Post Code Checkpoints - Acer Altos G520 Service Manual

POST Code Checkpoints

Diagnostic LED Decoder
Checkpoint G=Green, R=Red, A=Amber
MSB
03 OFF
04 OFF
05 OFF
06 OFF
08 G
C0 R
C1 R
C2 R
C5 R
C6 R
C7 R
0A G
0B G
0C G
0E G
13 OFF
24 OFF
30 OFF
2A G
2C G
2E G
31 OFF
73
LSB
Disable NMI, parity, video for EGA, and DMA controllers. Initialize
BIOS, POST, Run-time data area. Initialize BIOS modules on POST
OFF G G
entry and GPNV area. Initialized CMOS as mentioned in the Kernel
Variable "wCMOSFlags."
Check CMOS diagnostic byte to determine if battery power is OK and
CMOS checksum is OK. Verify CMOS checksum manually by reading
storage area. If the CMOS checksum is bad, update CMOS with
power-on default values and clear passwords. Initialize status register
G OFF OFF
A.
Initializes data variables that are based on CMOS setup questions.
Initializes both the 8259 compatible PICs in the system
Initializes the interrupt controlling hardware (generally PIC) and
G OFF G
interrupt vector table.
Do R/W test to CH-2 count reg. Initialize CH-0 as system timer. Install
the POSTINT1Ch handler. Enable IRQ-0 in PIC for system timer
G G OFF
interrupt.
Traps INT1Ch vector to "POSTINT1ChHandlerBlock."
Initializes the CPU. The BAT test is being done on KBC. Program the
OFF OFF OFF
keyboard controller command byte is being done after Auto detection
of KB/MS using AMI KB-5.
R OFF OFF Early CPU Init Start -- Disable Cache - Init Local APIC
R OFF G Set up boot strap processor Information
R G OFF Set up boot strap processor for POST
A OFF G Enumerate and set up application processors
A G OFF Re-enable cache for boot strap processor
A G G Early CPU Init Exit
OFF G OFF Initializes the 8042 compatible Key Board Controller.
OFF G G Detects the presence of PS/2 mouse.
G OFF OFF Detects the presence of Keyboard in KBC port.
Testing and initialization of different Input Devices. Also, update the
Kernel Variables.
G G OFF
Traps the INT09h vector, so that the POST INT09h handler gets
control for IRQ1. Uncompress all available language, BIOS logo, and
Silent logo modules.
OFF G A Early POST initialization of chipset registers.
G R OFF Uncompress and initialize any platform specific BIOS modules.
OFF R R Initialize System Management Interrupt.
Initializes different devices through DIM.
OFF A OFF
See DIM Code Checkpoints section of document for more
information.
Initializes different devices. Detects and initializes the video adapter
G R OFF
installed in the system that have optional ROMs.
G A OFF Initializes all the output devices.
Allocate memory for ADM module and uncompress it. Give control to
OFF R A ADM module for initialization. Initialize language and font modules for
ADM. Activate ADM module.
Initializes the silent boot module Set the window for displaying text
Description
Altos G520