Date: Wed, 27 Nov 2019 08:33:13 +0000 From: James Shuriff <james@opentech.cc> To: Per Hedeland <per@hedeland.org>, Ian Lepore <ian@freebsd.org> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: RE: rpi3 clock drift Message-ID: <MWHPR06MB3134F4C5A908D5123AFC23F0AA440@MWHPR06MB3134.namprd06.prod.outlook.com> In-Reply-To: <925e99c9-d723-0209-5533-edf8cb7cc6c1@hedeland.org> References: <MWHPR06MB3134CD05551D36CC3B45D368AA450@MWHPR06MB3134.namprd06.prod.outlook.com> <c5942861c2aa0929239e59a000ce76407f4fd191.camel@freebsd.org> <MWHPR06MB31341D8CB3BBF98153B55A74AA450@MWHPR06MB3134.namprd06.prod.outlook.com> <486c0bc46deeefb8338f50fe6dfdf7951786e56c.camel@freebsd.org> <A9CDA147-01A1-4A5B-8270-9F986847EA64@kronometrix.org> <925e99c9-d723-0209-5533-edf8cb7cc6c1@hedeland.org>
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--_002_MWHPR06MB3134F4C5A908D5123AFC23F0AA440MWHPR06MB3134namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I've read that the Pi 4 may have a 54 MHz oscillator and anything prior to = that would have 19.2 MHz, which agrees with what everyone on this thread is= contributing. That makes me think I have a bad FDT. I looked at generic_ti= mer.c, which creates the ARM MPCore Timecounter and I think it's getting th= e frequency itself from FDT. Do you know where in particular it's getting t= his frequency from? The RPI3 build provided by FreeBSD uses an overlay called "pwm". It grabs i= t from the Raspberry Pi binary blob repo, in addition to "pi3-disable-bt" a= nd "mmc". I decompiled it and took a look at the source but there's no refe= rence to a 54 MHz clock. There is an "assigned-clock-rates =3D <0x5f5e100>;= ". I built my Raspberry Pi 3 B as close to how the FreeBSD image was set up= as possible. I build everything from source but I grabbed my config.txt fi= le from /usr/ports/sysutils/rpi-firmware/files/config_rpi3.txt. You can see= the attached file for details on how I set up the FAT partition. I had sta= rted adding support for the I2C RTC because I was hoping to use that as the= timecounter. Here is config.txt, straight from sysutils/rpi-firmware: arm_control=3D0x200 dtparam=3Daudio=3Don,i2c_arm=3Don,spi=3Don dtoverlay=3Dmmc dtoverlay=3Dpwm dtoverlay=3Dpi3-disable-bt device_tree_address=3D0x4000 kernel=3Du-boot.bin Aside from the VideoCore elfs, the overlays referenced in config.txt, bcm27= 10-rpi-3-b.dtb, and the PSCI Monitor I build everything from source and cop= y the remaining DTBs from the FreeBSD build. I also configure U-Boot with O= F_EMBED=3Dn and OF_BOARD=3Dy. OF_EMBED=3Dn tells U-Boot not to embed a Devi= ce Tree into the image and OF_BOARD=3Dy tells U-Boot to grab the Device Tre= e from the board itself (if supported). I don't know enough about