| 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 |
