Hello,
I was using kernel version 2.6.14 (ppc) on a MVME3100 board (MPC8540
processor). We are planning to move to 2.6.20 (powerpc), but I have some
problems with the initialization of a PCI-PCI bridge.
Connected to the MVME3100 board is a PCI-PCI bridge (HiNT, PCI6150,
3388:0022). When using the 2.6.14 kernel this bridge is initialized
correctly: it is setup as bus-master, memory and IO are configured, and
the memory allocation on the PCI-bus is correct.
When I use 2.6.20 (powerpc) the device is not configured correctly:
bus-master, memory and IO are not set, and the memory space of the
bridge on the PCI bus is set to the minimum value (0xfffff).
I can correct these settings by modifying the PCI_COMMAND register to
set the bus-master, memory and IO. I change the size of the memory space
in pci_32.c, by forcing the size to the required setting in
pci_relocate_bridge_resource. But to be honest, I don't like this very
much: modifying registers like this should not be needed, so I guess
there is something wrong in my configuration or setup.
How can I fix this problem in a better way? What could be wrong with my
configuration?
Below is some output from lspci:
bash-3.00# lspci -t
-[0000:00]-+-01.0
+-02.0-[0000:01]--
+-03.0-[0000:02-03]--+-00.0
| +-00.1
| +-00.2
| \-04.0-[0000:03]--+-02.0
| \-03.0
\-04.0
bash-3.00# lspci -vs 02:04.0
02:04.0 PCI bridge: Hint Corp HiNT HB4 PCI-PCI Bridge (PCI6150) (rev 04)
(prog-if 00 [Normal decode])
Flags: bus master, medium devsel, latency 0
Bus: primary=02, secondary=03, subordinate=03, sec-latency=0
I/O behind bridge: 00011000-00011fff
Memory behind bridge: 87f00000-87ffffff
Prefetchable memory behind bridge: 0000000087e00000-0000000087e00000
Capabilities: [dc] Power Management version 1
Capabilities: [e4] #06 [0094]
Capabilities: [e8] Vital Product Data
After the modifications to the PCI COMMAND register and memory map:
bash-3.00# lspci -vs 02:04.0
02:04.0 PCI bridge: Hint Corp HiNT HB4 PCI-PCI Bridge (PCI6150) (rev 04)
(prog-if 00 [Normal decode])
Flags: stepping, medium devsel
Bus: primary=02, secondary=03, subordinate=03, sec-latency=0
I/O behind bridge: 00011000-00011fff
Memory behind bridge: 82000000-87ffffff
Prefetchable memory behind bridge: 0000000000000000-0000000000000000
Capabilities: [dc] Power Management version 1
Capabilities: [e4] #06 [0094]
Capabilities: [e8] Vital Product Data
Kind regards,
Johan Borkhuis
--
Johan Borkhuis Dutch Space BV
email: [EMAIL PROTECTED] Newtonweg 1
phone: 071-5245788 Leiden
fax: 071-5245499 The Netherlands
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