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Tiny Core not booting on some pi3a+

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SteveatXitek:
We have been using pi3a+'s with Tiny core for a while now but have a collection of pi3a+ that wont boot Tiny Core (keeps rebooting before anything reaches the monitor) so presumably the copy to ram is failing. The pi3a+'s boot Raspian fine. We have tried different cards / speeds and sizes . We have use some 300 pi3a+'s and have 20 that exhibit this issue. Any idea's as to whats going on / fix?
Steve

Paul_123:
Do you even see the rainbow screen?   But sounds like a weak power supply.

Tinycore runs the CPU in performance mode through the entire boot process(after boot, it drops back to powersave governor), which will tax a poor power supply.

Rich:
Hi SteveatXitek
Welcome to the forum.


--- Quote from: SteveatXitek on August 01, 2025, 06:39:27 AM --- ... We have use some 300 pi3a+'s and have 20 that exhibit this issue. ...
--- End quote ---
Just to be clear, are those 300 pi3a+'s all running the same version of Tinycore, and
20 of them are stuck in this reboot loop?

That would suggest something is different about those 20 units:
different firmware
different chip part numbers on those boards
different chip part manufacturers on those boards
boards purchased from a different vendor
power supplies for those boards are not up to snuff
etc.

gadget42:
and to add to @Rich's list would be to acknowledge counterfeit components(yes, including the board-level stuff that takes magnification to even visually inspect)...sigh...

SteveatXitek:
Ref PI3A+sourcing : we purchased in two batches of 150 from the same supplier (Farnell)
Ref PSU : does the same running from a 30A bench PSU
reboots without displaying anything
all using the same iso for flashing the cards and the cards are 8gb all from same batch (have tried swapping and using high speed cards also on the "failing" Pi3a+
All these "failing" boards will fully boot and run the latest full Raspian desktop with wifi enabled an internet active
and its just 20 out of the 300 Pi3a+'s
Tried everything We can think of here, any further ideas?

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