Date: Wed, 8 Jun 2016 14:15:26 -0700 From: Russell Haley <russ.haley@gmail.com> To: "Isaac (.ike) Levy" <ike@blackskyresearch.net> Cc: Shawn Webb <shawn.webb@hardenedbsd.org>, freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: RPI3 Hackathon at BSDCan/Dev SUmmit Message-ID: <CABx9NuTmMvyLCmF8%2B99jPHTzW_p8K_3DtY90jEXtHgV1cK4sFw@mail.gmail.com> In-Reply-To: <8328C70D-51EA-4A0F-93A5-80CD665ECDFF@blackskyresearch.net> References: <20160607043134.GB22884@mutt-hardenedbsd> <CAN5odxDYeQMrK4G=5_GSn5Wj-R30J6ryTFBasfd=sR8nZzKGaw@mail.gmail.com> <20160607123450.GA75317@mutt-hardenedbsd> <20160608165711.GA63330@mutt-hardenedbsd> <CAN5odxCN6pt9BdyzF57oBM15x5b625T6%2B_51b5AtW4rEqgy7Vw@mail.gmail.com> <20160608170107.GB63330@mutt-hardenedbsd> <F0D7869D-A0A9-4810-B5BA-4BF655299F7B@blackskyresearch.net> <20160608182810.GC63330@mutt-hardenedbsd> <0E28F6C5-96BC-4696-AD8F-C898CA0082D9@blackskyresearch.net> <CABx9NuRzD_urJakzxyb5bsFzDsrqiHCoo6n3dWpuj9Vf-5uJ9Q@mail.gmail.com> <8328C70D-51EA-4A0F-93A5-80CD665ECDFF@blackskyresearch.net>
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So just in looking for answers I see that the ARM developers cross build page is out of date. https://wiki.freebsd.org/FreeBSD/arm/crossbuild and to be nit picky, the aarch64 pages sit outside the ARM section in the main wiki area. Shouldn't AARCH64 be a subset of ARM? Even if they are not re-organized, perhaps a short description about what each platform moniker means? Cheers, Russ On Wed, Jun 8, 2016 at 12:30 PM, Isaac (.ike) Levy <ike@blackskyresearch.net> wrote: > Thanks Russ, All, > >> On Jun 8, 2016, at 3:22 PM, Russell Haley <russ.haley@gmail.com> wrote: >> >> On Wed, Jun 8, 2016 at 11:56 AM, Isaac (.ike) Levy >> <ike@blackskyresearch.net> wrote: >>> >>>> On Jun 8, 2016, at 2:28 PM, Shawn Webb <shawn.webb@hardenedbsd.org> wrote: >>>> >>>> Your builds would be ARMv7, correct? As far as I know, there are no >>>> ARMv8 BeagleBone boards. >>> >>> Oh, I could be very mistaken- perhaps someone on list could help me understand this- (searching the web isn't helping me here), >>> >>> Can anyone on list here help me clarify the ARMv7 or ARMv8 architectures? >> >> Oh, oh, now you've done it... ha ha. This is very very very confusing >> due to both marketing terms and some incongruency in terminology. I'm >> just an amateur but I'm gonna take a shot at this so anyone who knows >> better please feel free to correct me. >> >> - Cortex-A8 is a marketing term for a specific processor design. This >> is an "ARM Ltd." design that can be licensed by anyone. >> >> - ARMv6, ARMv7 and ARMv8 are all different ARM *instruction sets*. >> Different processors and families use different instruction sets (also >> license-able by anyone to design their OWN processors). >> >> - The Beaglebone series uses the Texas Instruments am33XX processor >> family, which I think includes designs of both ARMv6 and ARMv7 >> variants. The ARMv7 variants are based on the Cortex-A8 design. The >> RPI2 uses a Broadcomm chip that is also a Cortex-A8 based processor >> (ARMv7). >> >> - Within FreeBSD, ARMv6 and ARMv7 are represented by one architecture >> (ARCH) which is called ARMv6 (as was recently lamented by Mr. Lapore). >> That's why you can't find reference to ARMv7. >> >> (This is where i start getting fuzzy on details) >> >> -The RPI3 is a 64 bit variant of the PRI development board. ARMv8 is >> the Arm 64 bit family of instruction sets. In FreeBSD, it's called >> AARCH64. That's why you won't see it mentioned as ARMv8. >> >> Hence, when referring to RPI 1, 1+ 2 or 2B, the term armv6 is thrown >> around and when discussing the RPI3 the term AARCH64 is used. >> >> I think...? tee hee. >> >> Cheers, >> >> Russ > > "RISC architecture is gonna change everything." > > I really appreciate this shot at an explanation, and would hazzard to say that clarity here is perhaps the biggest problem ARM platforms have going for them :) For users, far more confusing than Itanium vs. AMD64 ever was! > > Thanks again Russ. > > Best, > .ike > > >
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