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Chapter 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 in the section
“Updating the System ROM” in the chapter “System Board.”
System Memory Map
Reserved memory used by accessory boards must be located in the area from C8000h to
EFFFFh.
Table 4-3. System Memory Map
0000 0000 - 0000 03FF
Real-mode IDT
0000 0400 - 0000 04FF
BIOS Data Area
0000 0500 - 0009 FC00
Used by Operating System
0009 FC00 - 0009 FFFF
Extended BIOS Data Area
000A_0000 - 000B_FFFF
Video RAM or SMRAM (not visible unless in SMM)
000C 0000 - 000C 7FFF
Video ROM (VGA ROM)
000C 8000 - 000F FFFF
Adapter ROM, RAM, memory-mapped registers, BIOS
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 0000-007F FFFF
Memory (64 MB to 128 MB)
0080 0000-7FFF FFFF
Memory (128 MB to 2 GB)
FECO 0000
I/O APIC
FEEO 0000
Local APIC (each CPU)
FFFE 0000-FFFF FFFF
128 KB BIOS (Flash)
Summary of Contents for X Class 500/550MHz
Page 6: ...6 Contents ...
Page 8: ...8 Figures ...
Page 15: ...15 1 System Overview ...
Page 66: ...66 Chapter2 System Board Devices on the ISA Bus ...
Page 96: ...96 Chapter3 Interface Boards and Mass Storage Drivers Connectors and Sockets ...
Page 134: ...134 Chapter5 Tests and Error Messages Beep Codes ...
Page 135: ...135 A Regulatory Information and Warranty ...
Page 146: ...146 AppendixA Regulatory Information and Warranty HP Hardware Warranty ...