Den 2021-01-13 kl. 15:07, skrev Chris Elvidge:
>
>  From the above reference:
>
> Note that 4-flashes may point to a defective SD-card holder, if one or
> more of the data contacts is intermittent it can lead to this problem.
>
> "No SD card" probably can't be differentiated from "Bad SD card holder"
> as no contact with SD card.


Well, yes, hmm how could I miss that?

the boot order is at
<https://www.raspberrypi.org/documentation/hardware/raspberrypi/bootmodes/bootf
low.md>

with a comment

"If there is no SD card inserted, the SD boot mode takes five seconds to
fail. To reduce this and fall back to USB more quickly, you can either
insert an SD card with nothing on it or use the GPIO bootmode OTP
setting described above to only enable USB."

So I halted, inserted a small empty one and boot and now no more
flashing. Thanks


--
Björn

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