Epson ETX-945 user manual Bios Post Codes, Code Function

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5.4BIOS POST Codes

The POST codes used by the ETX-945’s on-board BIOS appear in the table below.

Code

Function

 

 

 

 

 

CFh

Test CMOS read/write functionality

 

 

 

C0h

Early chipset initialization: Disable shadow RAM, L2 cache (socket 7 and below), program

 

basic chipset registers

 

 

 

C1h

Detect memory: Auto detection of DRAM size, type and ECC, auto detection of L2 cache

 

(socket 7 and below)

 

 

 

 

C3h

Expand compressed BIOS code to DRAM

 

 

 

 

C5h

Call chipset hook to copy BIOS back to E000 & F000 shadow RAM

 

 

 

01h

Expand the Xgroup codes located in physical memory address 000:0

 

 

 

 

02h

Reserved

 

 

 

 

 

03h

Initial Super I/O_Early Init switch

 

 

 

 

 

04h

Reserved

 

 

 

 

 

05h

Blank out screen; Clear CMOS error flag

 

 

 

 

 

06h

Reserved

 

 

 

 

 

07h

Clear 8042 interface; Initialize 8042 self test

 

 

 

08h

Test special keyboard controller for Winbond 977 series Super I/O chips; enable keyboard

 

interface

 

 

 

 

 

 

09h

Reserved

 

 

 

 

0Ah

Disable PS/2 mouse interface (optional); auto-detect ports for keyboard and mouse

 

followed by a port and interface swap (optional); reset keyboard for Winbond 977 series

 

Super I/O chips

 

 

 

 

 

 

0Bh-

Reserved

 

 

0Dh

 

 

 

 

 

0Eh

Test F000h segment shadow to see whether it is read/write capable or not. If test fails,

 

keep beeping the speaker

 

 

 

 

 

0Fh

Reserved

 

 

 

 

10h

Auto detect flash type to load appropriate flash read/write codes into the run time area in

 

F000 for ESCD & DMI support

 

 

 

 

 

11h

Reserved

 

 

 

 

12h

Use “walking 1’s” algorithm to check out interface in CMOS circuitry. Also set real time

 

clock power status and then check for override

 

 

 

 

 

13h

Reserved

 

 

 

 

 

ETX-945 User Manual 1.00

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Page 35

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Contents High-Performance ETX 3.0 Compliant Computer-on-Modules Contents Important SAFE-HANDLING Information Safe Handling PrecautionsRAM FeaturesIntroduction USB BiosETX-945 Models Functional Overview Block DiagramBoard Layout Top Board Dimensions, Mounting Holes, and ConnectorsBoard Layout Bottom Other Interface Connectors Bus and Interface Connector SummaryETX Bus Connectors Getting Started ETX Development Kits Configuring the HardwareAdvanced Bios Features Booting the SystemBios Setup Utility Standard Cmos FeaturesIntegrated Peripherals Advanced Chipset FeaturesPower Management Setup NTSC, PALOperating System Drivers Bios Beep Code List6 PnP/PCI Configuration Other Settings and UtilitiesInterface Connector Details ETX1 Connector PCI bus signals Audio interface USB signalsReserved Miscellaneous functionsVCC GNDETX2 Connector ETX3 Connector TV video output Analog video outputSerial port interfaces LCD interfaceParallel port interface Keyboard, mouse, and infrared transceiver interfacesFloppy drive interface LTGIO0 ETX4 Connector IDE interfaces Signal Name Signal Function DirectionEthernet port Power control and managementMiscellaneous signals Sata ConnectorsLAN ROM Bios Memory MappingVGA Bios Appendix System Resources ReferenceAddress Device Description I/O Port Address MapPage IRQ Level Function Interrupt Request IRQ LinesCode Function Bios Post CodesPage Page

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