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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Mon, 11 Jan 2021 10:16:17 +0100
Message-ID: <CAMuHMdUod26OPXyYG_xmkYgeKELdBJtmojYxDQoz53Dxip77Nw@mail.gmail.com>
Subject: Re: Old platforms: bring out your dead
To:     Arnd Bergmann <arnd@kernel.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>,
        Oleksij Rempel <o.rempel@pengutronix.de>,
        Baruch Siach <baruch@tkos.co.il>,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
        Daniel Tang <dt.tangr@gmail.com>,
        =?UTF-8?Q?Uwe_Kleine=2DK=C3=B6nig?= 
        <u.kleine-koenig@pengutronix.de>, Jamie Iles <jamie@jamieiles.com>,
        Barry Song <song.bao.hua@hisilicon.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Jonas Jensen <jonas.jensen@gmail.com>,
        Marc Gonzalez <marc.w.gonzalez@free.fr>,
        Hartley Sweeten <hsweeten@visionengravers.com>,
        Lubomir Rintel <lkundrak@v3.sk>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Shawn Guo <shawnguo@kernel.org>, Alex Elder <elder@linaro.org>,
        Alexander Shiyan <shc_work@mail.ru>,
        Koen Vandeputte <koen.vandeputte@ncentric.com>,
        Hans Ulli Kroll <ulli.kroll@googlemail.com>,
        Vladimir Zapolskiy <vz@mleia.com>,
        Wei Xu <xuwei5@hisilicon.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Mark Salter <msalter@redhat.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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Hi Arnd,

On Mon, Jan 11, 2021 at 9:59 AM Arnd Bergmann <arnd@kernel.org> wrote:
> 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 * MIPS R3000/TX39xx: 32-bit MIPS-II generation, mostly superseded by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?

TX492x is 32-bit (/proc/cpuinfo says mips1/mips2/mips3), TX493x is 64-bit.
As Debian dropped support for mips3 and older, I'm stuck at a Jessie nfsroot.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds