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

Hi, 

-----Original Message-----
From: 
linuxppc-embedded-bounces+wei.zhang=freescale.com@ozlabs.org 
[mailto:linuxppc-embedded-bounces+wei.zhang=freescale.com@ozla
bs.org] On Behalf Of Florian Boelstler
Sent: Monday, July 03, 2006 2:38 PM
To: linuxppc-embedded@ozlabs.org
Subject: Re: MPC8548 PCIe / PCI support with BSP MPC8548CDS 02/24/2006

Hi,

Zhang Wei-r63237 schrieb:

quoted

Yes, I think so. You can plug a PCIe ethernet card to test it. 

A single device always works.

quoted

:-), Maybe it's need more study. Could you enable the DEBUG 

and post the kernel verbose message?

We added lots of debug output and made some modifications 
(mostly delays between calls to early_read_config_dword() and
early_write_config_dword() in pci_auto.c) and came to the 
conclusion that generic bridge devices (PCIe-to-PCI), even in 
a cascaded setup of three bridges, work fine.

Yea, that's a good news.

However a PCIe switch (PLX8516/8532) doesn't work. The 
MPC8548 only detects a single device (i.e. primary side of 
the switch).
We are going to analyze the problem more deeply soon. It 
seems that the configuration space of that devices isn't 
properly set up.

Just a suggestion.
Do you see below codes in mpc85xx_pex_errata.c(in read and write functions)?
	if (devfn != 0x0) 
		return PCIBIOS_DEVICE_NOT_FOUND;
Change them to:
	if (devfn != 0x0 && bus->number ==0) 
		return PCIBIOS_DEVICE_NOT_FOUND;
And try again. :-)
(If you apply my patch, please use "if (devfn != 0x0 && bus->number ==0xff)" )

The provided patch doesn't make any difference, besides that 
it is moved to a location where the PPC itself is not detected.

This patch fix an issue of MPC8641 PCI-Ex controller. It seems MPC8548 has no that issue. Well then fotget it.

Thanks!
Zhang Wei

Please keep us informed if there is any progress besides 
Freescale, as I will do.

Cheers,

   Florian

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