Hello all,
I am encountering considerable difficulty with the networking functionality on
Raspberry Pi 4 on the latest release (2020.04). In particular, I have observed:
* any network operation that fails renders networking functionality
inoperable until reboot.
* ping always fails.
* TFTP download attempt of non-existent file fails (resulting in subsequent
network operations failing).
* TFTP download of an existing file usually works, but occasionally
experiences timeouts during transfers; some are timeouts are intermittent (the
transfer ultimately resumes), and some are permanent.
* TFTP download of a script usually works (as above). The script will run,
but any additional TFTP downloads performed by a script all fail.
It is not entirely clear right now whether this is a problem in U-Boot (i.e.,
instead of in the execution environment set up by the Raspberry Pi firmware),
but the TFTP infrastructure I am using is known to work well with other
hardware running an older version of U-Boot. Also, there are also no network
issues in the Linux environment that I ultimately boot, so hardware also seems
unlikely. Thus, suggestions for things to check would be appreciated; I am of
course also happy to provide any supporting data required to investigate.
Please also be aware that I initially posted a very similar inquiry to the
Raspberry Pi Forum:
https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=271068
Thanks.
Sasha
