On 09.06.20 12:18, m...@schulzd.me wrote:
I tried a 12V 5A switch mode power supply - still no dice.
Be careful, the BBB takes 5V not 12V.
I even flashed it using this PSU, switched to USB to add WiFi
credentials, and then put it back to 12V and SSH'd in via WiFi. Still
has the same issue with read-only.
I really think it must be a hardware problem, I might go have a look at
the board gerbers/cad files and see if I can spot anything, perhaps it
could be something as benign as the eMMC/Wifi chips having being on the
same power plane (most likely I assume?), and when WiFi requires more
current during a transmission, it's unable to source enough, which could
cause voltage to drop or not enough current supplied to eMMC, which then
causes the error? This would be why adding a beefier PSU would help I
guess - but if for some reason the traces are really thin or something,
or not enough vias or not not enough shielding... who knows :-)
I guess the absolute very last thing you could try, would be clearing
the eMMC and re-writing bootloader and everything from scratch - but
what's the point? This issue *ALSO* happens when I'm booted to the SD
card - so to me that seems like it's something with the WiFI chip
causing havoc in other parts of the board (maybe RAM/CPU ??)
Thanks for the help anyway guys!
Strange, I've poked one BBB Wireless a few years ago and I don't recall
such issues.
I vaguely recall the eMMC flaking out on regular BBB-s when I powered
them from a bad power supply and supplied a full 3G GSM modem directly
from its USB (which was simply a bad idea and far exceeded the specs of
the USB supply on BBB).
--
Tarmo
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