linux-kernel - Re: [PATCH] serial: DCC(JTAG) serial and console emulation support

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Message-ID: <1286480364.23836.17.camel@c-dwalke-linux.qualcomm.com>
Date:	Thu, 07 Oct 2010 12:39:24 -0700
From:	Daniel Walker <dwalker@...eaurora.org>
To:	Mike Frysinger <vapier@...too.org>
Cc:	linux-kernel@...r.kernel.org,
	"Hyok S. Choi" <hyok.choi@...sung.com>,
	Tony Lindgren <tony@...mide.com>,
	Jeff Ohlstein <johlstei@...cinc.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Ben Dooks <ben-linux@...ff.org>,
	Alan Cox <alan@...ux.intel.com>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Feng Tang <feng.tang@...el.com>,
	Tobias Klauser <tklauser@...tanz.ch>,
	Jason Wessel <jason.wessel@...driver.com>,
	Philippe Langlais <philippe.langlais@...ricsson.com>
Subject: Re: [PATCH] serial: DCC(JTAG) serial and console emulation support

On Thu, 2010-10-07 at 15:25 -0400, Mike Frysinger wrote:
> On Thu, Oct 7, 2010 at 14:36, Daniel Walker wrote:
> > Many of JTAG debuggers for ARM support DCC protocol over JTAG
> > connection, which is very useful to debug hardwares which has no
> > serial port. This patch adds DCC serial emulation and the console
> > support. System timer based polling method is used for the
> > emulation of serial input interrupt handling.
> 
> why use serial_core at all ?  seems like you could just use the tty
> layer directly.  i did that with drivers/char/bfin_jtag_comm.c.
> 
> although, there's the suggestion in the air that my jtag driver could
> be converted to the HVC framework to even further simplify things.
> but no one thinks it should be serial_core :).
> -mike

It will actually create a serial port on ttyS* if you want it to.. It
could be debatable if that's useful, but I didn't rip that out because
Hyok had that in his original code (he thought it was useful) ..

Daniel

-- 

Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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