pcia and pcib PCI Busses
The Sun Ultra 30 UPA/PCI system has two PCI busses, pcia & pcib. The probing of slots for those busses are controlled by the following two NVRAM configuration variables.
Table E-1 PCI Slots|
Variable Name |
Default value |
Description |
|---|---|---|
|
pcia-probe-list |
1,2 |
Controls probe order of plug-in devices under pcia |
|
pcib-probe-list |
3,2,4,5 |
Controls probe order of plug-in devices under pcib |
pcia-probe-list corresponds to devices under /pci@1f,2000 and pcib-probe-list corresponds to devices under /pci@1f,4000.
pcia supports one plug-in client (slot 1, marked as "PCI 1, 66" ). It can support a device which is 64 bits wide and runs up to 66Mhz. Even though there is no client/slot under pcia corresponding to value 2, 2 is included in pcia-probe-list default value for historical reasons.
pcib supports three plug -in clients (slot 2,4, and 5; marked as "PCI 2", "PCI 3", and "PCI 4" respectively). pcib can support devices which are 64 bits wide and run upto 33Mhz.
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