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

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

Hi,
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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).
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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. [...]"
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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).
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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.
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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.
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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?
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=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