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=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 31FB5C4361B for ; Fri, 18 Dec 2020 22:29:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E69A42343F for ; Fri, 18 Dec 2020 22:29:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726288AbgLRW2u (ORCPT ); Fri, 18 Dec 2020 17:28:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48892 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726117AbgLRW2t (ORCPT ); Fri, 18 Dec 2020 17:28:49 -0500 Received: from mail-il1-x131.google.com (mail-il1-x131.google.com [IPv6:2607:f8b0:4864:20::131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 795F1C0617A7; Fri, 18 Dec 2020 14:28:09 -0800 (PST) Received: by mail-il1-x131.google.com with SMTP id q1so3602426ilt.6; Fri, 18 Dec 2020 14:28:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=ZjpjdjP/kx6CmrGSWKO3qDoSaGWe4tkhPwI5BTAB6Hg=; b=mjniCRyiPZkXoykePXVkZ0bS77EKQD9F/T55XbhY7/Sj3RfOVyppEncN3kSwQUwToj iIDx6Z0v3RoA8MLg85Jb8hiMz915VWqFAuiYUU6kEIalyXVClMt8sQGa1oftIeQOcGWk F6YflUxRbzvNZl9ePaSgqfkah1KvqAcqYBPyMlhdVzPt6YjiaE388HUhFAO6lCJ+3EQy bb6VF7UCtN+zWzp2AJF0JQe7OoHtltGd53ge6btLsqwb2T9aJKKf5KCF/yYlTEb74Azd ZuAQvnXE+bfBwLnY4buYL8P144Cl7dAjy9ETb2FnoFyyr/YqNWvbKTtSKlT0ev09OWB4 qNKA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=ZjpjdjP/kx6CmrGSWKO3qDoSaGWe4tkhPwI5BTAB6Hg=; b=lg5cIEuAl/0sR/HPbl/KuViU1LR2XtCfDmBRCp1DWLJXZ98Wr0ua3c9mB09RfUHrqw +QDCGVDnCUon0TbCcBjAxeWBCzEWdxIBYGrhq+yvsYcbs1llkQevMLmjnRgMxn4rSi0W xhzDjXzew5/CG+TrR9CREF36B7ZMZ7M6+kpiTwvAiHi/6wLLcMXyCXLbEqHgn9Sep/bg WuHWB4IDjv/f7k/hZmiwMUse7K55heTtJGFNexUz85E8Z8NJJW6ibp9gN9buecustyB/ vsjxWxxmaKNm4AHjLdXrEvF3u+FwFK9TxdGv8CxP/1obrDqI0IrqtnOxLcZI+R24SP43 oq9w== X-Gm-Message-State: AOAM531NN/S3SQlSBiDrB26DnAG2noGK2lS7e24u2o9QLjyBbWYKazVG wAz0vxe1tzW7V+k3IXLYUsjenDhn4iY/csk0a9k= X-Google-Smtp-Source: ABdhPJz4V2ybF74i3zOnSHOmYeV46WBCxPwW1bWE9wxqp/hie6Lvqw4UTUeQY9H8xEQ+qX/UkbvcpHVQGAYBcXYWHHc= X-Received: by 2002:a05:6e02:8d:: with SMTP id l13mr6310898ilm.163.1608330488850; Fri, 18 Dec 2020 14:28:08 -0800 (PST) MIME-Version: 1.0 Received: by 2002:a5e:dd01:0:0:0:0:0 with HTTP; Fri, 18 Dec 2020 14:28:08 -0800 (PST) In-Reply-To: <20201218184347.2180772-1-sam@ravnborg.org> References: <20201218184347.2180772-1-sam@ravnborg.org> From: Kjetil Oftedal Date: Fri, 18 Dec 2020 23:28:08 +0100 Message-ID: Subject: Re: [RFC PATCH 0/13] sparc32: sunset sun4m and sun4d To: Sam Ravnborg Cc: David S Miller , sparclinux@vger.kernel.org, Andreas Larsson , Arnd Bergmann , Alexey Dobriyan , Al Viro , Andrew Morton , Anshuman Khandual , Arvind Sankar , Christian Brauner , Denis Efremov , Dmitry Safonov <0x7f454c46@gmail.com>, Geert Uytterhoeven , Greg Kroah-Hartman , Ira Weiny , Lorenzo Pieralisi , Mark Rutland , Mike Rapoport , Pekka Enberg , Peter Zijlstra , Stephen Rothwell , Thomas Gleixner , Will Deacon , Willy Tarreau , linux-kernel@vger.kernel.org, debian-sparc@lists.debian.