linux-kernel - Re: Old platforms: bring out your dead

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Date:   Mon, 11 Jan 2021 11:13:53 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Daniel Palmer <daniel@...f.com>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Krzysztof Adamski <krzysztof.adamski@...ia.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Baruch Siach <baruch@...s.co.il>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Daniel Tang <dt.tangr@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Jamie Iles <jamie@...ieiles.com>,
        Barry Song <song.bao.hua@...ilicon.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jonas Jensen <jonas.jensen@...il.com>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        Lubomir Rintel <lkundrak@...sk>,
        Neil Armstrong <narmstrong@...libre.com>,
        Shawn Guo <shawnguo@...nel.org>, Alex Elder <elder@...aro.org>,
        Alexander Shiyan <shc_work@...l.ru>,
        Koen Vandeputte <koen.vandeputte@...ntric.com>,
        Hans Ulli Kroll <ulli.kroll@...glemail.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Wei Xu <xuwei5@...ilicon.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Mark Salter <msalter@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: Re: Old platforms: bring out your dead

On Mon, Jan 11, 2021 at 2:40 AM Daniel Palmer <daniel@...f.com> wrote:
>
> Hi Arnd,
>
> On Sat, 9 Jan 2021 at 07:56, Arnd Bergmann <arnd@...nel.org> wrote:
> > * 68000/68328 (Dragonball): these are less capable than the
> >   68020+ or the Coldfire MCF5xxx line and similar to the 68360
> >   that was removed in 2016.
>
> I have some patches for the DragonBall series to enable SPI etc there,
> some patches to support the SuperVZ variant, some tools to upload
> Linux via the integrated serial bootloader.

Ah, good to know. Note that I recently did some cleanups for dragonball,
which were Greg merged into 5.10, but I don't think that he or anyone
else tested them on real hardware.

> The DragonBall is probably what anyone that wants to build a 68K retro
> computer should use as the DRAM controller is integrated and it can
> access 32MB of SDRAM.

I generally wouldn't recommend MMU-less hardware for new projects
any more, when your primary goal is to run the latest Linux kernel.

As recently as 2017, there was a lot of work going into a bunch of
platforms (J2, STM32, SAMV7, pre-v4e Coldfire, ...) in both user space
and kernel, but that seems have significantly slowed down in the
past years (K210 being the notable exception). The fewer users there
are on other NOMMU targets, the harder I expect it to get for the
remaining ones to keep it from breaking.

Of course, for a retro computer, that may not be relevant. If you
just want to run Vintage operating systems (including older
Linux kernels) and you just do it for fun, then this sounds like a
good choice.

> I haven't tested it recently but it should still work and I have
> hardware and I'm willing to look after it if no one else wants to.

For the purpose of documenting the current state, it would be
great if you could just do a minimal test on linux-5.10 to see if
anything broke since you last ran it.

       Arnd