Table 13. Post Codes (continued)
Diagnostic LED Decoder
Post | G=Green, R=Red, A=Amber | |||
Code | MSB |
|
| LSB |
|
|
| ||
0Fh | G | G | G | G |
|
|
|
|
|
Description
Write Command Byte 8042: The initialization after the keyboard controller BAT command test is done. The keyboard command byte will be written next.
10h
Off
Off Off R
Keyboard Init: The keyboard controller command byte is written. Next, issuing the pin 23 and 24 blocking and unblocking commands.
10h
11h
13h
19h
Off
Off
Off
G
Off Off R Off Off A
Off G A Off Off A
Disable and initialize 8259.
Detect Configuration Mode, such as CMOS clear.
Chipset Initialization before CMOS initialization.
Init System Timer: The 8254 timer test is over. Starting the memory refresh test next.
1Ah
23h
24h
25h
F2h
F5h
12h
12h
12h
27h
F4h
F6h
15h
15h
15h
26h
28h
29h
2Ah
G
Off
Off
Off
R
R
Off
Off
Off
Off
R
R
Off
Off
Off
Off
G
G
G
Off | G | R |
|
|
|
Off | A | G |
|
|
|
G | R | Off |
|
|
|
G | R | G |
|
|
|
R | A | R |
|
|
|
A | R | A |
|
|
|
Off | G | R |
|
|
|
Off | G | R |
|
|
|
Off | G | R |
|
|
|
G | A | G |
|
|
|
A | R | R |
|
|
|
A | A | R |
|
|
|
G | Off | A |
|
|
|
G | Off | A |
|
|
|
G | Off | A |
|
|
|
G | A | Off |
Off | R | Off |
|
|
|
Off | R | G |
|
|
|
Off | A | Off |
|
|
|
Check Refresh Toggle: The memory refresh line is toggling. Checking the 15 second on/off time next.
Setup Interrupt Vectors: Reading the 8042 input port and disabling the MEGAKEY Green PC feature next. Making the BIOS code segment writable and performing any necessary configuration before initializing the interrupt vectors.
Before Vector: Configuration is required before interrupt vector initialization has completed. Interrupt vector initialization is about to begin.
Init interrupt Vectors: Interrupt vector initialization is done.
Initialize SMM handler. Initialize USB emulation.
Validate NVRAM areas. Restore from backup if corrupted.
Load defaults in CMOS RAM if bad checksum or CMOS clear jumper is detected.
Initializing APP CMOS RAM for appliance servers only.
Check point After CMOS Initialized.
Validate date and time in RTC.
Load Micro Code To All CPUs.
Scan SMBIOS GPNV areas.
8254 Timer Test on Channel 2.
Enable 8042.
Keyboard Reset.
Initialize LCD, if supported.
Set Video Mode: Initialization before setting the video mode is complete. Configuring the monochrome mode and color mode settings next.
Debugger Hook.
Init PCI devices and motherboard devices. Pass control to video BIOS. Start serial console redirection.
continued
Technical Reference | 71 |