linux-kernel - RE: [PATCH v18 4/5] dt-bindings: remoteproc: Add documentation for ZynqMP R5 rproc bindings

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Date:   Thu, 8 Oct 2020 13:22:09 -0700 (PDT)
From:   Stefano Stabellini <stefano.stabellini@...inx.com>
To:     Ben Levinsky <BLEVINSK@...inx.com>, linus.walleij@...aro.org
cc:     Catalin Marinas <catalin.marinas@....com>,
        Stefano Stabellini <stefanos@...inx.com>,
        "Ed T. Mooring" <emooring@...inx.com>,
        "sunnyliangjy@...il.com" <sunnyliangjy@...il.com>,
        Punit Agrawal <punit1.agrawal@...hiba.co.jp>,
        Michal Simek <michals@...inx.com>,
        "michael.auchter@...com" <michael.auchter@...com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v18 4/5] dt-bindings: remoteproc: Add documentation for
 ZynqMP R5 rproc bindings

On Thu, 8 Oct 2020, Ben Levinsky wrote:
> > Does it mean that the main CPU see the memory of the
> > R5 as "some kind of TCM" and that TCM is physically
> > mapped at 0xffe00000 (ITCM) and 0xffe20000 (DTCM)?
> > 
> > If the first is ITCM and the second DTCM that is pretty
> > important to point out, since this reflects the harvard
> > architecture properties of these two memory areas.

Hi Linus,

I don't think Xilinx TCMs are split in ITCM and DTCM in the way you
describe here: https://www.kernel.org/doc/Documentation/arm/tcm.txt.
Either TCM could be used for anything. See
https://www.xilinx.com/support/documentation/user_guides/ug1085-zynq-ultrascale-trm.pdf
at page 82.