Re: [PATCH 2/2] ARM: remove support for NOMMU ARMv4/v5
From: Robin Murphy
Date: Thu Mar 10 2022 - 09:26:18 EST
On 2022-03-10 09:23, Arnd Bergmann wrote:
On Thu, Mar 10, 2022 at 2:22 AM Linus Walleij <linus.walleij@xxxxxxxxxx> wrote:
On Wed, Mar 9, 2022 at 5:17 PM Arnd Bergmann <arnd@xxxxxxxxxx> 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.
FWIW I have an Integrator/CM1026 that I'd love to play with purely for
giggles, but it needs some serious archaeology to find and flash some
firmware for it first.
I also have a couple of "real" ARM1026s in the form of Conexant
Solos-based routers[1] which I've done a little hacking on, but don't
see myself ever realistically having enough time or motivation to
actually upstream anything. And at this point I don't see OpenWRT having
any more interest in boards with only 15MB of RAM (yes, they really do
boot with "mem=15M" to reserve 1MB for the modem...)
Cheers,
Robin.
[1] https://openwrt.org/toh/linksys/wag54g2