Device Tr= ees to determine where it's actually getting FDT from or where the definiti= on for the clock is. - James Shuriff -----Original Message----- From: owner-freebsd-arm@freebsd.org <owner-freebsd-arm@freebsd.org> On Beha= lf Of Per Hedeland Sent: Tuesday, November 26, 2019 7:18 PM To: freebsd-arm@freebsd.org Subject: Re: rpi3 clock drift On 2019-11-27 00:17, Stefan Parvu wrote: > >> >> Can someone else with an rpi3 (which keeps good time) confirm that >> that's the usual number? > > > this is slightly different model: rpi3+ . I think it does use a different= SOC than rpi3. > > krmx@k1:~ % 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.alloweddeviation: 5 > 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: 3645432288 > kern.timecounter.tc.ARM MPCore Timecounter.mask: 4294967295 The same on what is a 3B w/o '+' AFAIR, keeping very good time: pi3 2> 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.alloweddeviation: 5 kern.timecounter.stepwarnings: 0 kern.timecounter.tc.ARM MPCore Timecounter.quality: 1000 kern.timecounter.t= c.ARM MPCore Timecounter.frequency: 19200000 kern.timecounter.tc.ARM MPCore= Timecounter.counter: 27058350 kern.timecounter.tc.ARM MPCore Timecounter.m= ask: 4294967295 and pi3 3> cat /var/db/ntp/ntpd.drift -5.333 pi3 4> uname -a FreeBSD pi3.hedeland.org 12.0-STABLE FreeBSD 12.0-STABLE r345358 GENERIC a= rm64 --Per Hedeland _______________________________________________ freebsd-arm@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-arm To unsubscribe, send any mail to "freebsd-arm-unsubscribe@freebsd.org" ________________________________ DISCLAIMER: This message and any attachments are intended solely for the u= se of the recipient and may contain confidential information. If you have r= eceived this message in error please delete it and promptly notify the send= er, James Shuriff (james@opentech.cc<mailto:james@opentech.cc>). --_002_MWHPR06MB3134F4C5A908D5123AFC23F0AA440MWHPR06MB3134namp_ Content-Type: text/plain; name="sdboot.txt" Content-Description: sdboot.txt Content-Disposition: attachment; filename="sdboot.txt"; size=2294; creation-date="Wed, 27 Nov 2019 08:24:50 GMT"; modification-date="Wed, 27 Nov 2019 08:24:50 GMT" Content-Transfer-Encoding: base64 Iy9iaW4vdGNzaAoKaWYgKGB1bmFtZSAtbWAgPT0gYXJtNjQpIHRoZW4KIHNldCBCT09URlM9L2Jv b3QvZmlybXdhcmUvCgogc2V0IFVFRklfTE9BREVSX1BBVEggPSAvYm9vdC9sb2FkZXJfbHVhLmVm aQogc2V0IERUQl9BV19QQVRIPS9ib290L2R0Yi9hbGx3aW5uZXIvCiBzZXQgRFRCX09MX1BBVEg9 L2Jvb3QvZHRiL292ZXJsYXlzLwplbHNlCiBzZXQgQk9PVEZTPS9tbnQvYm9vdGZzLwoKIHNldCBN QUtFT0JKRElSUFJFRklYPS91c3Ivb2JqCiBzZXQgU1JDRElSPSIvdXNyL3NyYy5oZWFkIgogc2V0 IEtFUk5DT05GPU9UQ0MKCiBzZXQgVUVGSV9MT0FERVJfUEFUSCA9ICRNQUtFT0JKRElSUFJFRklY