to real mode,
disable gate A20, clear system memory, reset stack, invoke Int19h |
