Or maybe something orphaned and not worth a thought. Allwinner rearranged business units and new BU5 is now responsible for 'R series'. So something known as A20E in the past became now R40 and moved from BU2 (tablets/VR) to 5.
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they dont orphan things, they reiterate, mix and match, and release as a new soc
but H3 and V3s is really new SoCs
(sun8iw7 and sun8iw8
oh seems that only I in this channel has V3s
please, can some one correct me. If i see it correctly, BROM on A20 will try to enable SD0 port and check for SD card on it. If it fails, it may configure it as JTAG.
i didn't tested my assumption jet
need to get sd sniffer first
at least on the other chips it will go to FEL after sd card
and for jtag you have to remux the pins yourself
beeble: BROM doing some automatix muxing
no need for manual remuxing
don't have a A20 so can't really confirm or deny. but on A31 i remember that it will not enable jtag if you are not doing it yourself. but can be different on the a20 and i don't have a a20 brom disassembly available
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but you could check it quite easy. boot to fel and check the port mux register