From owner-freebsd-arm@freebsd.org Thu Jun 8 20:22:53 2017 Return-Path: Delivered-To: freebsd-arm@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E3C1BC79181 for ; Thu, 8 Jun 2017 20:22:53 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: from mail-io0-x230.google.com (mail-io0-x230.google.com [IPv6:2607:f8b0:4001:c06::230]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 2755B704F1 for ; Thu, 8 Jun 2017 20:22:53 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: by mail-io0-x230.google.com with SMTP id k93so25177709ioi.2 for ; Thu, 08 Jun 2017 13:22:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20150623.gappssmtp.com; s=20150623; h=mime-version:sender:from:date:message-id:subject:to; bh=+ht5lTLrEJ3Pp9L0FMEZK/m0LFUmnv7qLMumlOd5C/Q=; b=djEv5lGNLl2oArNbWCG69BSHPfVmUmIr/AZG8OgfWqczS18+YtjzLNVlptl8gI66fi yPcALGG7Oc2sJ2EHlhLnti8nDwUqwhtlSkEUgMXzCkUuoJr0VII0L4P5o6UbviqLFeXs ru/cilAM2GDwPsrd2jQIYXM+E5Xtl3m8umGURfrGYp4igjCSG+oq04/g1rV/X0uNWbiF Mxtr3a5qaUCySs60KSxMdquIvZQXYQZ1gOERuLwZI3Fw5nwcTGcdGdkR1hAOtTKQdWBa Zt0vQSqP0+lkYjcDVuEZQe3WVHGcJN+Ke2jbYjzRdlPkBieN0aw5h9A03Ilur8OtS2Eo ORCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:from:date:message-id:subject :to; bh=+ht5lTLrEJ3Pp9L0FMEZK/m0LFUmnv7qLMumlOd5C/Q=; b=Y7dk9ze6+9uTF9i2ysYPC8eUmuaRIIaLp9iEYmZOBcJA7J+kOU84aJz8Xvdfp/kTf5 rCe1oI9oUFW5y95j4d77x57lKFT67McIhui8+FA31xGs0OIan0xOfOJbGU5eQtEZRo+A 8E6pOvoe0E7c+E9WytE0vBmWbY79B30XOhJwkxzr7kBODFG8mVxXHhtjJsg/VmSp3WDt yL8712oE9+MVDrz1eGnlETWhxL2zmoAu7U2Pz0z8IuNFJn9CMF+B68yjxTZZADAVvfDF XEqOVCbYOy/Z/3Oi34iJzjPz63+02KYssPG0J+WyqJhZ7HL77EG8MEFbhwicnz2VRr4Y ENKw== X-Gm-Message-State: AKS2vOy5HVMg02GJ3il2yMqk3PVMaXdnm7IpcjJTjrzaFUbg7iZVkCYy /OtWYpBOg1RI4xx1rbdfrra/NOJdUwG3 X-Received: by 10.107.170.213 with SMTP id g82mr17006206ioj.148.1496953372002; Thu, 08 Jun 2017 13:22:52 -0700 (PDT) MIME-Version: 1.0 Sender: wlosh@bsdimp.com Received: by 10.79.192.69 with HTTP; Thu, 8 Jun 2017 13:22:51 -0700 (PDT) X-Originating-IP: [137.122.64.8] From: Warner Losh Date: Thu, 8 Jun 2017 16:22:51 -0400 X-Google-Sender-Auth: t_UbY-Iw2Jnzh6CfeiYgEouLf9o Message-ID: Subject: Deorbiting armv4 and armv5 support To: "freebsd-arm@freebsd.org" Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Jun 2017 20:22:54 -0000 Greetings, The pmap in armv4/5 has been broken for years at this point. It basically works, but has issues with unaligned buffers. Since these have remained unfixed for a long time, and most of the main ARM developers have given up trying to fix it, I think it would be best to retire the support rather than waste people's time that seem to be working only to discover after a lot of effort that it's busted. Since the consensus at the FreeBSD developer's summit appeared to be 'let's let it go'. It would remove the TARGET_ARCH arm and armeb. armv6 would remain unaffected (though see a parallel thread). Warner