[LinuxBIOS] Configuring PCI devices

[Ed Swierk]

I'm working on porting LinuxBIOS to an AM2+MCP55-based mainboard (DFI
LANParty UT NF590) using the latest AMD Rev F and MCP55 southbridge
code from svn.

I replaced most of the CK804 PCI device IDs with their MCP55
counterparts, and put the following in my mainboard Config.lb:

chip northbridge/amd/amdk8/root_complex
        device apic_cluster 0 on
                chip cpu/amd/socket_AM2
                        device apic 0 on end
                end
        end
        device pci_domain 0 on
                chip northbridge/amd/amdk8 #mc0
                        device pci 18.0 on #  northbridge
                                #  devices on link 0, link 0 == LDT 0
                                chip southbridge/nvidia/ck804
                                        device pci a.0 on end
                                        device pci a.1 on end
                                        device pci c.0 on end
                                end
                        end #  device pci 18.0
                        device pci 18.0 on end # Link 1
                        device pci 18.0 on end # Link 2
                        device pci 18.1 on end
                        device pci 18.2 on end
                        device pci 18.3 on end
                end #mc0
        end # pci_domain
end # root_complex

Obviously this is not quite right, since I get the following output during boot:

Jumping to LinuxBIOS.
LinuxBIOS-2.0.0-FILO Thu Oct  5 11:34:43 PDT 2006 booting...
Enumerating buses...
APIC_CLUSTER: 0 enabled
PCI_DOMAIN: 0000 enabled
  PCI: 00:18.3 siblings=1
CPU: APIC: 00 enabled
CPU: APIC: 01 enabled
PCI: pci_scan_bus for bus 00
PCI: 00:18.0 [1022/1100] enabled
PCI: 00:18.1 [1022/1101] enabled
PCI: 00:18.2 [1022/1102] enabled
PCI: 00:18.3 [1022/1103] enabled
PCI: 00:1e.0 [10de/0369] enabled
PCI: 00:1f.0 [10de/0360] enabled
PCI: 00:1f.1 [10de/0368] enabled
PCI: 00:1f.2 [10de/036a] enabled
Disabling static device: PCI: 00:0a.0
PCI: pci_scan_bus for bus 00
PCI: 00:00.0 [10de/036c] enabled
PCI: 00:00.1 [10de/036d] enabled
PCI: 00:0a.0
PCI: 00:0a.1
PCI: 00:0c.0
PCI: Left over static devices.  Check your Config.lb

I'm pretty fuzzy on what exactly belongs in the device/chip section of
the Config.lb, and how this affects the PCI device enumeration during
boot (e.g. how did device 10de:036c get mapped to 00:00.0?). Is there
a document that explains this?

I've attached the output of lspci (using the factory BIOS), as well as
my modified pci_ids.h and cache_as_ram_auto.c.

Any pointers would be appreciated.

--Ed

[Stefan Reinauer]

* Ed Swierk  [061005 21:00]:
> PCI: 00:00.0 [10de/036c] enabled
> PCI: 00:00.1 [10de/036d] enabled
> PCI: 00:0a.0
> PCI: 00:0a.1
> PCI: 00:0c.0
> PCI: Left over static devices.  Check your Config.lb
>
> I'm pretty fuzzy on what exactly belongs in the device/chip section of
> the Config.lb, and how this affects the PCI device enumeration during
> boot (e.g. how did device 10de:036c get mapped to 00:00.0?). Is there
> a document that explains this?

I think when you see this error the following happens:

You are mentioning some device in the tree description which can not be
found in the real system, so LinuxBIOS assumes there is something wrong
with your bios image and refuses to continue.

The first thing that looks suspicious is the CK804. LinuxBIOS probably
finds the NForce5 instead of the expected NForce4 and pegs out.

Please also check that the components are hanging off the correct
hypertransport link.

There is this funny notion in LinuxBIOS that you see

pci 18.0 ... end 3 times, which reflects the 3 hypertransport links per
CPU.

To find out which one is the correct one, you can read out the CPU's HT
config registers with factory bios, or read the mainboard schematics.

Stefan