MPC8548 PCIe / PCI support with BSP MPC8548CDS 02/24/2006

Hi,

I am currently working on a MPC8548-based development system.
Linux kernel version is 2.6.11 with patches delivered from Freescale 
(BSP MPC8548CDS 02/24/2006).

Kernel configuration contains a warning message for CONFIG_PEX:
"This requires hardware modification to work correctly if your CPU 
version < 2.0 and will break the PCI bus. [...]"

I was wondering whether enabling PCIe makes PCI bus functionality 
unusable at all (including kernel functionality for detecting devices 
behind a transparent PCI-to-PCI bridge).

Our setup connects a transparent PLX8516 PCI-to-PCI bridge to the PCIe 
port of the MPC8548 daughter board. Behind that bridge is another PCIe 
capable device.
MPC8548 is configured to run as PCIe host mode.

When trying to lookup the PCIe devices using lspci I can only see the 
PPC itself and the bridge.
However I cannot see the device(s) behind the bridge.

Is there another method for detecting PCI(e) devices?
Is "BSP MPC8548CDS 02/24/2006" the latest version corresponding to that 
hardware?

Thanks in advance,

   Florian

On Mon, 26 Jun 2006 12:48:27 +0200
Florian Boelstler [off-list ref] wrote:

Hi,
=20
I am currently working on a MPC8548-based development system.
Linux kernel version is 2.6.11 with patches delivered from Freescale=20
(BSP MPC8548CDS 02/24/2006).
=20
Kernel configuration contains a warning message for CONFIG_PEX:
"This requires hardware modification to work correctly if your CPU=20
version < 2.0 and will break the PCI bus. [...]"
=20
I was wondering whether enabling PCIe makes PCI bus functionality=20
unusable at all (including kernel functionality for detecting devices=20
behind a transparent PCI-to-PCI bridge).
=20

IIRC,yes.

Our setup connects a transparent PLX8516 PCI-to-PCI bridge to the PCIe=20
port of the MPC8548 daughter board. Behind that bridge is another PCIe=20
capable device.
MPC8548 is configured to run as PCIe host mode.
=20
When trying to lookup the PCIe devices using lspci I can only see the=20
PPC itself and the bridge.
However I cannot see the device(s) behind the bridge.
=20

That's highly depends on silicon and Arcadia rev. you are using. There are =
some other details=20
about PCI-XP, but to inquire the certain information, you should contact FS=
L support.

Is there another method for detecting PCI(e) devices?
Is "BSP MPC8548CDS 02/24/2006" the latest version corresponding to that=20
hardware?
=20

=46rom what I know, yes, 2/24 is the latest. But you'll need some tricks in o=
rder to utilize PCI-xp...


--=20
Sincerely,=20
Vitaly

Vitaly Bordug schrieb:

From what I know, yes, 2/24 is the latest. But you'll need some tricks in order to utilize PCI-xp...

Thanks for your response. I will contact FSL.
May you share those tricks for PCIe utilization? :)

   Florian