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AMD Geode™ GX Processor/CS5535 Companion Device GeodeROM Porting Guide 23
Initialization
32430C
4.2.4.10 DD I/O Locations
4.2.5 ATA-5 / Hard Drive Initialization
Hard drive initialization is handled by a system ROM that is loaded by GeodeROM. The hard drive ROM contains the hard
drive initialization, the PIO modes support, and the interrupt support.
New to the hard drive ROM is the UDMA setup, so that default drivers may be used in some operating systems. The UDMA
setup includes detecting the 80-conductor IDE cable for UDMA/66 support.
4.2.6 Universal Serial Bus (USB)
There are two Universal Serial Bus Controllers (USBCs) each containing a GeodeLink™ Adapter, PCI Adapter, and USB
Core blocks. The GeodeLink Adapter (GLA) translates GeodeLink transactions to/from Local bus transactions. The GLA
interfaces to a 64-bit GLIU (GeodeLink Interface Unit) and a 32-bit Local bus. The GLA supports in-bound memory and I/O
requests, which are converted by the PCI Adapter (PA) into PCI memory and I/O requests that target the USBC. It also sup-
ports in-bound MSR transactions to the MSRs.
4.2.7 AC97 Audio Controller Initialization
The audio codec is initialized by the native audio driver. The virtual PCI header contains the IRQ line. The IRQ is set
through the regular PCI initialization and IRQ mapping.
Table 4-2. Diverse Device I/O Locations
Location Device
0020h PIC Master Command and Status
0021h PIC Master Command and Status
0060h USB - Keyboard and Mouse Data
0064h USB - Keyboard and Mouse Command and Status (KEL)
0070h RTC Address
0071h RTC Data
00A0h PIC Slave Command and Status
00A1h PIC Slave Command and Status
02E8h UART/IR COM4
02F8h UART/IR COM2
03E8h UART/IR COM3
03F8h UART/IR COM1
04D0h PCI Level/Edge IRQ0-7
04D1h PCI Level/Edge IRQ8-15
6000h SMBus
6100h GPIO and ICF
6200h General Purpose Timers
6400h Flash BAR
6500h Flash BAR
6600h Flash BAR
6700h Flash BAR
9C00h ACPI - Subdivide to support GX processor and CS5535 companion device
9D00h Power Management Logic - Placed at the end of ACPI