Hi Francesco, On Mon, Oct 3, 2022 at 8:08 AM Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx> wrote: > > Hello all, > recently I have been experiencing an issue with the imx uart on i.MX6ULL Does this also happen with other i.MX devices or only on i.MX6ULL? > SoC, on the tty console (no flow control, 1152008n1), chars after the 32nd > are lost when typing "fast" (copy/paste or writing to the uart using > automated tools). > > This was tested on Linux 6.0, however it does not look like a brand new > regression, kernel 5.4 was somehow subject to the same issue, although > it was way more difficult to trigger it. > > While I do understand that without flow control this is something that > cannot be prevented, it is pretty fishy that is always the chars after > the 32nd. > > I guess that might be happening is that the FIFO is emptied only by a > timer or when it is full, instead of emptying it when half-full, and the > CPU might not be fast enough leading to an overflow and the chars lost. > > Any idea? Can you share a reproducer?
