linux-kernel - Re: [PATCH] arm64: Add support for cisco craw64 ARMv8 SoCs

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Message-ID: <CAK8P3a2ANBD5q-J+Mr0up+wFBdWJG3Z2ceUP=aB29G7WMq1Z3Q@mail.gmail.com>
Date:   Wed, 31 Mar 2021 22:18:22 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Daniel Walker <danielwa@...co.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Olof Johansson <olof@...om.net>,
        SoC Team <soc@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Ofer Licht <olicht@...co.com>, xe-linux-external@...co.com,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64: Add support for cisco craw64 ARMv8 SoCs

On Wed, Mar 31, 2021 at 7:57 PM Daniel Walker <danielwa@...co.com> wrote:
>
> On Wed, Mar 31, 2021 at 09:04:15AM +0200, Arnd Bergmann wrote:
> > On Wed, Mar 31, 2021 at 3:46 AM Daniel Walker <danielwa@...co.com> wrote:
> > > From: Ofer Licht <olicht@...co.com>
> >
> > Thanks for the submission, it's always nice to see a new platform
>
>
> > > Define craw64 config, dts and Makefile for Cisco
> > > SoCs known as Craw.
> >
> > I'd like some more information about the platform, e.g. the target
> > market and maybe a link to the product information.
>
> Our SoC is produced as an internal product. So SoC specifications aren't
> widely available.
>
> Here is an example of a Cisco product which uses this SoC,
>
> https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9200-series-switches/nb-06-cat9200-ser-data-sheet-cte-en.html
>
> I suspect that's not really what your looking for tho.

No, that's pretty much exactly what I was looking for. Just put this one
sentence and the link into the patch description and it will be fine.

> >
> > The memory size is usually filled by the boot loader, just put an
> > empty node into the .dtsi file
>
> Arnd, I must regretfully inform you that Cisco has a deep dark addiction to
> bootloaders which, are, um, how do I say this diplomatically, um , brain dead.
>
> You have some other comments below related to moving things into the bootloader,
> and I can look into it, but bootloader inflexibility is wide spread inside
> Cisco.

Ok, no worries. If the bootloader can do it right, you should do it, but
this part is not essential.

        Arnd