Hi all,
I'm wondering how to set up a proper device tree for a PCI bus. The bus
has a tree-like structure with several bridges and can be extended
dynamically (by adding PMC/XMC modules).
The structure looks like this:
----------------------
| MPC8641 |
| |
| BDF 0:0:0 |
----------------------
|
|Bus #1
|PCIe 8x
|
-----------------------------------------------
| PCIe switch | |
| ------------- |
| | BDF 1:0:0 | |
| ------------- |
| |Bus #2 |
| ----------------------------- |
| | | | |
| ----------- ------------ ----------- |
| |BDF 2:1:0| |BDF 2:2:0 | |BDF 2:3:0| |
| ----------- ------------ ----------- |
| |Bus #3 |Bus #5 |Bus #6 |
| |PCIe 4x |PCIe 2x |PCIe 2x |
-----------------------------------------------
| | |
----------- ------------ -----------
|Bridge | |Expansion | |SATA |
|BDF 3:0:0| |Slot | |BDF 6:0:0|
----------- ------------ -----------
|
|Bus #4
|PCI-X
----------------------
| |
------------ ------------
|VME Bridge| |PMC Slot |
|BDF 4:e:0 | |BDF 4:c:0 |
------------ ------------
A problem is that the modules in the Expansion/PMC slot can contain more
bridges and therefore the bus numbering isn't fixed. For example, if the
PMC adds one more bus, #5 becomes #6 and #6 becomes #7.
Can I assign fixed resources for all the bridge parts of the system?
Thanks
Thomas
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