Date: Sat, 25 Jan 2014 10:50:45 -0700 From: Warner Losh <imp@bsdimp.com> To: Glen Barber <gjb@FreeBSD.org> Cc: freebsd-arm@FreeBSD.org Subject: Re: Rasbperry Pi, what should TARGET_ARCH be? Message-ID: <EEBDA9FC-ADCC-4C0E-A224-BB0DA234E717@bsdimp.com> In-Reply-To: <20140125044043.GT52955@glenbarber.us>
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On Jan 24, 2014, at 9:40 PM, Glen Barber wrote: > Hi, > > I've been working on adding support for embedded systems to the release > scripts, which set up a chroot to ensure a clean build environment, then > runs Tim's Crochet scripts. > > For the RPI-B, recent updates to the build scripts work fine for > 11.0-CURRENT and 10.0-STABLE. However, 10.0-RELEASE images fail to > boot. If that worked, it worked by accident. > I showed output from 'uname -pm' out-of-band of an 11.0-CURRENT image, > and was suspicious that the output showed 'arm arm', not 'arm armv6'. > Warner had the same impression it should be 'arm armv6'. > > Hiren poked around the Crochet code, and saw that 'TARGET_ARCH=arm' is > set for the RaspberryPi board by default. This is incorrect. > As a "just in case" experiment, I retried the 10.0-RELEASE code > (release/10.0.0/) with TARGET_ARCH=armv6, and sure enough, it works. > > But, I don't know *why*. It works because that's the architecture that the RPi runs. > Is this a change between head/ and stable/10/ versus releng/10.0/ ? > > I can handle a differentiation between the branches with regard to this > (sort of), but I want to make sure the correct TARGET_ARCH is being set > across the different branches, so it can be handled properly in the > build scripts, and usable images can be produced. The definition should be the same on both branches. You must use TARGET_ARCH=armv6 on all known branches to produce working code. You might get lucky and get TARGET_ARCH=arm and have it work, but that's most definitely not a supported configuration. > So, what should be used? And where? For RPi, TARGET_ARCH=armv6 everywhere on all branches >= 9. RPi isn't supported 8 and lower. Warner > Thanks for any input, > > Glen >help
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