Re: Unifying cape overlays into boot .dtb for BeagleBoard.org boards
From: Jason Kridner <hidden>
Date: 2014-06-17 16:33:01
Also in:
linux-arm-kernel, linux-omap
On Tue, Jun 17, 2014 at 12:01 PM, Russell King - ARM Linux [off-list ref] wrote:
On Tue, Jun 17, 2014 at 04:32:11PM +0300, Pantelis Antoniou wrote:quoted
The complexity is absolutely required, and it has nothing to do with beaglebone capes. The fact of the matter is that reconfigurable hardware is here, on shipping system, and we, as the linux kernel community have to make sure it works, and that it works in a sane way.Right, so looking back in the git history, this project has been going on for... at least four years? Probably longer than the length of time that we've been converting ARM to DT. At no point during that has anyone brought up the issue of DT being dynamic, so none of the drivers which we have been converting caters for this. Isn't this a bit of a missed opportunity, if this is a direction that OF wishes to head towards?
I believe it absolutely is a missed opportunity, but that doesn't mean it isn't still needed moving forward. We've been using overlays successfully in the BeagleBoard.org community on BeagleBone Black for over a year now. It is just a shame we're still shipping a 3.8 kernel. This universal overlay provides hope to support most add-ons, but it doesn't address the dynamic nature of some add-on hardware. It is certainly my hope that this effort doesn't derail the overlay development work.
Wouldn't it have been relevant to the discussion at kernel summit too, concerning DRM/v4l2/componentised systems? What if someone comes along tomorrow with part of their multimedia based system inside a FPGA which they program up at runtime? -- FTTC broadband for 0.8mile line: now at 9.7Mbps down 460kbps up... slowly improving, and getting towards what was expected from it.
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