linux-kernel - Re: [PATCH] hvc_dcc : add support to armv4 and armv5 core

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Date:	Fri, 31 Aug 2012 11:33:51 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Matthieu CASTET <matthieu.castet@...rot.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"arnd@...db.de" <arnd@...db.de>, "gregkh@...e.de" <gregkh@...e.de>,
	"sboyd@...eaurora.org" <sboyd@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Matthieu CASTET <castet.matthieu@...e.fr>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] hvc_dcc : add support to armv4 and armv5 core

On Fri, Aug 31, 2012 at 12:29:04PM +0200, Matthieu CASTET wrote:
> Alan Cox a écrit :
> > On Fri, 31 Aug 2012 11:21:56 +0200
> > Matthieu CASTET <castet.matthieu@...e.fr> wrote:
> > 
> >> Signed-off-by: Matthieu Castet <matthieu.castet@...rot.com>
> >> ---
> >>  drivers/tty/hvc/hvc_dcc.c |   34 ++++++++++++++++++++++++++++++++++
> >>  1 file changed, 34 insertions(+)
> > 
> > This is a step in the wrong direction. This should all be runtime handled
> > 
> > NAK.
> > 
> 
> AFAIK you can't build a arm kernel that support arm6/armv7 and armv5.
> And I am not sure it will be possible one day.

There are no plans to ever make it possible; there are too many significant
differences between ARMv4, v5 architectures and ARMv6,v7 architectures
to warrant making this runtime selectable.
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