From: David Hinds <dhinds@sonic.net>
To: linux-hotplug@vger.kernel.org
Subject: Re: multiple devices behind a cardbus bridge (adding magma pci extender support)
Date: Fri, 05 Oct 2001 03:55:42 +0000 [thread overview]
Message-ID: <marc-linux-hotplug-100225418226843@msgid-missing> (raw)
In-Reply-To: <marc-linux-hotplug-100215517923775@msgid-missing>
On Thu, Oct 04, 2001 at 10:40:25AM -0700, David Brownell wrote:
> > > What do you mean by "handles the initialization"? A hot plug PCI
> > > controller mainly gives control over power sequencing and isolation of
> > > the PCI devices behind the controller from the rest of the PCI tree,
> > > right? I'd think that this product would have to provide the same
> > > functionality.
> >
> > Yes, you are correct. That's what I was trying to say.
>
> Not all PCI bridges have per-slot power control over devices
> connected to them though, do they?
Certainly.
The PCI-to-PCI bridge in the Magma device may well be an ordinary one
that provides no per-slot power control. However, the fact that it is
sitting behind a cardbus bridge that does provide hot plug power
control, means that as far as the kernel is concerned, this is an
instance of the "general" PCI hot plug configuration problem (more
like Hot Plug PCI or Compact PCI), which is fairly complex from a
resource allocation perspective, as opposed to the "narrow" PCI hot
plug problem that is currently addressed by the simple CardBus
one-PCI-device configuration system.
-- Dave
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prev parent reply other threads:[~2001-10-05 3:55 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-04 0:24 multiple devices behind a cardbus bridge (adding magma pci extender support) Mark Krischer
2001-10-04 1:10 ` multiple devices behind a cardbus bridge (adding magma pci David Brownell
2001-10-04 2:55 ` multiple devices behind a cardbus bridge (adding magma pci extender support) Mark Krischer
2001-10-04 4:18 ` David Hinds
2001-10-04 15:24 ` Greg KH
2001-10-04 15:37 ` David Hinds
2001-10-04 15:45 ` Greg KH
2001-10-04 17:40 ` multiple devices behind a cardbus bridge (adding magma pci David Brownell
2001-10-05 3:55 ` David Hinds [this message]
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