My USB problem is the "won't start" kind, so the PHY isn't recognized or something, and it can work to simply reset the system at some point, but of course that isn't good for the state of Linux, so that isn't a nice idea. I didn't start sequencing the supply parts (should be possible with the extension board, where some supply enables could be driven buy external sequencing logic), nor did I try some form of reset delay, which probably should be a real fix, combined with possibly a kernel upgrade.
In short most of the times I started with this circuit:
the USB worked, but not exactly every time
.T.
Statistics: Posted by theover — Fri Aug 15, 2014 2:21 pm
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Regarding your comments about SD-card file errors at reboot:
I have has similar issues and have had to date to completely re-format and re-create boot and OS images on two of my four Parallella's cards. I also found that sometimes performing a fsck with the partitions mounted on another machine would work, but as you found a few times later the image was so messed up only a format and re-write from scratch would do.
Look forward to you posting more on your findings re: pulling power supply out of wall socket.
Regards
Ralph
Statistics: Posted by ralphmcardell — Thu Aug 14, 2014 5:06 pm
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