Specifications

Chapter 1: 7401-2xxx/3xxx Product Overview 1-25
Board BIOS
ProcessorboardsuseaPhoenixBIOS,whichisstoredinFlashROM
andeasilyupgradedthroughthenetworkconnectionorserialport.
TheFlashEEPROMalsocontainstheSetuputility,Power‐OnSelfTests
(POST),andAPM1.2(Release2.0‐2.4)orACPI2.0(Release2.5).The
boardsalsosupportssystem
BIOSshadowing,permittingtheBIOSto
executefromonboardwrite‐protectedDRAM.
TheBIOSdisplaysasign‐onmessageduringPOSTidentifyingthetype
ofBIOSandafour‐digitrevisioncode.
FLASH memory Implementation
TheIntelE28F800B5‐T70Flashcomponentisorganizedonboardas
1024kx8(1MB).Whilea
typicalPCBIOSimageincludingvideoand
LANbootROMcodenormallyfitsin256kBonthePentiumboardand
512kBonthePentiumIII/Celeronboard,theboardssupporta1MB
flashROM.ThecurrentPhoenixBIOSreleaseonlyrequires256kBof
this1MBtotal.
TheFlashdevicecontainsthePCSystemBIOSalong
withtheVideoBIOSandLANbootROMwhichcompressestheROM
imagesintoasinglebinaryimage.
TheFlashdeviceisdividedintofourareas,asdescribedbelow.
System Address FLASH Memory Area
F0000H FFFFFH 64kBMainBIOS
EE000H EFFFFH 8kBSystemBIOSReservedduringboot
ED000H EDFFFH 4kBPlugandPlayESCDStorageArea
E0000H ECFFFH 52kBSystem/VGABIOSReservedduringboot