From owner-freebsd-arm@freebsd.org Sat May 28 12:40:46 2016 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 B1220B4D2FA for ; Sat, 28 May 2016 12:40:46 +0000 (UTC) (envelope-from sylgar@gmail.com) Received: from mail-wm0-x231.google.com (mail-wm0-x231.google.com [IPv6:2a00:1450:400c:c09::231]) (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 46E6B11DD for ; Sat, 28 May 2016 12:40:46 +0000 (UTC) (envelope-from sylgar@gmail.com) Received: by mail-wm0-x231.google.com with SMTP id a136so25498715wme.0 for ; Sat, 28 May 2016 05:40:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:message-id:mime-version:subject:date:references:to:in-reply-to; bh=V5o5WEG5bIwlY3bsJbYqfiWXaYKWbh3Ms9R8KzAkxPo=; b=cZIkBdmKKtjrFrxs1smqQrW0f3BJEUTY0PbEo8HA8Pdgm/YjT4ad9qa/hXxOmYNMGM S5jnbbe/NsJgY6sx+U7d8SY5bdVtc4WTl2HmpwqI5akldGcRbpNHYDb0ruyS4S4Hc4fh PIUjasdrfvrsWZhFOIx6bFBRS0S08CQyRTY092VomrsX7EmkLPMdo7QGhsimUkx0APMS myBjg/vDe6/ZCEY92tPy0SVFqhSwtk2azSmhO95L6XSUfgunAZKrws8T7cCkBRpHie+6 ZmP1Dw2zDr3hKxb4XAREuE1YmFuV/PGb1Emy59npz4CLoD7GnNyXYyPVu53HQjJ4be9H BVEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:message-id:mime-version:subject:date :references:to:in-reply-to; bh=V5o5WEG5bIwlY3bsJbYqfiWXaYKWbh3Ms9R8KzAkxPo=; b=BT8EKnWGVbOtilQqB/Y6ibGpj/w50vId06NS58xoNYXevQ/+GLWlavozZ9NLKF9AMh Yt5zTCAa3PNBV3vNlV21NfLe3HIUuKYpVdliIy3J5YEnXD7pJQCUeOsIgkWiNEGvqktW UTJi2+uJpoD9Ztt05hdgZnesOo1WRoIlOO/K748TWF/8C1dEZbA8AvIcCP3Xn3AIW1ni BBk9HCClgoUtbI6nCVb35MNMRJ+vhrgb1oEU8zI5hPyT06VTtsNz+MNjN2KIjHwKrAxv JKx3DupAMd49/M3M44I+4H2172fF2HtQj6kBlcfam8EehqKgue/3MxGUVq8iRMV+p0PC gZFQ== X-Gm-Message-State: ALyK8tLcCwWl+2jozmYayG+tCCYzgTSD3v9wpcILqicjG9uKsNSQEm2JCelZ5jNQ0DLLjg== X-Received: by 10.28.45.200 with SMTP id t191mr3084176wmt.40.1464439244460; Sat, 28 May 2016 05:40:44 -0700 (PDT) Received: from [192.168.0.10] (plr75-1-82-226-218-68.fbx.proxad.net. [82.226.218.68]) by smtp.gmail.com with ESMTPSA id w9sm13403986wme.19.2016.05.28.05.40.42 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sat, 28 May 2016 05:40:43 -0700 (PDT) From: Sylvain Garrigues Message-Id: Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Subject: =?utf-8?Q?R=C3=A9p_=3A_Are_there_SPARC_=5Bor_other=5D_aligned_me?= =?utf-8?Q?mory_access_requirements_to_avoid_exceptions=3F_=5Bnow?= =?utf-8?Q?_that_11=2E0=27s_armv6/v7_is_allowing_more_unaligned_a?= =?utf-8?Q?ccesses=5D?= Date: Sat, 28 May 2016 14:40:41 +0200 References: To: freebsd-arm@freebsd.org In-Reply-To: X-Mailer: Apple Mail (2.3124) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.22 X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 28 May 2016 12:40:46 -0000 Hello Ian, > De: Ian Lepore >=20 > [=E2=80=A6] > Original rpi is indeed 1176JZF-S, which IS armv6. The differences > between it and armv7 are almost entirely in the cache maintenence > routines, and notably not in handling unaligned access the way we now > configure the hardware. Does that mean we now don=E2=80=99t support the RPI A/B version 1, or = more importantly the Raspberry Pi Zero, which is to my knowledge still = based on 1176JZF-S? I was planning to run FreeBSD on the Pi Zero for an important embedded = project, and would like to know better about the implications you = mentioned of the new way the hardware is now configured, as regards this = =C2=AB old =C2=BB armv6 cpu which doesn=E2=80=99t handle unaligned = access properly. Thank you very much, Sylvain.=