> I don't have serial attached

I should have mentioned: eia0 (console=0) is the debug uart, for which you
need a special JST connector; eia1 ( console=1) is the uart on pins 14-15.
On the pi4 with the latest kernel, eia0 is the mini-uart on pins 14-15:
eia1 is the pl011 also on pins 14-15 (don' t try to use both at once!).

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