Hey folks, maybe you can help me. I got two RTCs and when I connect them to the DE10 I can set the time via hwclock -wu and then hwclock -u shows the correct time. I use CR1220 3V lithium batteries, facing the correct way, but when I turn the MiSTer off and remove the WiFi dongle before turning back on, then there is no time and hwclock -u shows an invalid argument.
Is there something I am missing and can I test if the RTC is powered correct? To me it looks like both RTCs I tried are not powered by the batteries and I tried multiple Maxell and Panasonic brand batteries.