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AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide AMD Geode™ GX Processor/ CS5535 Companion De vice GeodeR OM P or ting Guide April 2006 Publicat ion ID: 32430C.
2 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide © 2006 Advanced Micr o Devices, Inc. All rights reser ved. The contents of this docu ment are pr ovided in connection with Adv anced Micro Devices , Inc. (“AMD”) products.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 3 Contents 32430C Contents List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 List of Tables .
4 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Contents 32430C.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 5 List of Figures 32430C List of Figures Figure 3-1. GeodeLink™ Architecture To pology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 Figure 4-1.
6 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide List of Figures 32430C.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 7 List of T ables 32430C List of T ab les Table 4-1. Default Region Configuration Properties Bit Desc riptions . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 4-2.
8 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide List of T ables 32430C.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 9 1 Overview 32430C 1.0 Ov er vie w 1.1 Intr oduction This document descr ibes the changes neede d f or GeodeROM and other BIOSs to suppor t th e AMD Geode™ GX proces- sor and the AMD Geode™ CS5535 co mpanion device.
10 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Assumption 32430C.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 11 2 Model Specific Registers 32430C 2.0 Model Specific Registers There are two wa ys to read o r write Mode l Specific Registers (MSRs) in a Geode™ GX proces sor system.
12 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Model Specific Registers 32430C.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 13 3 GeodeLink™ Architecture 32430C 3.0 GeodeLink™ Architecture GeodeLink™ architecture connects the inter nal mo dules of th e AMD Geode™ GX processo r using the data channels pro- vided by GeodeLink Interf ace Units (GLI Us).
14 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide GeodeLink™ Architecture 32430C 3.1 GeodeLink™ MSR Addressing The GX processor’ s MSRs are addressed from th e source module to the por t of the target module. The topology of the GX processor must be understood to derive the address.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 15 4 Initialization 32430C 4.0 Initialization 4.1 Processor Initialization The AMD Geode™ GX processor contains many of the components n ormally found in system suppor t chi psets.
16 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Initialization 32430C 4.1.2 Cal culating Pro cessor Speed Entr y Conditions: Stack and No-Stack v ersions required. 8254 timer availab le (por t 61). Procedure: • Utilize the Real Time Stamp Counter (R TSC).
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 17 Initialization 32430C 4.1.3.1 Size Memor y Entr y Conditions: 4 GB descriptor in FS Core register.
18 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Initialization 32430C 4.1.5.1 GLIU Descripto rs Initial ization Register: P2D_BM, P2D_BMO , P2D_R, P2D_RO , P2D_SC (G LIU0.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 19 Initialization 32430C Registers: CR0 RCONF MSRs: CPU Core MSR Address 00001808h-00001817h Instru ction Memor y Configuratio.
20 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Initialization 32430C 4.2 AMD Geode™ CS5535 Compan ion Device Initialization The Geode™ CS5535 is a complete compani on de vice to the GX processor .
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 21 Initialization 32430C 4.2.4.1 IRQ Mapper The XPIC has sev eral incoming sources. They are IRQ, LPC , Y , and Z sources. The Y sources include software , USB, R T C alarm, audi o , power management, NAND Flash, SMB , KEL, and UAR Ts.
22 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Initialization 32430C 4.2.4.6 A CPI 4.2.4.7 P ower Management Logic 4.2.4.8 Flash Interface 4.2.4.9 Other Legacy DD Initializatio n Location: 9C00h or other nor mal ACPI location.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 23 Initialization 32430C 4.2.4.10 DD I/O Locations 4.2.5 A T A-5 / Hard Drive Initialization Hard drive initialization is handled by a system ROM that is loaded by GeodeROM.
24 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Initialization 32430C 4.2.8 GeodeLink™ Contr ol Processor Initializatio n The Geode CS5535 GL CP contains the diagnostic bus, the JT AG interf ace clock, south bridge control, and power manage- ment.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 25 Initialization 32430C 4.5 Miscellaneous Initializations In addition to the previous processor initializations, the graphics card(s) m ust also be initialized. 4.5.1 Initialize Graphics Subsystem There are two different modes: CR T and TFT .
26 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Initialization 32430C.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 27 5 Implementation 32430C 5.0 Implementation 5.1 Implementation The follo wing is a collection of imp lementation details to consid er in the GeodeROM implementation phase. 5.1.
28 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Implementation 32430C.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 29 6 Setup Options 32430C 6.0 Setup Options Initial configuration is set in the configur ator at build time. Based on those settings, there are some setup options at r untim e that are platform specific.
30 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide 32430C.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 31 7 Memory Map 32430C 7.0 Memor y 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.
32 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Memory Map 32430C Figure 7-3. CPU Core Cache Region Configurations ROM PCI Memor y Mapped PCI PCI Memor y Mapped VSA PCI M.
AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 33 Memory Map 32430C Figure 7-4. GeodeR OM Flow - GX Process or/CS5535 Devi ce Reset ROM Fe tc h CPU ID Correct? F ailed to Bo.
34 AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P or ting Guide Memory Map 32430C Figure 7-4 "Geo deROM Flo w - GX Proc essor/CS5535 De vice" (Contin ued) Finish Post Setup Sta.
A AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM P orting Guide 35 Appendix A: Suppor t Document ation 32430C Appendix A Suppor t Documentation A.1 Document Revision History This section repor ts the revision/creation process of the por ting guide.
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