Hello Sasha, adding Matthias Brugger on Cc as he is the maintainer for Raspberry Pi.
On Thu, 2020-04-16 at 20:25 +0000, Jevtic, Sasha wrote: > 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. If you have know which older version still worked, you can use git-bisect [1] to find out where the regression was introduced. Ideally, if you can automate installation of a newly built U-Boot version, this can run entirely unattended to find out where the bug was introduced. [1]: https://git-scm.com/docs/git-bisect > 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 -- Harald
