Date: Tue, 30 Oct 2012 12:17:52 -0600 From: Warner Losh <imp@bsdimp.com> To: Adrian Chadd <adrian@freebsd.org> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, Alie Tan <alie@affle.com> Subject: Re: BeagleBone questions (was Re: Towards an ARM system-building script) Message-ID: <21AB4822-FEB2-45D9-A642-AED5B41DD1E0@bsdimp.com> In-Reply-To: <CAJ-VmonSD3DS4T4NSQ%2B%2BXS=yQKUTVuVsz219t0zqKHwk67Wgeg@mail.gmail.com> References: <CANuCnH-Y_Bixer7s5EEU4sJVjRC7s3QQbpJeevdXTpxS2K0OqA@mail.gmail.com> <2E208EEB-B2CF-4AC6-B420-03FB4CF08041@freebsd.org> <1351522908.1123.356.camel@revolution.hippie.lan> <CANuCnH9KcRvp2yKeKg6Tp%2Ba2tZLc7RdhRzQiQ9C2VDcHZwAEEg@mail.gmail.com> <CAJ-VmokQmJbr0P4xp9PHHXC5_q0Fte18atvQu28QX%2B2oZiYmrw@mail.gmail.com> <1351550400.1123.364.camel@revolution.hippie.lan> <CANuCnH_Dc1XWUmhHmmpOHTGy%2Bjh5AjuVrOzVKE-QA=3zjfTDRA@mail.gmail.com> <CAJ-Vmom3oPr_e4BrR6-qV0bwLL9S39RJo-hUxo3XYfni71dn8g@mail.gmail.com> <CAJ-Vmont=W5fsF_rw0VBQ1V9Ki0GzXtmmaJUgfPbQWUTHbrOXA@mail.gmail.com> <90863217-BF71-4DE4-9EB8-D320C48CCAAA@bsdimp.com> <CAJ-VmonSD3DS4T4NSQ%2B%2BXS=yQKUTVuVsz219t0zqKHwk67Wgeg@mail.gmail.com>
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On Oct 30, 2012, at 10:58 AM, Adrian Chadd wrote: > On 30 October 2012 09:31, Warner Losh <imp@bsdimp.com> wrote: >>=20 >> On Oct 30, 2012, at 10:20 AM, Adrian Chadd wrote: >>=20 >>> .. ah. armv5 has no sleep "halt" function, so it's just spinning. >>> Chances are that's a good candidate for why things are running too >>> warm. >>=20 >> Each SoC has its own flavor of this with varying degrees of = latency... >=20 > Yeah, but the armv5 code doesn't do this, it just defaults to > cpufunc_null or whatever it's called. Hence, there's no idle halt / > wait-for-interrupt being done. that's right. My point was more 'each SoC needs to do something = special, and we support a lot of SoCs' with a little bit of a dig at = there not being a latency hint that the SoC could use to pick between = different options. Warner
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