From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 79E6DC48BD6 for ; Wed, 26 Jun 2019 11:25:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5A8372080C for ; Wed, 26 Jun 2019 11:25:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727230AbfFZLZ1 (ORCPT ); Wed, 26 Jun 2019 07:25:27 -0400 Received: from mail02.asahi-net.or.jp ([202.224.55.14]:47378 "EHLO mail02.asahi-net.or.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725930AbfFZLZ1 (ORCPT ); Wed, 26 Jun 2019 07:25:27 -0400 Received: from h61-195-96-97.vps.ablenet.jp (h61-195-96-97.ablenetvps.ne.jp [61.195.96.97]) (Authenticated sender: PQ4Y-STU) by mail02.asahi-net.or.jp (Postfix) with ESMTPA id 0D47647375; Wed, 26 Jun 2019 20:25:22 +0900 (JST) Received: from yo-satoh-debian.ysato.ml (p033253.dynamic.ppp.asahi-net.or.jp [221.113.33.253]) by h61-195-96-97.vps.ablenet.jp (Postfix) with ESMTPSA id A1DC6240085; Wed, 26 Jun 2019 20:25:21 +0900 (JST) Date: Wed, 26 Jun 2019 20:25:20 +0900 Message-ID: <87tvccr3kv.wl-ysato@users.sourceforge.jp> From: Yoshinori Sato To: Arnd Bergmann Cc: Rich Felker , John Paul Adrian Glaubitz , Adam Borowski , Christoph Hellwig , Linus Torvalds , Linux-sh list , linux-arch , Linux Kernel Mailing List Subject: Re: [RFC] remove arch/sh? In-Reply-To: References: <20190625085616.GA32399@lst.de> <20190625112146.GA9580@angband.pl> <401b12c0-d175-2720-d26c-b96ce3b28c71@physik.fu-berlin.de> <20190625142832.GD1506@brightrain.aerifal.cx> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM/1.14.9 (=?ISO-8859-4?Q?Goj=F2?=) APEL/10.8 EasyPG/1.0.0 Emacs/25.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 26 Jun 2019 00:48:09 +0900, Arnd Bergmann wrote: > > On Tue, Jun 25, 2019 at 4:28 PM Rich Felker wrote: > > On Tue, Jun 25, 2019 at 02:50:01PM +0200, Arnd Bergmann wrote: > > > don't build, or are incomplete and not worked on for a long > > > time, compared to the bits that are known to work and that someone > > > is still using or at least playing with. > > > I guess a lot of the SoCs that have no board support other than > > > the Hitachi/Renesas reference platform can go away too, as any products > > > based on those boards have long stopped updating their kernels. > > > > My intent here was always, after getting device tree theoretically > > working for some reasonable subset of socs/boards, drop the rest and > > add them back as dts files (possibly plus some small drivers) only if > > there's demand/complaint about regression. > > Do you still think that this is a likely scenario for the future though? > > If nobody's actively working on the DT support for the old chips and > this is unlikely to change soon, removing the known-broken bits earlier > should at least make it easier to keep maintaining the working bits > afterwards. > > FWIW, I went through the SH2, SH2A and SH3 based boards that > are supported in the kernel and found almost all of them to > be just reference platforms, with no actual product ever merged. > IIRC the idea back then was that users would supply their > own board files as an add-on patch, but I would consider all the > ones that did to be obsolete now. > > HP Jornada 6xx is the main machine that was once supported, but > given that according to the defconfig file it only comes with 4MB > of RAM, it is unlikely to still boot any 5.x kernel, let alone user > space (wikipedia claims there were models with 16MB of RAM, > but that is still not a lot these days). > > "Magicpanel" was another product that is supported in theory, but > the google search showed the 2007 patch for the required > flash storage driver that was never merged. > > Maybe everything but J2 and SH4(a) can just get retired? > > Arnd I also have some boards, so it's possible to rewrite more. I can not rewrite the target I do not have, so I think that there is nothing but to retire. There are too many unique parts of SH and it will be difficult to maintain in the future. -- Yosinori Sato