linux-kernel - Re: [PATCH v8 2/4] fpga manager: add sysfs interface document

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Message-ID: <20150109205643.GA5761@amd>
Date:	Fri, 9 Jan 2015 21:56:44 +0100
From:	Pavel Machek <pavel@...x.de>
To:	atull <atull@...nsource.altera.com>
Cc:	gregkh@...uxfoundation.org, jgunthorpe@...idianresearch.com,
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Subject: Re: [PATCH v8 2/4] fpga manager: add sysfs interface document

On Fri 2015-01-09 13:14:24, atull wrote:
> On Wed, 7 Jan 2015, Pavel Machek wrote:
> 
> > On Tue 2015-01-06 14:13:37, atull@...nsource.altera.com wrote:
> > > +
> > > +What:		/sys/class/fpga_manager/<fpga>/firmware
> > > +Date:		October 2014
> > > +KernelVersion:	3.18
> > > +Contact:	Alan Tull <atull@...nsource.altera.com>
> > > +Description:	Name of the FPGA image file to load using firmware
> > > class.
> > 
> > This one is ugly: it unneccessarily passes firmware name through the
> > kernel. Just make interface and code simpler by always passing
> > "socfpga-fpga-image" or something like that.
> > 
> > Thanks,
> > 									Pavel
> 
> Hi Pavel,
> 
> It might be ugly.  It's not unnecessary.  Some uses of FPGAs involve
> switching out the FPGA images dynamically under control of the userspace.

Then configure udev to load right firmware for you, or ln -s
image-i-want-now socfpga-fpga-image to select the one to read...?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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