Acer AC100S Acer AC100 Service Guide - Page 82

Boot from USB disk HDD 0 HDD 1 HDD 2 HDD 3 HDD 0 HDD 1 HDD 2 HDD 3 Backplane board temperature check PQAF system test PQAF memory test PQAF HDD test Read SN from DMI data check End test 6. After the diagnostic routine is completed, the HDD status indicator lights purple indicating the system has passed all diagnostic tests. 7. A copy of the test result will be saved as a log file (i.e., 66380AC3.LOG) and stored in the Results folder.The name of the log file is based on the last 8 bytes of the serial number Device Initialization Manager code checkpoints The Device Initialization Manager (DIM) module gets control at various times during BIOS POST to initialize different BUSes. The following table describes the main checkpoints where the DIM module is accessed: Checkpoint 2A 38 Description Initialize different buses and perform the following functions: Reset, Detect, and Disable (function 0); Static Device Initialization (function 1); Boot Output Device Initialization (function 2). Function 0 disables all device nodes, PCI devices, and PnP ISA cards. It also assigns PCI bus numbers. Function 1 initializes all static devices that include manual configured onboard peripherals, memory and I/O decode windows in PCI-PCI bridges, and noncompliant PCI devices. Static resources are also reserved. Function 2 searches for and initializes any PnP, PCI, or AGP video devices. Initialize different buses and perform the following functions: Boot Input Device Initialization (function 3); IPL Device Initialization (function 4); General Device Initialization (function 5). Function 3 searches for and configures PCI input devices and detects if system has standard keyboard controller. Function 4 searches for and configures all PnP and PCI boot devices. Function 5 configures all onboard peripherals that are set to an automatic configuration and configures all remaining PnP and PCI devices. While control is in the different functions, additional checkpoints are output to port 80h as a word value to identify the routines under execution. The low byte value indicates the main POST Code Checkpoint. The high byte is divided into two nibbles and contains two fields. The details of the high byte of these checkpoints are as follows: HIGH BYTE XY The upper nibble 'X' indicates the function number that is being executed. 'X' can be from 0 to 7. 0 = func#0, disable all devices on the BUS concerned. 1 = func#1, static devices initialization on the BUS concerned. 2 = func#2, output device initialization on the BUS concerned. 3 = func#3, input device initialization on the BUS concerned. 4 = func#4, IPL device initialization on the BUS concerned. 5 = func#5, general device initialization on the BUS concerned. 6 = func#6, error reporting for the BUS concerned. 7 = func#7, add-on ROM initialization for all BUSes. 8 = func#8, BBS ROM initialization for all BUSes. 76 Chapter 6