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! In Raspberry Pi 3B, it showed-up something "i2c at dsxrtc" in the dmesg. This time with Raspberry Pi 4B I had not seen any indicator. By the way, this is my RTC module https://shopee.ph/DS3231-Mini-RTC-Module-i.18252381.315148783. Thanks and best regards, Archimedes
