Memory Map - AMD Geode CS5535 Porting Manual

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