10 BIOS Operation

Cache Memory

 

 

Feature

 

Option

 

Description

 

 

Memory Cache

 

 

Enabled

 

Enables/disables the memory cache system

 

 

 

 

 

Disabled

 

 

 

 

 

 

 

 

 

 

 

 

Cache System BIOS area

 

Write Protect

 

Cache setting for System BIOS area

 

 

Cache Video BIOS area

 

 

uncached

 

Cache setting for System BIOS area

 

 

 

Cache Base 0-512k

 

 

Uncached

 

 

 

 

 

 

Cache Base 512k-640k

 

Write Through

 

 

 

 

 

 

Cache Extended Memory Area

 

 

Write Protect

 

 

 

 

 

 

 

 

Write Back

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cache A000 - AFFF

 

 

Disabled

 

 

 

 

 

 

 

 

 

USWC Caching

 

 

 

 

 

 

Cache B000 - BFFF

 

 

Write Through

 

 

Uncached = Disabled: This block is not

 

 

 

 

 

Write Protect

 

 

cached at all

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Write Back

 

 

USWC Caching: Uncached Speculative Write

 

 

 

Cache C800 - CBFF

 

Disabled

 

 

Combined

 

 

 

 

 

 

Write Through

 

 

Write Through: Writes are cached and send

 

 

 

Cache CC00 - CFFF

 

 

Write Protect

 

 

to main memory at once

 

 

 

 

 

 

Write Back

 

 

Write Protect: Writes are ignored

 

 

 

Cache D000 - D3FF

 

Disabled

 

 

Write Back: Writes are cached, but not sent

 

 

 

Cache D400 - D7FF

 

Write Through

 

 

to main memory until necessary

 

 

 

Cache D800 - DBFF

 

 

Write Protect

 

 

 

 

 

 

Cache DC00 - DFFF

 

Write Back

 

 

 

 

 

 

Cache E000 - E3FF

 

Disabled

 

 

 

 

 

 

Cache E400 - E7FF

 

 

Write Through

 

 

 

 

 

 

Cache E800 - EBFF

 

Write Protect

 

 

 

 

 

 

Cache EC00 - EFFF

 

Write Back

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Kontron User's Guide ETX CD

69

Page 69
Image 69
Intel ETX CD manual Cache Memory, Write Protect