linux-kernel - Re: [RFC PATCH v2 0/1] FPGA subsystem core

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Message-ID: <20131005051056.GA7698@obsidianresearch.com>
Date:	Fri, 4 Oct 2013 23:10:56 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, monstr@...str.eu,
	Pavel Machek <pavel@...x.de>,
	Michal Simek <michal.simek@...inx.com>,
	linux-kernel@...r.kernel.org, Alan Tull <atull@...era.com>,
	Dinh Nguyen <dinguyen@...era.com>,
	Philip Balister <philip@...ister.org>,
	Alessandro Rubini <rubini@...dd.com>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Yves Vandervennet <rocket.yvanderv@...il.com>,
	Kyle Teske <kyle.teske@...com>,
	Josh Cartwright <joshc@....teric.us>,
	Nicolas Pitre <nico@...aro.org>,
	Mark Langsdorf <mark.langsdorf@...xeda.com>,
	Felipe Balbi <balbi@...com>, linux-doc@...r.kernel.org,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	David Brown <davidb@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	"David S. Miller" <davem@...emloft.net>,
	Joe Perches <joe@...ches.com>,
	Cesar Eduardo Barros <cesarb@...arb.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH v2 0/1] FPGA subsystem core

On Fri, Oct 04, 2013 at 09:00:28PM -0700, H. Peter Anvin wrote:

> Every FPGA toolchain I know of has a way to emit JAM/STAPL bytecode
> files... and a fair number of programming scenarios need them.

Yes, but now you are talking about JTAG.

JTAG is a very different problem than configuring over the
configuration bus, I don't think it makes much sense to try and
combine those two things into a single subsystem.

The majority use of JAM/STAPL output is for manufacturing
automation. In system, In field programming of SRAM FPGAs via JTAG is
uncommon.

Jason
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