linux-kernel - Re: [PATCH 01/18] Altera FPGA firmware download module.

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Message-ID: <4D1DBE2A.5080003@infradead.org>
Date:	Fri, 31 Dec 2010 09:27:38 -0200
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:	"Igor M. Liplianin" <liplianin@...by>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, aospan@...up.ru
Subject: Re: [PATCH 01/18] Altera FPGA firmware download module.

Em 31-12-2010 09:12, Laurent Pinchart escreveu:
> Hi Igor,
> 
> On Friday 31 December 2010 06:26:31 Igor M. Liplianin wrote:
>> It uses STAPL files and programs Altera FPGA through JTAG.
>> Interface to JTAG must be provided from main device module,
>> for example through cx23885 GPIO.
> 
> It might be a bit late for this comment (sorry for not having noticed the 
> patch set earlier), but...
> 
> Do we really need a complete JTAG implementation in the kernel ? Wouldn't it 
> better to handle this in userspace with a tiny kernel driver to access the 
> JTAG signals ?
> 
Laurent,

Igor already explained it. From what I understood, the device he is 
working has a firmware that needs to be loaded via JTAG/FPGA.

Actually, I liked the idea, as the FPGA programming driver could be
useful if other drivers have similar usecases.

Cheers,
Mauro
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