Port Address

The base port numbers and addresses for the Geode devices are established by MSR registers, as follows:

I/O ports:

18b0 SMBUS

1000 GPIO

1800 MFGPT

1880 IRQ mapper

1400 PM

1841 ACPI

1480 AC-97

• Audio Codec: Explanations are in Datasheet Page 9

Memory space:

fd000000 Frame buffer

fe000000 Graphics processor

fe004000 Video processor

fe008000 Display controller

• Display/Video/Graphics Controller/processor: Explanation in Geode Gx datasheet Chapter 6

fe01a000 OHCI (USB1)

fe01b000 EHCI (USB2)

efc00000 UOC (USB option controller)

• USB Controller: Explanation in AMD Geode Companion Device Databook Chapter 5.5

fe00c000 CaFe NAND

fe010000 CaFe SD

fe014000 CaFe Camera

These addresses can be "discovered" by doing PCI configuration reads to PCI device base address registers or by browing the Open Firmware device tree. link title