The code instantiates the SD object and mounts to /sd, which seems to work well usually. However after a soft-reset it hangs from time to time. I have added some logging messages to the code that is run (boot.py/main.py in https://github.com/zsquareplusc/wipy-environment) and it hangs when creating the SD object or mounting to /sd. When it hangs, it seems to be locked indefinitely.
I've seen that effect with original firmware as well as the one here:
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>>> os.uname() (sysname='WiPy', nodename='WiPy', release='1.1.0', version='v1.5-1-ge954604 on 2015-10-21', machine='WiPy with CC3200')