On Sunday 29 November 2020 17:46:05 Pali Rohár wrote:
With current implementation there is an issue in musb driver that it loose receiving bytes from USB bus when too many a characters are send over USB tty from computer. Typing on keyboard to kermit terminal connected to /dev/ttyACM0 is working fine. But pasting more more bytes to terminal cause data lost on receiving side. I do not know where is the issue or how to fix it (it looks like that data are lost at low level when reading them from msub FIFO hardware) but typing on keyboard is working fine. This is rather issue for sending files via x/y/z-modem or kermit protocol. Currently U-Boot is not able to receive any file via usbtty with musb driver due to this issue.
This musb issue is fixed in second patch series "usbtty/musb: Fix file transfers"