trembel Posted March 29, 2023 Share Posted March 29, 2023 Hi, I'm trying to use an external RTC clock (https://www.hardkernel.com/shop/rtc-shield/, battery is good) connected over I2C to wakeup the Odroid HC4 from poweroff (or if not possible from disk-suspend). To my surprise the rtc was already recognised (and also the device tree seems good) and I'm able to communicate with it, read it and set alarms for it. However, whenever I poweroff the device and try to turn on again it does not power on by itself (neither from poweroff, nor from disk suspend). Output from /proc/driver/rtc: rtc_time : 19:16:28 rtc_date : 2023-03-29 alrm_time : 19:07:00 alrm_date : 2023-04-29 alarm_IRQ : no alrm_pending : no update IRQ enabled : no periodic IRQ enabled : no periodic IRQ frequency : 1 max user IRQ frequency : 64 24hr : yes When setting an alarm using (same result using rtcwake) echo `date '+%s' -d '+ 5 minutes'` | sudo tee /sys/class/rtc/rtc0/wakealarm which sets the RTC to the following: rtc_time : 19:18:17 rtc_date : 2023-03-29 alrm_time : 19:23:00 alrm_date : 2023-03-29 alarm_IRQ : yes alrm_pending : no update IRQ enabled : no periodic IRQ enabled : no periodic IRQ frequency : 1 max user IRQ frequency : 64 24hr : yes However, after power off (or suspend to disk), the Odroid HC4 does not turn on again.. After powercycling and the following boot, this is what /proc/driver/rtc looks like: rtc_time : 19:24:49 rtc_date : 2023-03-29 alrm_time : 19:23:00 alrm_date : 2023-04-29 alarm_IRQ : no alrm_pending : no update IRQ enabled : no periodic IRQ enabled : no periodic IRQ frequency : 1 max user IRQ frequency : 64 24hr : yes which somehow has a wrong alarm date and the alarm_IRQ is no, and no alarm is pending. The OS I'm using is the following: Linux odroidhc4two 6.1.11-meson64 #23.02.2 SMP PREEMPT Sat Feb 18 00:07:55 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux Armbian 23.02.2 Jammy with Linux 6.1.11-meson64 Would be nice if someone could help me.. Best, trembel 0 Quote Link to comment Share on other sites More sharing options...
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