Port Address: Difference between revisions

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The base port numbers and addresses
The base port numbers and addresses for the OLPC platform as established by [[Open Firmware]] are as follows.
for the Geode devices are established by MSR registers, 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: ===
=== I/O ports ===


18b0 : SMBUS
1000 : GPIO
1800 : MFGPT
1880 : IRQ mapper
1400 : PM
1841 : ACPI
1480 : AC-97. Audio Codec: Explanations are in [http://www.analog.com/UploadedFiles/Data_Sheets/AD1888.pdf Datasheet] Page 9


=== Memory space ===
18b0 SMBUS

1000 GPIO

1800 MFGPT

1880 IRQ mapper

1400 PM

1841 ACPI

1480 AC-97


=== Memory space: ===


fd000000 Frame buffer

fe000000 Graphics processor

fe004000 Video processor

fe008000 Display controller

fe01a000 OHCI (USB1)

fe01b000 EHCI (USB2)

efc00000 UOC (USB option controller)

fe00c000 CaFe NAND

fe010000 CaFe SD

fe014000 CaFe Camera



fd000000 : Frame buffer
fe000000 : Graphics processor
fe004000 : Video processor
fe008000 : Display controller.
Display/Video/Graphics Controller/processor: Explanation in Geode Gx [http://www.amd.com/files/connectivitysolutions/geode/geode_gx/31505E_gx_databook.zip datasheet] Chapter 6
fe01a000 : OHCI (USB1)
fe01b000 : EHCI (USB2)
efc00000 : UOC (USB option controller).
USB Controller: Explanation in AMD Geode Companion Device [http://www.amd.com/files/connectivitysolutions/geode/geode_lx/33238f_cs5536_ds.zip Databook] Chapter 5.5
fe00c000 : CaFe NAND
fe010000 : CaFe SD
fe014000 : CaFe Camera


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

[[Category:Hardware]]
[[Category:Software]]

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.