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

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Message-ID: <20110929180428.GA8125@huya.qualcomm.com>
Date:	Thu, 29 Sep 2011 11:04:28 -0700
From:	David Brown <davidb@...eaurora.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Will Deacon <will.deacon@....com>,
	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 10:22:42AM -0700, Stephen Boyd wrote:
> >> One of the problems you'll encounter is that there's places where we
> >> don't have any timer infrastructure (eg, decompressor) and software
> >> timing loops won't work (they'll be too slow for the lower-end CPUs
> >> and too fast for the upper-end CPUs.)
> > Agreed, software timing loops are the only option and it's impossible to get
> > them right everywhere. I think the Kconfig help text should be updated so
> > that the timeout paragraph is removed.
> 
> Yes if you wait a long time the timeout for each character will expire
> and the execution will continue.

Wouldn't it be better to detect the first timeout and then stop trying
to write to the DCC?

But, do we really want fancy auto-detection stuff in DEBUG_LL?  A
timeout might make sense for a DCC console, but not here.

David

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