From: Greg KH <greg@kroah.com>
To: linux-hotplug@vger.kernel.org
Subject: Re: Fakephp to hotplug FPGAs
Date: Thu, 09 Dec 2004 23:45:40 +0000 [thread overview]
Message-ID: <20041209234540.GB7523@kroah.com> (raw)
In-Reply-To: <E8F8DBCB0468204E856114A2CD20741F390D43@mail.local.ActualitySystems.com>
On Wed, Dec 08, 2004 at 04:25:16PM -0500, Jay Miller wrote:
> Hi All,
>
> I was hoping that someone could help me out of a hotplugging nightmare?
>
> We're running Linux 2.6.6 on and embedded system with FPGAs on the other
> side of a PCI-X bridge. The FPGAs are programmed after boot and I have
> tried to use fakephp to discover the newly programmed device without
> rebooting.
>
> This works in the sense that lspci reports a new device, but it doesn't
> assign any resources for the device. My assumption is that the bridge
> doesn't have any resources to give because no device was detected on the
> first bus scan.
That is true. You are going to have to figure out how to reserve a
resource range at boot time. Hardware that supports PCI hotplug
controllers reserve this in their BIOS (or firmware in the case of PPC64
hardware).
It looks like you need to adapt the compact pci hotplug driver to do
this. There were patches for the 2.4 kernel to accept ranges of
resources at boot time to ignore, and later on those ranges were
availble for the compact pci controller to dole out to any devices
attaching through it. Scan the linux pci hotplug mailing list archives
for these patches.
Good luck,
greg k-h
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prev parent reply other threads:[~2004-12-09 23:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-08 21:25 Fakephp to hotplug FPGAs Jay Miller
2004-12-09 23:45 ` Greg KH [this message]
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