2 Troubleshooting Procedures

2.4 System Board Troubleshooting

 

 

Table 2-3

D port status (1/7)

 

 

 

 

 

 

 

D port status

Inspection items

 

Details

 

 

 

 

 

 

 

 

F000h

Start

 

Clearing a software reset bit

 

 

 

 

 

 

 

 

 

 

 

Enabling address line A20

 

 

 

 

 

 

 

 

 

 

 

Initializing Ali

 

 

 

 

 

Initializing Intel North Bridge

 

 

 

 

 

Setting LPC port

 

 

 

 

 

Disabling AC’97 Modem/Audio

 

 

 

 

 

Corresponding KBC Serial IRQ

 

 

 

 

 

Setting of enabling PM timer

 

 

 

 

 

 

 

 

 

 

 

Dummy-reading 3rd Bus date

 

 

 

 

 

 

 

 

 

 

 

Initializing debug port

 

 

 

 

 

 

 

 

 

 

 

Initializing the CH0 of a PIT

 

 

 

 

 

 

 

 

 

 

 

Initializing flags determining whether BIOS is rewritten

 

 

 

 

 

 

 

 

 

 

 

CHECK SUM CHECK

 

 

 

 

 

Switching to protected mode

 

 

 

 

 

Examining the checksum of BootBlock (skips when S3

 

 

 

 

 

returns), HLT at checksum error

 

 

 

 

 

Examining the checksum of other data in a flash memory

 

 

 

 

 

(skips when S3 returns)

 

 

 

 

 

 

 

 

F001h

Checking if EC/KBC

 

Checking if EC/KBC firmware is to be rewritten

 

 

 

firmware is to be rewritten

 

When is to be rewritten, goes to Rewriting BIOS routine.

 

 

 

 

 

When S3 returns, moves the process to the System BIOS

 

 

 

 

 

IRT side.

 

 

 

 

 

Initializing a KBC

 

 

 

 

 

Enabling KB

 

 

 

 

 

 

 

 

F002h

Checking whether BIOS

 

Checking if BIOS is to be rewritten

 

 

 

rewrite is requested

 

When rewriting by checksum error other than of BootBlock

 

 

 

 

 

or a user is requested, goes to BIOS rewriting process.

 

 

 

 

 

 

 

 

F003h

 

 

Changing the process to the System BIOS IRT side

 

 

 

 

 

 

 

 

 

 

 

Initializing specific for the system

 

 

 

 

 

 

 

 

 

 

 

Selecting USB controller clock

 

 

 

 

 

 

 

 

 

 

 

Initializing HW specific for model

 

 

 

 

 

 

 

 

 

 

 

Initializing PIT channel 1 ( Refresh interval30μs)

 

 

 

 

 

 

 

 

 

 

 

Initializing PIT, DMAC, PIC

 

 

 

 

 

 

 

 

 

 

 

Enabling L1 Cache

 

 

 

 

 

 

 

 

 

 

 

Clearing memory

 

 

 

 

 

 

 

 

 

 

 

Moving to real mode and copying BIOS to RAM

 

 

 

 

 

 

 

2-20

PORTEGE A100 Maintenance Manual (960-460)

Page 61
Image 61
Toshiba A100 manual Port status Inspection items Details

A100 specifications

The Toshiba A100 series represents a notable range of laptops that combines performance and versatility, catering specifically to the needs of both casual users and professionals. Launched with an emphasis on multimedia capabilities and productivity, the A100 series showcases an array of features designed to enhance the user experience.

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Connectivity options are comprehensive, with multiple USB ports, HDMI outputs, and a multi-card reader. This ensures that users can easily connect to peripherals, external displays, and transfer files with ease. The inclusion of Wi-Fi and Bluetooth capabilities facilitates seamless integration into modern home and office environments.

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