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Date: Tue, 8 Oct 2013 11:49:46 -0500 From: Alan Tull <atull@...era.com> To: Michal Simek <monstr@...str.eu> CC: "H. Peter Anvin" <hpa@...or.com>, Jason Gunthorpe <jgunthorpe@...idianresearch.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Pavel Machek <pavel@...x.de>, Michal Simek <michal.simek@...inx.com>, <linux-kernel@...r.kernel.org>, 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 Tue, 2013-10-08 at 15:00 +0200, Michal Simek wrote: > On 10/07/2013 05:07 PM, H. Peter Anvin wrote: > > Special soft IP presenting a PCI device to the host. > > ok. It means that you should need just different backend for this device > which is able to communicate over PCI. > > I still can't see why this case should be problematic for this fpga > manager. > As Jason pointed if this is just about JTAG emulation and your > data is in different format then you have to create your backend > which will support this configuration. > I will want to look at gpio jtag emulation to be able to program > different board. We have this support for u-boot and doing in Linux > should be also possible. > > I think the question is if we can live with 2/3 user interfaces. > I tend to keep firmware one because it is covering a lot of common > use cases and it can be easily to use. > And then I don't have any preference if sysfs or char device The sysfs and char device interface are equal, except I don't think it is right to write binary data to a sysfs attribute. The difference between these 3 options is that firmware will work for some fixed use cases, but either the sysfs or char interface will work for all the use cases. Alan > is better. > > Thanks, > Michal > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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