> From: Archimedes Gaviola <archimedes.gavi...@gmail.com> > Date: Mon, 24 Aug 2020 01:18:46 +0800 > > On Mon, Aug 24, 2020 at 1:10 AM Mark Kettenis <mark.kette...@xs4all.nl> > wrote: > > > From: Archimedes Gaviola <archimedes.gavi...@gmail.com> > > Date: Mon, 24 Aug 2020 01:04:23 +0800 > > > > On Sun, Aug 23, 2020 at 10:50 PM Mark Kettenis > <mark.kette...@xs4all.nl> > > wrote: > > > > > From: Archimedes Gaviola <archimedes.gavi...@gmail.com> > > > Date: Sun, 23 Aug 2020 22:36:49 +0800 > > > > > > Hi, > > > > > > Good day! > > > > > > How to enable DS3231 real-time clock in Raspberry Pi 4B? In > Raspberry > > Pi 3B > > > these 2 lines below in the config.txt works. > > > > > > dtparam=i2c_arm=on > > > dtoverlay=i2c-rtc,ds3231 > > > > > > and resolve the dmesg messages below. > > > > > > WARNING: clock lost 8 days > > > WARNING: CHECK AND RESET THE DATE! > > > > > > This system is not always connected to the Internet. > > > > I think only the dtoverlay line is needed. But yes, this works as > > long as the i2c-rtc overlay file is present in the overlays > > subdirectory of the firmware partition of your boot medium. > > > > Many of the other chip types supported by the i2c-rtc overlay are > > supported by OpenBSD as well. Feel free to send me any modules with > > unsupported chips, and I'll make them work. > > > > Cheers, > > > > Mark > > > > Hi Mark, > > > > Thanks for your prompt response! I tried it now by pulling-out dtbo > file here > > > > > > https://github.com/raspberrypi/firmware/blob/master/boot/overlays/i2c-rtc.dtbo > > > > > > > and put it in the overlays directory and then update the system time > and date > > to current using NTP via $ rdate ntp.pool.org and then reboot. The > system > > will still show up > > > > WARNING: clock lost 8 days > > WARNING: CHECK AND RESET THE DATE! > > Without showing the complete dmesg we can't help you. > > Hi Mark, > > Please see attached dmesg. > > Thanks and best regards, > Archimedes > > > openbsd67rpi4b# dmesg > OpenBSD 6.7-current (GENERIC.MP) #775: Wed Aug 19 00:17:01 MDT 2020 > dera...@arm64.openbsd.org:/usr/src/sys/arch/arm64/compile/GENERIC.MP > real mem = 1996668928 (1904MB) > avail mem = 1903022080 (1814MB) > random: good seed from bootblocks > mainbus0 at root: ACPI
You have to switch to DT (device tree) mode to be able to use the RTC. Cheers, Mark
