Date: Fri, 27 May 2016 12:15:38 -0600 From: Ian Lepore <ian@freebsd.org> To: Mark Millard <markmi@dsl-only.net>, Matthias Andree <matthias.andree@gmx.de> Cc: freebsd-arm <freebsd-arm@freebsd.org>, FreeBSD Toolchain <freebsd-toolchain@freebsd.org>, Cedric Blancher <cedric.blancher@gmail.com>, freebsd-sparc64@freebsd.org Subject: Re: Are there SPARC [or other] aligned memory access requirements to avoid exceptions? [now that 11.0's armv6/v7 is allowing more unaligned accesses] Message-ID: <1464372938.1204.98.camel@freebsd.org> In-Reply-To: <C15677FD-F3D2-4EC1-AD10-606780880B87@dsl-only.net> References: <7AFD3661-9764-434B-A387-FD31B62DD77E@dsl-only.net> <CALXu0Uer=nOKBvd8x%2Bf=7F36603LRpkarAY4QOqau-4n_sLqQw@mail.gmail.com> <F79AE83A-B973-4FA1-BC6C-18FC24F6C41F@dsl-only.net> <CALXu0Uc2Ssqs5OzCpTZs0Mcy4Y0ZQBzKAJPpT1LjnMoD-8updg@mail.gmail.com> <5747F78A.5020103@gmx.de> <C15677FD-F3D2-4EC1-AD10-606780880B87@dsl-only.net>
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On Fri, 2016-05-27 at 04:35 -0700, Mark Millard wrote: > On 2016-May-27, at 12:30 AM, Matthias Andree <matthias.andree@gmx.de> > wrote: > > > Am 27.05.2016 um 06:14 schrieb Cedric Blancher: > > > [...] > The rpi<?> vintage matters: > > Original rpi's (before rpi2): ARM1176JZF-S, 32-bit (not armv6 nor > armv7-a/cortex-a7) > 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. Bottom line: this is an old slow chip and you'll be nothing but frustrated using it. If you're going to get an rpi, get the much faster rpi2, which is a quad-core system. These days you may be even better off with something even newer based on the Allwinner chips (banana pi, cubieboard, a bunch of others), thanks to the excellent support work done recent (and still happening) by Jarred and Emmanuel. But I'm not sure of the price comparisons. -- Ian
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