LyRTUkNESVIvYXJtNjQuYWFyY2g2NC9zdGFuZC9lZmkvbG9hZGVyX2x1YS9sb2FkZXJfbHVhLmVm aQogc2V0IERUQl9BV19QQVRIPSRNQUtFT0JKRElSUFJFRklYLyRTUkNESVIvYXJtNjQuYWFyY2g2 NC9zeXMvJEtFUk5DT05GL21vZHVsZXMvJFNSQ0RJUi9zeXMvbW9kdWxlcy9kdGIvYWxsd2lubmVy Lwogc2V0IERUQl9PTF9QQVRIPSRNQUtFT0JKRElSUFJFRklYLyRTUkNESVIvYXJtNjQuYWFyY2g2 NC9zeXMvJEtFUk5DT05GL21vZHVsZXMvJFNSQ0RJUi9zeXMvbW9kdWxlcy9kdGIvYWxsd2lubmVy LwplbmRpZgoKc2V0IEZJUk1XQVJFX1JFUE9fUEFUSCA9IC9yb290L3JwaS9maXJtd2FyZS9ib290 LwpzZXQgVUJPT1RfQklOX1BBVEg9L3Jvb3Qvc3JjL3UtYm9vdC91LWJvb3QuYmluCnNldCBQU0NJ X01PTl9QQVRIID0gL3Jvb3QvcnBpL3JwaTMtcHNjaS1tb25pdG9yL2FybXN0dWI4LmJpbgpzZXQg RklSTVdBUkVfQ09ORklHX1BBVEggPSAvdXNyL3BvcnRzL3N5c3V0aWxzL3JwaS1maXJtd2FyZS9m aWxlcy9jb25maWdfcnBpMy50eHQKCiMgRW5kIG9mIENvbmZpZwoKc2V0IERUQl9BV19GSUxFUyA9 IChzdW41MGktYTY0LW5hbm9waS1hNjQuZHRiIHN1bjUwaS1hNjQtb2xpbnV4aW5vLmR0YiBzdW41 MGktYTY0LXBpbmU2NC1wbHVzLmR0YiBzdW41MGktYTY0LXBpbmU2NC5kdGIgc3VuNTBpLWE2NC1z b3BpbmUtYmFzZWJvYXJkLmR0YiBzdW41MGktaDUtb3JhbmdlcGktcGMyLmR0YikKc2V0IERUQl9P TF9GSUxFUyA9IChzdW41MGktYTY0LXNpZC5kdGJvIHN1bjUwaS1hNjQtdGhzLmR0Ym8gc3VuNTBp LWE2NC10aW1lci5kdGJvKQoKc2V0IEZJUk1XQVJFX1JFUE9fRklMRVMgPSAoTElDRU5DRS5icm9h ZGNvbSBib290Y29kZS5iaW4gZml4dXAuZGF0IGZpeHVwX2NkLmRhdCBmaXh1cF9kYi5kYXQgZml4 dXBfeC5kYXQgc3RhcnQuZWxmIHN0YXJ0X2NkLmVsZiBzdGFydF9kYi5lbGYgc3RhcnRfeC5lbGYg YmNtMjcxMC1ycGktMy1iLmR0YikKI3NldCBGSVJNV0FSRV9DVVNUT01fRklMRVMgPSAoL3Jvb3Qv cnBpL2JjbTI3MTAtcnBpLTMtYi5kdGIpCgojIGkyYy1ydGMgaXMgZm9yIG9wdGlvbmFsIEkyQyBS VEMuIENvbmZpZy50eHQgbXVzdCBiZSBtb2RpZmllZCB0byBzdXBwb3J0IGl0LgpzZXQgRklSTVdB UkVfT0xfUEFUSCA9ICRGSVJNV0FSRV9SRVBPX1BBVEgvb3ZlcmxheXMKc2V0IEZJUk1XQVJFX09M X0ZJTEVTID0gKG1tYy5kdGJvIHBpMy1kaXNhYmxlLWJ0LmR0Ym8gcHdtLmR0Ym8gaTJjLXJ0Yy5k dGJvKQoKIyAvCmZvcmVhY2ggeCAoJEZJUk1XQVJFX1JFUE9fRklMRVMpCgljcCAkRklSTVdBUkVf UkVQT19QQVRILyR4ICRCT09URlMKZW5kCiNmb3JlYWNoIHggKCRGSVJNV0FSRV9DVVNUT01fRklM RVMpCiMJY3AgJEZJUk1XQVJFX0NVU1RPTV9GSUxFUyAkQk9PVEZTCiNlbmQKY3AgJFBTQ0lfTU9O X1BBVEggJFVCT09UX0JJTl9QQVRIICRCT09URlMKY3AgJEZJUk1XQVJFX0NPTkZJR19QQVRIICRC T09URlMvY29uZmlnLnR4dAoKIyAvb3ZlcmxheXMKbWtkaXIgLXAgJEJPT1RGUy9vdmVybGF5cwpm b3JlYWNoIHggKCRGSVJNV0FSRV9PTF9GSUxFUykKCWNwICRGSVJNV0FSRV9PTF9QQVRILyR4ICRC T09URlMvb3ZlcmxheXMvCmVuZAoKIyBEVEIKbWtkaXIgLXAgJEJPT1RGUy9kdGIvYWxsd2lubmVy ICRCT09URlMvZHRiL292ZXJsYXlzCmZvcmVhY2ggeCAoJERUQl9BV19GSUxFUykKCWNwICREVEJf QVdfUEFUSC8keCAkQk9PVEZTL2R0Yi9hbGx3aW5uZXIvCmVuZApmb3JlYWNoIHggKCREVEJfT0xf RklMRVMpCgljcCAkRFRCX09MX1BBVEgvJHggJEJPT1RGUy9kdGIvb3ZlcmxheXMvCmVuZAoKIyBF RkkKIyBsb2FkZXJfbHVhLmVmaSBpcyBhIGhhcmQgbGluayB3aXRoIGxvYWRlci5lZmkKbWtkaXIg LXAgJEJPT1RGUy9FRkkvQk9PVApjcCAkVUVGSV9MT0FERVJfUEFUSCAkQk9PVEZTL0VGSS9CT09U L2Jvb3RhYTY0LmVmaQo= --_002_MWHPR06MB3134F4C5A908D5123AFC23F0AA440MWHPR06MB3134namp_--
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