System I/O Addresses/Memory Map/PCI Configuration and Device
Map/Interrupts/Video Mode Assignments A-3
Memory Map
Table A-2 lists the system memory map. In Table A-2 the addresses are listed in
hexadecimal notation. When BIOS allocates memory space to PCI devices, it
starts just below the APICs and continues downward. Assigning memory space
to PCI devices does not decrease the total available memory in the system
because this memory is “reclaimed” above 4 GB.
The server does not support memory gaps from 512 KB to 640 KB and from
15 MB to 16 MB. These regions are treated as normal system memory.
Table A-2. Memory Map
Address Range
Amount
Function
00000000 – 0009FFFF
640K
Base (conventional) System Memory
000A0000 – 000AFFFF
128K
ISA Video buffer
000C0000 – 000D7FFF
96K
Add-in Options ROM’s (Video, SCSI…)
000C0000 – 000D7FFF
96K
Add-in Options ROM’s
000D8000 – 000DBFFF
16K
Allocated to Run time user binary if
enabled/programmed, otherwise can be used for options
ROM’s
000DC000 – 000DFFFF
16K
Allocated to Console Redirection if enabled, otherwise
can be used for options ROM’s
000E0000 – 000FFFFF
128K
System BIOS Shadowed
00100000 – PCI Memory
allocated to first PCI device
Typically it can go up to 3GB
FEC00000 – FEC0FFFF
64K
Reserved.
Unused on this platform
Reclaimed.
If main memory exceeds this region
FEC10000 – FEC1FFFF
64K
IOAPIC allocated to the PID
Reclaimed.
If main memory exceeds this region
FEC20000 – FECFFFFF
896K
Reserved
Reclaimed.
If main memory exceeds this region
FEE00000 – FEF00000
1MB
LOCAL APIC
Reclaimed.
If main memory exceeds this region
FF000000 – FFDFFFFF
14MB
Unused.
Reclaimed.
If main memory exceeds this
region
FFE00000 – FFFFFFFF
2MB
Main System BIOS
100000000 – 1FFFFFFFF
4GB
If memory exists
Summary of Contents for Express5800/180Rb-7
Page 1: ... U s e r s G u i d e EXPRESS5800 180Rb 7 ...
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Page 10: ...viii Contents ...
Page 58: ...2 24 Setting Up the System ...
Page 146: ...4 40 Upgrading Your System ...
Page 166: ...5 20 Problem Solving ...
Page 186: ...10 Glossary ...
Page 190: ...4 Equipment Log ...
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