Two outlying issues

Carlos has a prototype board not a production board which is why it is a little different. The EA chips are effectively the same as the DA chips as far as the Unmatched board is concerned.

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Yes, thank you @davidlt
i decompiled hifive-unmatched-a00.dtb of ubuntu 21.04 , found that it has no RTC infomation. just add rtc config you presented and recompile it to DTB will work.
BTW , refer to @drmpeg’s suggestion , add da9063_wdt to /etc/modules and remove it from blacklist .

now it work, just like @drmpeg’s experience, reboot will close computer .

what, i can really reboot now. but shutdown failed.

Just an update to this, my patch adding EA revision has been merged upstream.