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Posted

Armbian_21.05.1_Nanopiduo_focal_current_5.10.34.img boots (updating via apt upgrade also causes it not to boot any more)
Armbian_21.08.1_Nanopiduo_focal_current_5.10.60.img does not

 

When I examine the SD card it hasn't expended from image (makes sense since the heartbeat never starts).

Posted

OK, have FriendlyElec Matrix USB to TTL logging with working image. Let me try broken one and capture.

Posted

Damn thing booted Armbian_21.08.1_Nanopiduo_focal_current_5.10.60.img. Let me try this on the board I had an issue with and the same SD card. At least I know how to grab boot log now :)

Posted

OK, found root cause. I had a board wired up with all kinds of test devices, loopbacks, etc. My bad, sorry about that. I can fire up debug console now as a result. Still not sure why other version would boot though.

Posted

@WernerOK, I finally figured this out and it's not my wiring job :) What's happening is the Duo uses DRX pin (debug receive) for PWM, so if I wire up a LED it will not boot. If I remove that wire it will boot up. After it boots I can connect wire and it will work as expected, so something changed in Armbian_21.08.1_Nanopiduo_focal_current_5.10.60.img. I suspect that no one noticed this unless they were doing hardware PWM, I guess I need to disable serial console?

Posted

OK, so I tried console=none, the getty disable ttyS0 trick, etc. Most of the posts indicate you need to make a change and recompile the kernel. I don't have time for that, but for multi function pins this should work like it did in the previous releases.

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