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From:   Arnd Bergmann <arnd@kernel.org>
Date:   Mon, 11 Jan 2021 09:59:23 +0100
Message-ID: <CAK8P3a3TNVj_Gw=GaEFELdF9Fo25XU_PFWS5N0+kb=R394KNVQ@mail.gmail.com>
Subject: Re: Old platforms: bring out your dead
To:     Geert Uytterhoeven <geert@linux-m68k.org>
Cc:     Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Krzysztof Adamski <krzysztof.adamski@nokia.com>,
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        Baruch Siach <baruch@tkos.co.il>,
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        Yoshinori Sato <ysato@users.sourceforge.jp>,
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        Geert Uytterhoeven <geert+renesas@glider.be>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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On Mon, Jan 11, 2021 at 9:19 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> On Fri, Jan 8, 2021 at 11:55 PM Arnd Bergmann <arnd@kernel.org> wrote:
> > * MIPS R3000/TX39xx: 32-bit MIPS-II generation, mostly superseded by
> >   64-bit MIPS-III (R4000 and higher) starting in 1991. arch/mips still
> >   supports these in DECstation and Toshiba Txx9, but it appears that most
> >   of those machines are of the 64-bit kind. Later MIPS32 such as 4Kc and
> >   later are rather different and widely used.
>
> I have a (32-bit) RBTX4927 development board in my board farm, boot-test
> every bi-weekly renesas-drivers release on it, and fix kernel issues
> when they appear.

Right, I was specifically thinking of the MIPS-II/R3000 ones here, I know
there are users on multiple actively maintained MIPS-III platforms.

Regarding 32-bit vs 64-bit kernels, can you clarify what makes this one
a 32-bit board? Is this just your preference for which kernel you install,
or are there dependencies on firmware or hardware that require running
this machine in 32-bit mode?

(MIPS is not my area anyway, I'm just curious)

       Arnd