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

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Date:   Mon, 11 Jan 2021 11:28:20 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...nel.org>
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

Hi Arnd,

On Mon, Jan 11, 2021 at 10:16 AM Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> On Mon, Jan 11, 2021 at 9:59 AM Arnd Bergmann <arnd@...nel.org> wrote:
> > On Mon, Jan 11, 2021 at 9:19 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > > On Fri, Jan 8, 2021 at 11:55 PM Arnd Bergmann <arnd@...nel.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 * MIPS R3000/TX39xx: 32-bit MIPS-II generation, mostly superseded by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.

Upon closer look, all TX49xx are 64-bit, but the VxWorks boot loader
refuses to boot 64-bit kernels ("Size is incorrect"), hence I settled
for a 32-bit kernel config a long time ago.
Probably I need to write a 32-bit bootwrapper first. which would allow
me to upgrade the Debian userland beyond jessie using mips64el?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-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