ppc4xx_find_bridges( ) hangs kernel on Xilinx ML300 (PCI)]

Mike Wellington wellington at lucent.com
Tue Apr 20 06:55:03 EST 2004

PCI problem solved!

-------- Original Message --------
Subject: Re: ppc4xx_find_bridges( ) hangs kernel on Xilinx ML300  (PCI)
Date: Mon, 19 Apr 2004 13:48:02 -0700
From: Peter Ryser <Peter.Ryser at xilinx.com>
Organization: Xilinx, Inc.
To: Mike Wellington <wellington at lucent.com>
CC: linuxppc-embedded at lists.linuxppc.org
References: <1b6001c417f6$229c2a70$3cc8a8c0 at epro.dom>
<40842D14.9040708 at lucent.com>

The PCI support that is currently included in the Linux kernel tree is
for the V2PDK based OPB -> PCI bridge. It will not work with the EDK
based OPB -> PCI bridge, i.e. you will find exactly what you see.

Please download the EDK reference design for ML300 from
http://www.xilinx.com/ise/embedded/edk_examples.htm (design #6). The
design contains the V2PDK based bridge (including the pcore therefor)
and, thus, the Linux kernel will work fine with that design.

We are currently working on moving to the EDK based bridge and the Linux
kernel tree will be patched once this work is completed.

- Peter

Mike Wellington wrote:

> Hi-
>   I am trying to port the Xilinx PCI code to
> an embedded linux kernel.  The code calls
> ppc4xx_find_bridges( ) during the kernel initialization
> and hangs the kernel.
>   I built the GPL 2.4 kernel from the Open Source
> archives and it hangs also.
>   Then I copied ppc405_pci.c from the GPL source
> to my kernel tree and copied  head_4xx.S from the
> GPL source to my kernel tree and it still
> hangs.
>   I'm starting to wonder if there is something
> wrong with the PCI support for the Xilinx OCP PCI
> core.
>   Does anybody have a working PCI device on a
> Xilinx Virtex-II Pro using the Xilinx-supplied
> PCI core?
> -mike wellington
>  wellington at lucent.com
>  anyplatform at bithead.com

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