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4 HP BIOS
BIOS Addresses
BIOS Addresses
This section provides a summary of the main features of the HP system
BIOS. This is software that provides an interface between the computer
hardware and the operating system.
The procedure for updating the System ROM firmware is described on page
30.
System Memory Map
Reserved memory used by accessory boards must be located in the area
from C8000h to EFFFFh. Memory resources for PCI and AGP accessories
are mapped above the physical top of memory.
0000 0000 - 0000 03FF Real-mode IDT
0000 0400 - 0000 04FF BIOS Data Area
0000 0500 - 0009 FC00 Used by OS
0009 FC00 - 0009 FFFF Extended BIOS Data Area
000A 0000 - 000B FFFF Video RAM
SMRAM (not visible unless in SMM)
000C 0000 - 000C 7FFF Video ROM
000C 8000 - 000D FFFF Adapter ROM, RAM, memory-mapped registers
000E 0000 - 000F FFFF 128 KB BIOS (Flash/Shadow)
0001 0000 - 000F FFFF Memory (1 MB to 16 MB)
0010 0000 - 001F FFFF Memory (16 MB to 32 MB)
0020 0000 003F FFFF Memory (32 MB to 64 MB)
0040 0000 - 01FF FFFF Memory (64 MB to 512 MB)
FEC0 0000 I/O APIC
FEE0 0000 Local APIC (each CPU)
FFFE 0000 - FFFF FFFF 128 KB BIOS (Flash)
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