linux-kernel - Re: [PATCH] drivers: char: hvc: add arm JTAG DCC console support

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Message-ID: <BANLkTinTWwLB0gi0qKQfCYQ8x6PTuL9-uA@mail.gmail.com>
Date:	Thu, 7 Apr 2011 14:57:51 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	RONETIX - Asen Dimov <dimov@...etix.at>
Cc:	Daniel Walker <dwalker@...eaurora.org>,
	linux-kernel@...r.kernel.org,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Arnd Bergmann <arnd@...db.de>,
	Nicolas Pitre <nico@...xnic.net>,
	Tony Lindgren <tony@...mide.com>,
	linux-arm-msm@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linuxppc-dev@...ts.ozlabs.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] drivers: char: hvc: add arm JTAG DCC console support

On Thu, Apr 7, 2011 at 14:39, RONETIX - Asen Dimov wrote:
> On 11/30/2010 09:25 PM, Daniel Walker wrote:
>> This driver adds a basic console that uses the arm JTAG
>> DCC to transfer data back and forth. It has support for
>> ARMv6 and ARMv7.
>>
>> This console is created under the HVC driver, and should be named
>> /dev/hvcX (or /dev/hvc0 for example).
>>
>>  drivers/char/Kconfig   |    9 +++
>>  drivers/char/Makefile  |    1 +
>>  drivers/char/hvc_dcc.c |  133
>> ++++++++++++++++++++++++++++++++++++++++++++++++
>
> ...
>
> this DCC driver implements "one channel", but what about implementing
> "multiple channels". For example reserve few(3) bits for channel number,
> and two bits for carried data, then fill the rest bytes with with some data
> and send the word(32 bits) over DCC. On the Linux side writing on /dev/hvcX
> puts the number X as channel number, and on the other side the CPU
> emulator gets the data and redistribute it to TCP/IP socket.
>
> I have started write some code implementing this. Are there any one
> interested
> in this multiple channels, and are there any one started to work on it?

this sort of multiplexing of the data stream sounds like the job for
userspace ?  or maybe a line discipline ?  inserting structured data
into the kernel driver doesnt sound right to me ...
-mike
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