From: Scott Wood <scottwood@freescale•com>
To: Kumar Gala <kumar.gala@freescale•com>
Cc: linuxppc-dev <linuxppc-dev@ozlabs•org>,
Li Li <r64360@freescale•com>, Li Tony <Tony.Li@freescale•com>
Subject: Re: [PATCH] Add MPC837xEMDS PCIE RC mode support
Date: Fri, 30 Nov 2007 09:19:28 -0600 [thread overview]
Message-ID: <20071130151928.GB29484@loki.buserror.net> (raw)
In-Reply-To: <6FF36777-D91C-4B80-968B-CAEF11BC98ED@freescale.com>
On Fri, Nov 30, 2007 at 08:57:33AM -0600, Kumar Gala wrote:
> On Nov 30, 2007, at 3:37 AM, Li Li wrote:
> > If do it standard, a 256M config space, at least 256M mem space and
> > 16M
> > io space are needed for each PCIE controller.
> > To allocate PCIE window, the window size only can be 512M or 1G.
> > If we choose 1G space, two PCIE controller needs 2G space.
> > We do not have 2G free physical space now. Usually, we use upper 128M
> > configure space. So, we have to cut down the config space.
That decision should be made in the kernel, not the dts.
> Is it possible to make the outbound window for cfg space 4k and change
> the region of config space its looking at?
Yes, that'd be best.
> > Here is a little complex. The MPC837xE board needs a carrier board to
> > extend PCIE slot. If user does not populate carrier board onto MPC837xE
> > board and do PCIE scan, the system will halt. I just want to provide a
> > easy way to disable the PCIe other than modify and recompile the dts.
>
> So I have to recompile the kernel for this case, that seems even more
> painful to the user. Can we not detect if this board isn't there and
> not hang?
Assuming it's similar to PCI on other 83xxMDS, yes -- there's a bit in the
reset control words that can be checked.
We don't currently do it on any 83xx that I'm aware of, though. :-P
-Scott
next prev parent reply other threads:[~2007-11-30 15:19 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-30 3:45 [PATCH] Add MPC837xEMDS PCIE RC mode support Li Li
2007-11-30 4:14 ` Olof Johansson
2007-11-30 5:33 ` Li Li
2007-11-30 15:12 ` Scott Wood
2007-11-30 7:37 ` Kumar Gala
2007-11-30 8:48 ` Li Li
2007-11-30 9:05 ` Kumar Gala
2007-11-30 9:37 ` Li Li
2007-11-30 14:57 ` Kumar Gala
2007-11-30 15:19 ` Scott Wood [this message]
2007-12-03 3:43 ` Li Li
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