Date: Mon, 12 Jun 2017 10:36:40 -0700 From: Mark Millard <markmi@dsl-only.net> To: Warner Losh <imp@bsdimp.com> Cc: Russell Haley <russ.haley@gmail.com>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: Creating armv7 MACHINE_ARCH Message-ID: <B19EDB95-2A23-4F8F-8414-3F4E0E65AC4B@dsl-only.net> In-Reply-To: <CANCZdfrxTo8vLsnjU_VerO%2B3%2BU=06cok7%2BuKba3FM8_nXFozhQ@mail.gmail.com> References: <CANCZdfpUjPBRpxpmjtwK-wpiK=%2BwHscS4UmVeatrE7vrm260tw@mail.gmail.com> <20170612152808.6094931.74364.27128@gmail.com> <CANCZdfrxTo8vLsnjU_VerO%2B3%2BU=06cok7%2BuKba3FM8_nXFozhQ@mail.gmail.com>
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On 2017-Jun-12, at 8:39 AM, Warner Losh <imp at bsdimp.com> wrote: > . . . >=20 > Plus, we aren't quite doing what Ian wanted. He wanted a full rename. = The > proposal on the able is to add an armv7 TARGET_ARCH in 12. Not to = rename or > remove armv6. Sadly, that will still be there since the RPI foundation > keeps finding new ways to repackage the rpi into new boards that are = just > too cheap to ignore. On 2017-Jun-12, at 6:59 AM, Andrew Turner <andrew@fubar.geek.nz> wrote: > I like this. My understanding is adding armv7 would also fix many of = the currently broken ports that assume they are being built for armv7 as = many Linux distros target ARMv7+. >=20 > It should also be noted the GENERIC kernel is likely to only ever = target ARMv7+ even without an armv7 TARGET_ARCH. Hopefully the choices related to TARGET and TARGET_ARCH for armv7 end up identifying the context to port builds so that many would just automatically do the right thing. As for GENERIC: powerpc has. . . TARGET=3Dpowerpc TARGET_ARCH=3Dpowerpc and GENERIC TARGET=3Dpowerpc TARGET_ARCH=3Dpowerpc64 and GENERIC64 So there is precedent for more than one GENERIC* for a family, with which one being appropriate being based on TARGET_ARCH. For powerpc TARGET=3Dpowerpc implicitly uses TARGET_ARCH=3Dpowerpc when TARGET_ARCH is not specified (if I remember right). Which should be the default for armv6 vs. armv7 might go the other direction (TARGET_ARCH=3Darmv7 by default). Side note: A caution about talking about "rpi2" as an example. . . Raspberry Pi 2 Model B V1.2 is Cortex-A53 based (so arm64/aarch64). (A BCM2837, not a BCM2836.) This dates about to something like 2014 based on the pictures showing the (c) notice on the boards. V1.1 and before were armv7 (BCM2836) based. Unless a kernel and world are made that can also configure/handle a Cortex-A53 in a armv7-like manor there will be two different GENERIC builds in order to span the "rpi2" family, based on just V1.2+ vs. V1.1 and before. (A single, modern distribution of the official Raspbian software for the rpi2 does support all the V1.x boards if I understand right.) =3D=3D=3D Mark Millard markmi at dsl-only.net
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