linux-kernel - Re: [PATCHv2 2/2] ARM: debug: Move DEBUG_ICEDCC into the DEBUG

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Message-ID: <20110929094243.GC25061@e102144-lin.cambridge.arm.com>
Date:	Thu, 29 Sep 2011 10:42:43 +0100
From:	Will Deacon <will.deacon@....com>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Brown <davidb@...eaurora.org>
Subject: Re: [PATCHv2 2/2] ARM: debug: Move DEBUG_ICEDCC into the DEBUG_LL
 choice

On Thu, Sep 29, 2011 at 10:21:02AM +0100, Will Deacon wrote:
> On Thu, Sep 29, 2011 at 03:05:16AM +0100, Stephen Boyd wrote:
> > Chatting with David Brown made me realize that this patch now forces
> > ICEDCC for anybody who selects DEBUG_LL and hasn't moved to adding a
> > Kconfig in the choice menu. I'm not sure if that actually matters since
> > it may be incentive to put your machine of choice into this menu.
> > 
> > Otherwise, we may want to drop this until a later point, or just leave
> > it out of the choice menu altogether.
> 
> Given that the ICEDCC stuff shouldn't cause any other problems by having it
> enabled (that is, your kernel should still boot) then we should be alright
> leaving this as-is while platforms move over to the new scheme.

Bah, just took this for a spin on my Realview-PBX (Cortex-A9) platform and
the board won't boot unless I have a hardware debugger enabled that can
service the comms channel. This contradicts the Kconfig text which says:

	  It does include a timeout to ensure that the system does not
	  totally freeze when there is nothing connected to read.

so we certainly need to fix something!

Will
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