linux-kernel - Re: [PATCH 00/16] remove eight obsolete architectures

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Date:   Fri, 16 Mar 2018 10:20:16 +0530
From:   afzal mohammed <afzal.mohd.ma@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     David Howells <dhowells@...hat.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        linux-block <linux-block@...r.kernel.org>,
        IDE-ML <linux-ide@...r.kernel.org>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        linux-pwm@...r.kernel.org, linux-rtc@...r.kernel.org,
        linux-spi <linux-spi@...r.kernel.org>, linux-usb@...r.kernel.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-fbdev@...r.kernel.org, linux-watchdog@...r.kernel.org,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH 00/16] remove eight obsolete architectures

Hi,

On Thu, Mar 15, 2018 at 10:56:48AM +0100, Arnd Bergmann wrote:
> On Thu, Mar 15, 2018 at 10:42 AM, David Howells <dhowells@...hat.com> wrote:

> > Do we have anything left that still implements NOMMU?

Please don't kill !MMU.

> Yes, plenty.

> I've made an overview of the remaining architectures for my own reference[1].
> The remaining NOMMU architectures are:
> 
> - arch/arm has ARMv7-M (Cortex-M microcontroller), which is actually
> gaining traction

ARMv7-R as well, also seems ARM is coming up with more !MMU's - v8-M,
v8-R. In addition, though only of academic interest, ARM MMU capable
platform's can run !MMU Linux.

afzal

> - arch/sh has an open-source J2 core that was added not that long ago,
> it seems to
>   be the only SH compatible core that anyone is working on.
> - arch/microblaze supports both MMU/NOMMU modes (most use an MMU)
> - arch/m68k supports several NOMMU targets, both the coldfire SoCs and the
>   classic processors
> - c6x has no MMU