RE: [Q] cPCI hotplugging

["Zink, Dan" <Dan.Zink@COMPAQ.com>]

To answer Miles' question, I am aware of the /sbin/hotplug stuff that was
added but hadn't given it a whirl yet.  It ought to tie in nicely.  We
did most of our development prior to the appearance of /sbin/hotplug so
we have another usermode notification method for synchronization with
the PCI Hot Plug GUI we've written.  In addition, our GUI uses the kudzu
database to find drivers and allow the user to load them.  That should
be unnecessary if /sbin/hotplug does the right thing.

As for the rest of the "infrastructure" work we've done, some of it is
support that could be applied to any PCI hot plug driver.  Some could
be applied to the kernel's PCI configuration routines.

Dan

-----Original Message-----
From: Matthew Dharm [mailto:mdharm-usb@one-eyed-alien.net]
Sent: Tuesday, January 16, 2001 3:19 PM
To: Miles Lane
Cc: Zink, Dan; 'Scott Laird'; David Brownell; Eric;
linux-hotplug-devel@lists.sourceforge.net
Subject: Re: [Q] cPCI hotplugging


Umm... I just want to make sure we're all on the same page, because Miles'
e-mail sounds like he _might_ be confused.

cPCI != Compaq PCI

cPCI = Compact PCI, which is a hot-swappable bus archetecture (and cabinet
design, and card form factors, and...)

cPCI has no controller.  It's not a controller spec.  It's a bus and
physical spec.  Tho the Compaq PCI controller may give you many of the same
benefits as a real cPCI system.

cPCI is really just PCI, at 33/66MHz and 32/64 bits wide.  It supports
insertion notification, and removal request (open the latches, allow the
software to shutdown and turn off the LED, then remove the board).

Taking the 2 second look at the web page, it looks like they're working on
both infrastructure for PCI Hot Plug, as well as a driver for the Compaq
controller for this thing.  I don't know much about this controler, but I'm
certainly interested in the infrastructure parts.

Matt

On Tue, Jan 16, 2001 at 10:54:45AM -0800, Miles Lane wrote:
> Zink, Dan wrote:
> 
> > Funny you should ask...  We have developed a driver for the Compaq PCI
> > Hot Plug Controller that we will be releasing in the next week or two.
> > 
> > Our SourceForge site is at:
> > http://opensource.compaq.com/sourceforge/project/?group_id\x13
> > 
> > I'll be posting a notice to this list when we get the source up there.
> 
> So, Dan,
> 
> In Scott's initial note on the topic, he mentioned that cPCI is a
> hotplugging bus.  You may or may not have heard about the recent
> hotplug developments in the 2.4.0 series kernel.  If you already
> know about it, do you have any idea how your new driver will
> mesh, if at all, with the new hotplug infrastructure?
> 
> 	Miles

-- 
Matthew Dharm                              Home:
mdharm-usb@one-eyed-alien.net 
Maintainer, Linux USB Mass Storage Driver

What, are you one of those Microsoft-bashing Linux freaks?
					-- Customer to Greg
User Friendly, 2/10/1999

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