linux-kernel - Re: [PATCH 2/2] ARM: remove support for NOMMU ARMv4/v5

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Date:   Thu, 10 Mar 2022 10:23:27 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Robin Murphy <robin.murphy@....com>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        kernel test robot <lkp@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Anshuman Khandual <anshuman.khandual@....com>
Subject: Re: [PATCH 2/2] ARM: remove support for NOMMU ARMv4/v5

On Thu, Mar 10, 2022 at 2:22 AM Linus Walleij <linus.walleij@...aro.org> wrote:
>
> On Wed, Mar 9, 2022 at 5:17 PM Arnd Bergmann <arnd@...nel.org> wrote:
> > Robin
> > > In that case, it would probably make sense to garbage-collect all the
> > > configs, setup code and other stuff relating to older MMU-less CPU cores
> > > like ARM1156, ARM940, etc. at the same time.
> >
> > Right, good idea. These are only selected by CONFIG_ARCH_INTEGRATOR,
> > but that in turn doesn't build for CONFIG_MMU=n because it depends on
> > ARCH_MULTIPLATFORM. I'll send a patch for these.
>
> Just delete these, I do have these CPU tiles around but they are so obscure
> and I never got around to even testing to boot them.

Right, of course you couldn't boot test them because it has been
impossible to even select them in Kconfig for years. I've added
a patch to completely remove the five v4/v5 NOMMU cores now,
will send that later.

There are five more cores that are only referenced by mach-integrator
that are supposed to work (922T, 1020, 1020E, 1022, 1026). Have you
ever tested those, or should we consider removing them as well?

At some point, there was a proposal to add an arm10 based SoC
to mainline, but that never happened and I'm fairly sure it won't
come back now.

        Arnd