linux-kernel - Re: [patch 2/5] Staging: vme: add VME userspace driver

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Date:	Wed, 12 Aug 2009 13:19:44 +0100
From:	Martyn Welch <martyn.welch@...anuc.com>
To:	"Emilio G. Cota" <cota@...ap.org>
CC:	Greg K-H <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org,
	Sebastien Dugue <sebastien.dugue@...l.net>
Subject: Re: [patch 2/5] Staging: vme: add VME userspace driver

Emilio G. Cota wrote:
> Martyn Welch wrote:
>> However, I also need to consider other cases, such as communications  
>> between multiple SBCs and potentially a few slave devices. I have a need  
>> for this *now*, not in the future. To me, slave support and to a lesser  
>> degree location monitor support is important now, hence why it's  
>> supported in my driver and core. Hence why I am asking, how do you  
>> propose to support these features?
> 
> Point taken.
> 
> Could you tell me a bit more about your needs on this respect?
> So, you have multiple SBCs (some of them as masters, some others
> as slaves) running Linux and want to communicate between them?

Yes - though potentially each card will be both a master and a slave.

> Have you got working code for all that?

In so far as the VME core and tsi-148 driver supports the required functionality, I believe so. We have systems supporting this, though currently with different OSes. We also have a bit of legacy Linux VME code, using the old style of interface. At the moment my priority is less on individual applications and more focused towards ensuring we have a robust API which will support all the features we are likely to require for the chipsets that we have in our products.

We have briefly talked about a "Ethernet over VME" like the "Ethernet over RapidIO" driver, however, this currently isn't top priority.

Martyn

> 
> E.


-- 
Martyn Welch MEng MPhil MIET (Principal Software Engineer)   T:+44(0)127322748
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