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Date: Thu, 15 Mar 2018 07:17:49 -0700
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 00/16] remove eight obsolete architectures
Message-ID: <20180315141749.GA27100@infradead.org>
References: <20180314143529.1456168-1-arnd@arndb.de>
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To: Arnd Bergmann <arnd@arndb.de>
Cc: Hannes Reinecke <hare@suse.de>, David Howells <dhowells@redhat.com>, linux-arch <linux-arch@vger.kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>, linux-block <linux-block@vger.kernel.org>, IDE-ML <linux-ide@vger.kernel.org>, "open list:HID CORE LAYER" <linux-input@vger.kernel.org>, Networking <netdev@vger.kernel.org>, linux-wireless <linux-wireless@vger.kernel.org>, linux-pwm@vger.kernel.org, linux-rtc@vger.kernel.org, linux-spi <linux-spi@vger.kernel.org>, linux-usb@vger.kernel.org, dri-devel <dri-devel@lists.freedesktop.org>, linux-fbdev@vger.kernel.org, linux-watchdog@vger.kernel.org, Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>

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.