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

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Message-ID: <20180315141749.GA27100@infradead.org>
Date:   Thu, 15 Mar 2018 07:17:49 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Hannes Reinecke <hare@...e.de>,
        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

On Thu, Mar 15, 2018 at 11:42:25AM +0100, Arnd Bergmann wrote:
> Is anyone producing a chip that includes enough of the Privileged ISA spec
> to have things like system calls, but not the MMU parts?

Various SiFive SOCs seem to support M and U mode, but no S mode or
iommu.  That should be enough for nommu Linux running in M mode if
someone cares enough to actually port it.