Bios Addresses; System Memory Map - HP Kayak XA Technical Reference Manual

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
50.

System Memory Map

Reserved memory used by accessory boards must be located in the area
from C8000h to EFFFFh.
0000 0000 - 0000 03FF
0000 0400 - 0000 04FF
0000 0500 - 0009 FC00
0009 FC00 - 0009 FFFF
000A_0000 - 000B_FFFF
000C 0000 - 000C 7FFF
000C 8000 - 000F FFFF
000E 0000 - 000F FFFF
10 0000 - FF FFFF
100 0000 - 1FF FFFF
200 0000 -3FF FFFF
400 0000 -1FFF FFFF
FFFE 0000 - FFFF FFFF
1.
This is for Physical memory. As soon as the PST has
been completed, the E000-EFFF area has to be re-
leased for UMBs.
80
Real-mode IDT
BIOS Data Area
Used by OS
Extended BIOS Data Area
Video RAM or
SMRAM (not visible unless in SMM)
Video ROM
Adapter ROM, RAM, memory-mapped registers
1
128 KB BIOS (Flash/Shadow)
Memory (1 MB to 16 MB)
Memory (16 MB to 32 MB)
Memory (32 MB to 64 MB)
Memory (64 MB to 512 MB)
128 KB BIOS (Flash)
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