HP Vectra XE310 Technical Information download pdf (Page 29)

BIOS Overview

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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.

System Memory Map

Reserved memory used by accessory boards must be located in the area from C8000h to EFFFFh.

HP I/O Port Map (I/O Addresses Used by the System)

Peripheral devices, accessory devices and system controllers are accessed via the system I/O space,

which is not located in system memory space. The 64KB of addressable I/O space comprises 8-bit and 16-

bit registers (called I/O ports) located in the various system components. When installing an accessory

board, ensure that the I/O address space selected is in the free area of the space reserved for accessory

boards (100h to 3FFh).

Although the Setup program can be used to change some of the settings, the following address map is

not completely BIOS dependent, but is determined partly by the operating system. Note that some of the

I/O addresses are allocated dynamically.

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

000C 0000 - 000C 7FFF Video ROM

000C 8000 - 000F FFFF Adapter ROM, RAM, memory-mapped registers

000E 0000 - 000F FFFF System BIOS (Flash/Shadow)

10 0000 - FF FFFF Memory (1MB to 16MB)

100 0000 - 1FF FFFF Memory (16MB to 32MB)

200 0000 -3FF FFFF Memory (32MB to 64MB)

400 0000 -1FFF FFFF Memory (64MB to 512MB)

1.Depending on physical memory size, the SMRAM is configured as the last 512 KB of physical memory

and video memory (UMA) will be mapped in a 1 MB segment before SMRAM.

FFF80000 - FFFF FFFF 512KB BIOS (Flash)

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HP Vectra XE310 Technical Information Page 29