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 18/12/2020, Sam Ravnborg wrote: > The sun4m and sun4d based SPARC machines was very popular in the > 90'ties and was then replaced by the more powerful sparc64 > class of machines. > Today there is only Gentoo that to my best knowledge supports > sparc32 and people have moved on to more capable HW. > > Cobham Gaisler have variants of the LEON processer that > runs sparc32 - and they are in production today. > > With this patchset I propose to sunset sun4m and sun4d and move > focus to a more streamlined support for LEON. > > One downside is that qemu supports sun4m - and we may loose > some testing possibilities when sun4m is dropped. qemu supports > LEON to some degree - I have not yet tried it out. > > Andreas from Gaisler have indicated that they may be more active > upstream on sparc32 - and this will only be easier with a kernel > where the legacy stuff is dropped. > This makes me a bit sad. But I guess I haven't had any time to put into the sparc32 port for many years, so I guess it is time to let go. But I do believe that by doing this we should make sure we are not putting ourselves in a position where the sparc kernel-developers don't have access to any real sparc32 hardware. SUN machines were at least plentiful. The LEON-family of processors being targeted towards the rad-hardened market are not so much available. Maybe Gaisler can contribute some systems, or make some available remotely? Best regards, Kjetil Oftedal From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kjetil Oftedal Date: Fri, 18 Dec 2020 22:28:08 +0000 Subject: Re: [RFC PATCH 0/13] sparc32: sunset sun4m and sun4d Message-Id: List-Id: References: <20201218184347.2180772-1-sam@ravnborg.org> In-Reply-To: <20201218184347.2180772-1-sam@ravnborg.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Sam Ravnborg Cc: David S Miller , sparclinux@vger.kernel.org, Andreas Larsson , Arnd Bergmann , Alexey Dobriyan , Al Viro , Andrew Morton , Anshuman Khandual , Arvind Sankar , Christian Brauner , Denis Efremov , Dmitry Safonov <0x7f454c46@gmail.com>, Geert Uytterhoeven , Greg Kroah-Hartman , Ira Weiny , Lorenzo Pieralisi , Mark Rutland , Mike Rapoport , Pekka Enberg , Peter Zijlstra , Stephen Rothwell , Thomas Gleixner , Will Deacon , Willy Tarreau , linux-kernel@vger.kernel.org, debian-sparc@lists.debian.org On 18/12/2020, Sam Ravnborg wrote: > The sun4m and sun4d based SPARC machines was very popular in the > 90'ties and was then replaced by the more powerful sparc64 > class of machines. > Today there is only Gentoo that to my best knowledge supports > sparc32 and people have moved on to more capable HW. > > Cobham Gaisler have variants of the LEON processer that > runs sparc32 - and they are in production today. > > With this patchset I propose to sunset sun4m and sun4d and move > focus to a more streamlined support for LEON. > > One downside is that qemu supports sun4m - and we may loose > some testing possibilities when sun4m is dropped. qemu supports > LEON to some degree - I have not yet tried it out. > > Andreas from Gaisler have indicated that they may be more active > upstream on sparc32 - and this will only be easier with a kernel > where the legacy stuff is dropped. > This makes me a bit sad. But I guess I haven't had any time to put into the sparc32 port for many years, so I guess it is time to let go. But I do believe that by doing this we should make sure we are not putting ourselves in a position where the sparc kernel-developers don't have access to any real sparc32 hardware. SUN machines were at least plentiful. The LEON-family of processors being targeted towards the rad-hardened market are not so much available. Maybe Gaisler can contribute some systems, or make some available remotely? Best regards, Kjetil Oftedal