Acer Aspire X1930 Service Manual

Contents

Acer Aspire X1930 Service Manual Manual pdf 56 page image

48 Aspire AX1930 Service GuidePOST Code CheckpointsThe POST code checkpoints are the largest set of checkpoints during the BIOS preboot process. Thefollowing table describes the type of checkpoints that may occur during the POST portion of the BIOS.Checkpoint Description03 Disable NMI, Parity, video for EGA, and DMA controllers. Initialize BIOS, POST, Runtimedata area. Also initialize BIOS modules on POST entry and GPNV area. Initialized CMOSas mentioned in the Kernel Variable "wCMOSFlags."04 Check CMOS diagnostic byte to determine if battery power is OK and CMOS checksum isOK. Verify CMOS checksum manually by reading storage area.If the CMOS checksum is bad, update CMOS with power-on default values and clearpasswords. Initialize status register A.Initializes data variables that are based on CMOS setup questions.Initializes both the 8259 compatible PICs in the system05 Initializes the interrupt controlling hardware (generally PIC) and interrupt vector table.06 Do R/W test to CH-2 count reg. Initialize CH-0 as system timer.Install the POSTINT1Chhandler. Enable IRQ-0 in PIC for system timer interrupt. Traps INT1Ch vector to"POSTINT1ChHandlerBlock."08 Initializes the CPU. The BAT test is being done on KBC. Program the keyboard controllercommand byte is being done after Auto detection of KB/MS using AMI KB-5.0A Initializes the 8042 compatible Key Board Controller.0B Detects the presence of PS/2 mouse.0C Detects the presence of Keyboard in KBC port.0E Testing and initialization of different Input Devices. Also, update the Kernel Variables.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 Early POST initialization of chipset registers.24 Uncompress and initialize any platform specific BIOS modules. GPNV is initialized at thischeckpoint.30 Initialize System Management Interrupt.2A Initializes different devices through DIM.See DIM Code Checkpoints section for more information.2C Initializes different devices. Detects and initializes the video adapter installed in thesystem that have optional ROMs.2E Initializes all the output devices.31 Allocate memory for ADM module and uncompress it. Give control to ADM module forinitialization. Initialize language and font modules for ADM. Activate ADM module.33 Initializes the silent boot module. Set the window for displaying text information.37 Displaying sign-on message, CPU information, setup key message, and any OEMspecific information.38 Initializes different devices through DIM. See DIM Code Checkpoints section for moreinformation. USB controllers are initialized at this point.39 Initializes DMAC-1 & DMAC-2.3A Initialize RTC date/time.3B Test for total memory installed in the system. Also, Check for DEL or ESC keys to limitmemory test. Display total memory in the system.