Acer Altos G520 Altos G520 Service Guide - Page 82

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