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/ rtc-ds3231-ubuntu-19.10-rpi4.txt
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June 27, 2021 05:05
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High Accuracy Pi RTC (DS3231) installation in Ubuntu 19.10 in Raspberry Pi 4 Model B Rev 1.1
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| Base instructions are here: | |
| http://wiki.seeedstudio.com/High_Accuracy_Pi_RTC-DS3231/ | |
| But I've diverted my setup procedure somewhat because Ubuntu boot setup is different than Raspbian and setup does some things not needed. | |
| To use RTC early in the boot add "fixrtc" to kernel boot command line. Correct file is "/boot/firmware/nobtcmd.txt". | |
| This is implemented in "/usr/share/initramfs-tools/scripts/local-premount/fixrtc". |