AMD AMD5K86 - Memory-Decoder Aliasing of Boot ROM Space

AMD~
18524B/0-Mar1996 AMD5~6 Processor Technical Reference Manual
4 Gbyte
,-------
Hardware
Alias
I
I
I
I
Boot ROM
Extended
(expanded)
Memory
FFFF JFFF
FFFF_COOO
... ------,
I 1 Mbyte 1-----------1 000 F _FFF F
1... ______ -.
BIOSROM ---
Device ROM ---
Memory-Mapped I/O ---
640 Kbyte
DOS Kernel ---
BIOS Data ---
Aliased Boot ROM
High
Memory
Low
(conventional)
Memory
OOOF_COOO
... ______ J
I
I
I
I
I
BIOS
Remap
During Boot
0003 FFFF SMM __ .J
0003_8000 Memory
InterruptVeclors --- 0000_0000
'-----_ ..
Decimal
Hexadecimal
FIGURE 6-1. Typical Desktop-System BIOS Memory Map
Memory
6-1