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BF536 hangs on reboot after flash operation

Question asked by jon_harris8 on Jun 28, 2016
Latest reply on Aug 3, 2016 by Aaronwu

I have a problem where when I attempt to reboot a BF536, it hangs.  The last thing from the serial port printout is:

Restarting system.ý

(Several different single non-ASCII characters appear at the end of the message.)

This is very intermittent.  The most reliable way I have found to trigger it is with large flash writes just before the reboot.  I am using UBIFS with a fairly slow serial NOR flash.

When it hangs, if I physically short the reset line to ground, it reboots as expected.  The reboot is accomplished with the system reboot command, i.e.

system("reboot");  from C code or 'reboot' from the command line.

The test I've been using is to run 'tar' to extract about 100 uncompressed files from a 5 MB archive, call 'sync', wait a variable amount of time, then 'reboot'.  All this is being done by a shell script.  With little or no pause between sync and reboot, it fails fairly often, maybe 1 out of 10.  With a pause of 60 seconds, failure rates decrease, but still happen.

Any ideas on this one?