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[209.132.180.67]) by mx.google.com with ESMTP id h22-v6si3995879plr.668.2018.03.15.07.20.07; Thu, 15 Mar 2018 07:20:22 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=bombadil.20170209 header.b=EXhRXPFP; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752187AbeCOOR6 (ORCPT + 99 others); Thu, 15 Mar 2018 10:17:58 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:49832 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751551AbeCOORx (ORCPT ); Thu, 15 Mar 2018 10:17:53 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=877zoFDCjBQwx+KqfkcKMUpi1LQufgjEsBZNJ0oPjcA=; b=EXhRXPFP9V1Mco6Q4o3jqaRu0 oLzgvnyNTStu34PZkK3msqZ2y2l/deupxM5cHQLHCbeWt/ds/8+JdJjNCFVLW5LL8zzU0pkaIKv98 EM+ZVz+Uo5MEtNlYRa9AM76bw9D2LuzvHr/3XbjrRoFxUy03R4OFlz8etn8kufOexZ8/qlHEGNQO2 iB3dTgC4J63qEBMUr8xBYQT6vy9AOo0C0EONmeAadsHydlBcVZNyw5GJuhIHSKK07cNqhwpNPWLo4 q8zkNlmNNev4BnmMDowClm33G7RfhHl7QRcmT2JSpja3YUNQi7/uFbU67h5MMcZ8po3ooHmpBuTQZ Kv7IEmpyQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1ewThW-00034V-3B; Thu, 15 Mar 2018 14:17:50 +0000 Date: Thu, 15 Mar 2018 07:17:49 -0700 From: Christoph Hellwig To: Arnd Bergmann Cc: Hannes Reinecke , David Howells , linux-arch , Linux Kernel Mailing List , "open list:DOCUMENTATION" , linux-block , IDE-ML , "open list:HID CORE LAYER" , Networking , linux-wireless , linux-pwm@vger.kernel.org, linux-rtc@vger.kernel.org, linux-spi , linux-usb@vger.kernel.org, dri-devel , linux-fbdev@vger.kernel.org, linux-watchdog@vger.kernel.org, Linux FS-devel Mailing List , Linux-MM Subject: Re: [PATCH 00/16] remove eight obsolete architectures Message-ID: <20180315141749.GA27100@infradead.org> References: <20180314143529.1456168-1-arnd@arndb.de> <2929.1521106970@warthog.procyon.org.uk> <6c9d075c-d7a8-72a5-9b2d-af1feaa06c6c@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.2 (2017-12-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.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.