Date: Tue, 17 Feb 2015 20:17:27 +0100
From: Pavel Machek <pavel@denx.de>
To: Rob Landley <rob@landley.net>
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
        Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
        One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
        atull <atull@opensource.altera.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>, hpa@zytor.com,
        Michal Simek <monstr@monstr.eu>,
        Michal Simek <michal.simek@xilinx.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        devicetree@vger.kernel.org, robh+dt@kernel.org,
        Grant Likely <grant.likely@linaro.org>, iws@ovro.caltech.edu,
        linux-doc@vger.kernel.org, Mark Brown <broonie@kernel.org>,
        philip@balister.org, rubini@gnudd.com,
        Steffen Trumtrar <s.trumtrar@pengutronix.de>, jason@lakedaemon.net,
        kyle.teske@ni.com, nico@linaro.org, Felipe Balbi <balbi@ti.com>,
        m.chehab@samsung.com, davidb@codeaurora.org, davem@davemloft.net,
        cesarb@cesarb.net, sameo@linux.intel.com,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Walleij <linus.walleij@linaro.org>, pawel.moll@arm.com,
        mark.rutland@arm.com, ijc+devicetree@hellion.org.uk,
        galak@codeaurora.org, devel@driverdev.osuosl.org,
        Alan Tull <delicious.quinoa@gmail.com>, dinguyen@opensource.altera.com,
        yvanderv@opensource.altera.com
Subject: Re: [PATCH v8 2/4] fpga manager: add sysfs interface document
Message-ID: <20150217191727.GA18429@amd>
References: <20150113222450.GA17475@obsidianresearch.com>
 <alpine.DEB.2.02.1501150936390.16760@linuxheads99>
 <20150115184726.GA23247@obsidianresearch.com>
 <20150115204502.591bca1d@lxorguk.ukuu.org.uk>
 <A3B5BC9B-EB88-4C0E-B235-E9C86D23DC34@konsulko.com>
 <20150121160151.453ba403@lxorguk.ukuu.org.uk>
 <D466D9FF-25DA-4765-9469-128733BEBC4D@konsulko.com>
 <20150121202700.GB4942@obsidianresearch.com>
 <20150215224006.GA5626@amd>
 <54E37569.80508@landley.net>
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On Tue 2015-02-17 11:07:53, Rob Landley wrote:
> 
> 
> On 02/15/2015 04:40 PM, Pavel Machek wrote:
> > On Wed 2015-01-21 13:27:00, Jason Gunthorpe wrote:
> >> On Wed, Jan 21, 2015 at 06:33:12PM +0200, Pantelis Antoniou wrote:
> >> My point is that the current firmware layer is overly cautious and
> >> FPGAs are very big. My current project on small Xilinx device has a
> >> 10MB programming file. The biggest Xilinx device today has a max
> >> bitfile size around 122MB.
> >>
> >> So keeping that much memory pinned in the kernel when I can prove it
> >> is uncessary for my system (either because there is no suspend/resume
> >> possibility, or because I know the CPU can always access the
> >> filesytem) is very undesirable.
> > 
> > Well, your current device aalso has 1GB RAM, no?
> 
> Unnecessarily pinning 10% of your ram is a good solution?

Never said that. But I'd rather have _some_ API proposed, then try to
design in everthing including kitchen sink and do nothing.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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