Specifications

Chapter 2: 7401-4xxx Product Overview 2-19
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
BIOS Upgrades
FlashmemorymakesdistributingBIOSupgradeseasy.Anewversion
oftheBIOScanbeinstalledfromtheharddisk,networkorthrougha
serialport.
Thedisk‐basedFlashupgradeutilities,Phlash.exeandWinPhlash.exe,
ensuretheupgradeBIOSextensionmatchesthetargetsystemto
preventaccidentallyinstallingaBIOS
foradifferenttypeofsystem.