Re: [PATCH 2/3] fpga bus driver

[Pantelis Antoniou]

Hi Alan,

On Aug 2, 2014, at 1:28 AM, <atull@xxxxxxxxxxxxxxxxxxxxx> wrote:

> From: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx>
> 
> This driver allows programming the fpga from
> device tree overlays.
> 
> This code is dependent on Pantelis Antoniou's current
> work on Device Tree overlays, a method of dynamically
> altering the kerel's live Device Tree.  This patchset
> was tested with Pantelis's and Grant Likely's stuff
> that is in git plus some dtc fixups for compiling
> overlays.
> 
> Resume is handled by re-requesting the firmware and
> reprogramming the FPGA.
> 
> Here's a simple example. Start with:
>  * the altera-gpio driver built in to the kernel but not in the
>    device tree.
>  * raw fpga image at /lib/firmware/soc_system.rbf
>  * Load appropriate device tree overlay in configfs by doing
>    $ mkdir /config/device-tree/overlays/1
>    $ echo socfpga_overlay.dtbo > /config/device-tree/overlays/1/path

FWIW, there's now an updated configfs interface. You can just 
# cp socfpga_overlay.dtbo /config/device-tree/overlays/1/dtbo

That's namespace safe, if you care about those things.

Regards

-- Pantelis

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