Port Address: Difference between revisions
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The base port numbers and addresses for the |
The base port numbers and addresses for the OLPC platform as established by [[Open Firmware]] are as follows. |
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'''Please note''' - these ports and addresses are written to MSR registers by the firmware - other Geode BIOS implementations may use different values. When in doubt, you can always get the base addresses by scanning the PCI configuration. |
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=== I/O ports === |
=== I/O ports === |
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Latest revision as of 17:42, 6 October 2012
The base port numbers and addresses for the OLPC platform as established by Open Firmware are as follows.
Please note - these ports and addresses are written to MSR registers by the firmware - other Geode BIOS implementations may use different values. When in doubt, you can always get the base addresses by scanning the PCI configuration.
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.