[meta-xilinx] Loading FPGA bit streams

[SMITH Peter T]

All, thanks for the clarification. I now understand the position with respect to user space FPGA configuration. I too would be interested in understanding about DT overlays. Peter

-----Original Message-----
From: meta-xilinx-bounces at yoctoproject.org [mailto:meta-xilinx-bounces at yoctoproject.org] On Behalf Of Mike Looijmans
Sent: 09 June 2015 14:41
To: meta-xilinx at yoctoproject.org
Subject: Re: [meta-xilinx] Loading FPGA bit streams

On 09-06-15 15:28, Nathan Rossi wrote:
> On Mon, Jun 8, 2015 at 6:56 PM, SMITH Peter T <peter.t.smith at alstom.com> wrote:
>> Stephen,
>>
>> I thought that the xdevcfg driver was not part of the meta-xilinx
>> Yocto build and that the community was working towards a generic
>> fpga_manager (or something like that) solution.
>
> The 'xdevcfg' driver is only found in the linux-xlnx kernel. Currently
> in meta-xilinx the linux-xlnx kernel is used by default for the Zynq
> machines, this default is infact due in part to the fpga_manger and or
> any driver not being available in mainline/yocto kernels yet.
>
> Also to add to Mike's comment about delayed loading/probing, device
> tree overlays might be useful as well (especially for
> re-configuration).

At the risk of hijacking this topic, I looked at overlays, since they're available on the current 3.19 kernel, but apparently it's an in-kernel thing and there appears to be no way to "inject" a device-tree overlay fragment from userspace. (The only way to actually use DT overlays appears to be buying a
beagle-board...)

Since you appear to be one of the few people who actually know what device-tree overlays are (I found out about them at the ELCE last year), do you happen to have any hands-on experience?

It'd be great to be able to pair a bitstream and a DT overlay...


Kind regards,

Mike Looijmans
System Expert

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