[epics] setup epics on radxa zero 3e with dietpi installed

[konosubakonoakua]

epoll issue (dietpi)

After I installed softioc, encounterd:

libevent Warn: epoll_wait: Function not implemented
2025-01-20T14:12:52.354942535 CRIT pvxs.loop Exit loop worker: -1 for 0xffffa8000c70

must add EVENT_NOEPOLL=1 before your command
or just insert the code below

import os
os.environ['EVENT_NOEPOLL'] = '1'

I have raised an issue in pvxs: epics-base/pvxs#96

[konosubakonoakua]

i2c issue

i2c3 on Pin 3/5 is not enabled by default.
BTW 0x22 is occupied by PD delivery chip

We need to use additional device tree overlays here(radxa-overlays action artifacts)
Or just use the file I have uploaded: linux-rk356x.zip

Then

cp ~/shared/rk3568-i2c3-m0.dtbo /boot/dtb-5.10.160-legacy-rk35xx/rockchip/

Then modify /boot/dietpiEnv.txt

overlay_path=rockchip
overlay_prefix=rk3568
overlays=i2c3-m0
user_overlays=