On Tue, 1 Sep 2020, François Ozog via System-dt wrote:
> On Tue, 1 Sep 2020 at 14:49, Tomas Evensen <[email protected]> wrote:
> Here are some brief notes from the meeting.
>
> If nothing else as a showcase on how much we miss Nathalie when she is
> on vacation 😉
>
> Krzysztof Kepa – GE
> Mathieu Poirier – Linaro
> Etsam Anjum – Mentor
> Anrnoud Pouliquen – ST
> Loic Pallardy - ST
> Suman Anna - TI
> Dan Milea – Wind River
> Mark Dapoz – Wind River
> Tomas Evensen – Xilinx
> Stefano Stabellini – Xilinx
> Bruce Ashfield – Xilinx
> Ed Mooring – Xilinx
> Ben Levinsky - Xilinx
>
> Stefano went through slides.
> Overall idea:
>
> 1. Specify remoteproc channels with minimal information in System-DT
> in a way that is as common as possible for all vendors.
> In particular, we are avoiding to have to specify the same memory
> regions in more than one place. A resource group is specially
> marked to contain most information.
> 2. Use Lopper to create the vendor specific remoteproc specification
> Generating reserved-memory, etc. information that has duplicate
> information.
> For the time being, no plans to unify the vendor specific information
> that goes into the traditional device tree for Linux
> 3. Later (or in parallel), but without making it a gating item,
> start discussions on what we can do to unify the vendor
> specific information in the traditional DT
>
> Discussion about how TI and ST might generate their specific
> information from this specification.
>
> Stefano to send out examples and slides.
> Ben: Xilinx backend to Lopper is upstreamed and available as an
> example. Might change as upstreaming continues.
>
> Question:
> * How do we configure VirtIO?
>
> Could you describe more the VirtIO question so that relationship with Linaro
> project Stratos is assessed?
I think this point refers to various vdev<x> buffers described under
/reserved-memory which are linked from RemoteProc. From the Xilinx
bindings:
reserved-memory {
#address-cells = <1>;
#size-cells = <1>;
ranges;
rpu0vdev0vring0: rpu0vdev0vring0@3ed40000 {
compatible = "xilinx,openamp-ipc-1.0";
no-map;
reg = <0x3ed40000 0x4000>;
};
rpu0vdev0vring1: rpu0vdev0vring1@3ed44000 {
compatible = "xilinx,openamp-ipc-1.0";
no-map;
reg = <0x3ed44000 0x4000>;
};
rpu0vdev0buffer: rpu0vdev0buffer@3ed48000 {
compatible = "xilinx,openamp-ipc-1.0";
no-map;
reg = <0x3ed48000 0x100000>;
};
rproc_0_reserved: rproc@3ed000000 {
compatible = "xilinx,openamp-ipc-1.0";
no-map;
reg = <0x3ed00000 0x40000>;
};
};
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