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=-3.8 required=3.0 tests=BAYES_00, 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 587C9C433E6 for ; Mon, 11 Jan 2021 09:38:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 128FE22A84 for ; Mon, 11 Jan 2021 09:38:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725897AbhAKJh4 (ORCPT ); Mon, 11 Jan 2021 04:37:56 -0500 Received: from mail-ot1-f49.google.com ([209.85.210.49]:38505 "EHLO mail-ot1-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728494AbhAKJho (ORCPT ); Mon, 11 Jan 2021 04:37:44 -0500 Received: by mail-ot1-f49.google.com with SMTP id j20so16305034otq.5 for ; Mon, 11 Jan 2021 01:37:29 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=TL0qEC8VyLvfk6/0XMSittUYFqguLqcOb1FSq3dtCW0=; b=BirEWZf254KfcCChqbEw3RnD0YrCEH03nks3IEP3FXwMik8Y2+VrLAStM0eidO5S4+ ou55Hbg2LiJTverUa4nYAkLEK3gUjBflYb1Q+vAy9jgBQfdlRdS4nZHe8IQR7Yjd/UwL c9/wgleEs+7VqcxM60aZx2APC3SDFU4OJtL3xe7Cc7iySp1lIkl+RnKCgo8j2mw63vyx 4nTrlOlfyLnyJwwWrMC46ejuGgurFV+eRHejuv7Ih2iLJpnoAN91dAVrZqkNvFkXIF/J HR9wMTFtDVOKkbeCFl32gcbG+cz7XrqdCnvrft4F+qxibj/XB9Vy9R3hx72QT5bwkMvL x16Q== X-Gm-Message-State: AOAM533GInz/QD3ZSQHSCKjGkEXHmkzvT7cQ0Iak0UTWypYyCdmiD4QK S1XK05AEjGmoH1Tl3wyiJM9t8wNcz7KO6TlPfJQ= X-Google-Smtp-Source: ABdhPJwSMmuGp2OZxS0h1K5iXabLbFdL3Te0I+cEmDEVc+mcS9nGMONUn+Am8fSrvTAzlp5aYrYpF9Kn4HIFUErYMaE= X-Received: by 2002:a05:6830:210a:: with SMTP id i10mr10460944otc.145.1610357823615; Mon, 11 Jan 2021 01:37:03 -0800 (PST) MIME-Version: 1.0 References: <803a40ba-d0cb-e5e2-9d57-f1b70d7aee37@physik.fu-berlin.de> In-Reply-To: <803a40ba-d0cb-e5e2-9d57-f1b70d7aee37@physik.fu-berlin.de> From: Geert Uytterhoeven Date: Mon, 11 Jan 2021 10:36:51 +0100 Message-ID: Subject: Re: Old platforms: bring out your dead To: John Paul Adrian Glaubitz Cc: Daniel Palmer , Linux ARM , Linux Kernel Mailing List , Krzysztof Adamski , Oleksij Rempel , Baruch Siach , Russell King - ARM Linux , Daniel Tang , =?UTF-8?Q?Uwe_Kleine=2DK=C3=B6nig?= , Jamie Iles , Barry Song , Viresh Kumar , Linus Walleij , Jonas Jensen , Marc Gonzalez , Hartley Sweeten , Lubomir Rintel , Neil Armstrong , Shawn Guo , Alex Elder , Alexander Shiyan , Koen Vandeputte , Hans Ulli Kroll , Vladimir Zapolskiy , Wei Xu , Steven Rostedt , Yoshinori Sato , Mark Salter , Michael Ellerman , Geert Uytterhoeven , Thomas Bogendoerfer , linux-m68k Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org Hi Adrian, On Mon, Jan 11, 2021 at 10:26 AM John Paul Adrian Glaubitz wrote: > On 1/11/21 10:20 AM, Geert Uytterhoeven wrote: > >> Sounds interesting. Do these SoCs come with an MMU? And do they use the > >> ColdFire instruction set or do they run plain 68k code? > > > > No MMU, plain m68k code. > > > > 68328 Soc = 68000 core + some peripherals, > > 68360 SoC = CPU32 core (based on 68020 + some peripherals. > > OK, I guess that would be useful for the NoMMU Linux port. Note that 68360 support was removed from the kernel in 2016, as Arnd said. > > Anyone working on integrating m68k (and SPARC and MIPS?) softcores in > > LiteX? ;-) > > I'm personally waiting for the Vampire to gain support for the real 68851 > as the hardware in general looks very attractive [1]. The 68851 is way too complex for what's needed (who needs support for 256 byte pages (https://lwn.net/Articles/839746/)?). They'd be better off implementing something simpler, like 68040 MMU support, or perhaps even a software-controlled TLB like most RISC architectures (incl. ColdFire?). The latter would require more changes to Linux, though. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds