Date: Wed, 27 Nov 2019 10:01:21 +1100 From: Trev <freebsd-arm@sentry.org> To: freebsd-arm@freebsd.org Cc: Ian Lepore <ian@freebsd.org> Subject: Re: rpi3 clock drift Message-ID: <62e85ced-5d92-ac2b-f26d-85a2529a5813@sentry.org> In-Reply-To: <486c0bc46deeefb8338f50fe6dfdf7951786e56c.camel@freebsd.org> References: <MWHPR06MB3134CD05551D36CC3B45D368AA450@MWHPR06MB3134.namprd06.prod.outlook.com> <c5942861c2aa0929239e59a000ce76407f4fd191.camel@freebsd.org> <MWHPR06MB31341D8CB3BBF98153B55A74AA450@MWHPR06MB3134.namprd06.prod.outlook.com> <486c0bc46deeefb8338f50fe6dfdf7951786e56c.camel@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Ian Lepore wrote on 27/11/2019 09:48: > On Tue, 2019-11-26 at 22:34 +0000, James Shuriff wrote: >> kern.timecounter.tc.ARM MPCore Timecounter.frequency: 54000000 > > 54 MHz seems like a very strange frequency for a clock in an arm > system. Of course, everything about an RPi seems to be strange and > non-standard. > > Can someone else with an rpi3 (which keeps good time) confirm that > that's the usual number? trev@rpi3 [/home/trev] $ sysctl kern.timecounter kern.timecounter.fast_gettime: 1 kern.timecounter.tick: 1 kern.timecounter.choice: ARM MPCore Timecounter(1000) dummy(-1000000) kern.timecounter.hardware: ARM MPCore Timecounter kern.timecounter.stepwarnings: 0 kern.timecounter.tc.ARM MPCore Timecounter.quality: 1000 kern.timecounter.tc.ARM MPCore Timecounter.frequency: 19200000 kern.timecounter.tc.ARM MPCore Timecounter.counter: 1615733797 kern.timecounter.tc.ARM MPCore Timecounter.mask: 4294967295 trev@rpi3 [/home/trev] $ uname -a FreeBSD rpi3.sentry.org 13.0-CURRENT FreeBSD 13.0-CURRENT r344513 RPI3B arm64
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?62e85ced-5d92-ac2b-f26d-85a2529a5813>