linux-kernel - Re: lanana: Add major/minor entries for PPC QE UART devices

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Message-Id: <46F6BF70-2922-4E05-8DAB-6B0830B0AB47@embeddedalley.com>
Date:	Wed, 28 Feb 2007 12:27:06 -0500
From:	Dan Malek <dan@...eddedalley.com>
To:	Timur Tabi <timur@...escale.com>
Cc:	Segher Boessenkool <segher@...nel.crashing.org>,
	Torben.Mathiasen@...com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ppc-embedded <linuxppc-embedded@...abs.org>
Subject: Re: lanana: Add major/minor entries for PPC QE UART devices


On Feb 28, 2007, at 12:04 PM, Timur Tabi wrote:

> ...  However, ttyCPM0 is currently assigned to 46, and device 50 is  
> an Altix serial card.  The only way to give the CPM 6 or 8 slots  
> without moving it is to overlap the Altix card.

Then, this is currently broken in all cases
and needs to be fixed since the CPM/CPM2
could have up to six UART ports.

> Now I don't know anything about the Altix card, so I don't know if  
> it's possible to use that card on a system with a CPM or a QE.  If  
> it isn't, then I don't know if overlapping minor numbers is still a  
> problem.

I don't think that would be a problem, and I'd like the
CPM/QE to share devices because it makes the
software distributions common to all Freescale
embedded processors.

> If we move CPM/QE to 192, then I can change the CPM device driver  
> to reflect that, but I don't know what that means for older kernels.

That would be bad.  It has nothing to do with the
kernel, but we have finally survived the distribution
updates to ttyCPM, and I don't want to go through
that again just because of QE.

Thanks.

	-- Dan

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