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AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM Porting Guide 31
7
Memory Map 32430C
7.0Memory Map
Figures 7-1, 7-2, and 7-3 show the system memory. Figure 7-1 is the GLIU Descriptor Map, Figure 7-2 shows the Core
Cache descriptors, and Figure 7-3 on page 32 shows the Core cache region configurations.
Figure 7-4 on page 33 shows the flow of GeodeROM in the GX processor/CS5535 system.
Figure 7-1. GLIU Descriptor Map
Figure 7-2. CPU Core Cache Descriptors
Memory Descriptors
BM - Base Mask
R - Range
SC - Swiss Cheese
BMO - Base Mask Offset
RO - Range Offset
No Swiss Cheese Offset
ROM
Subtractive to PCI
Subtractive to PCI
Subtractive to PCI
Memory Mapped VSA
Subtractive to PCI
Memory Mapped Frame Buffer
Memory Mapped Video Registers
Subtractive to PCI
Frame Buffer
VSA
Extended Memory
System and Option ROMs
FFFFFFFFh (4 GB)
FFFC0000h
40400000h
50000000h
Top of DRAM
Top of System
(OS) RAM
A0000h - 100000h (640 KB - 1 MB)
VSA Offset
Frame Buffer Offset
Video Descriptors
(RO, VP + GP + DC)
Frame Buffer Descriptors
(RO, GLMC)
SMM Descriptor (RO, GLMC)
SysTop Descriptor (R, GLMC)
Two Shadow Descriptor (SC, GLMC)
A0000h - DFFFFh, E0000h-11FFFh
Conventional Memory
Two Conv Desc (BM, MC)
0-7FFFFh, 80000h-9FFFFh
Subtractive to PCI
VSA and Video Memory
subtracted from
Extended Memory