Issue with uart-pipe on RT1060-EVK

[ofirshe]

I have configured LPUART3 on the RT1060-EVK as uart-pipe, with flow control enabled as specified in the DTS. This is connected to my VM’s virtual serial port (/dev/ttyS2). Sanity checks for data transmission in both directions were successful: data sent from the RT1060 to the VM using uart_pipe_send() and from the VM to the RT1060 using echo was received correctly.

This is how I've configured /dev/ttyS2:
sudo stty -F /dev/ttyS2 115200 cs8 -cstopb -parenb -crtscts ixon ixoff

However, after configuring the port on my Linux VM for SLIP communication, I encountered issues while sending a ping. Many bytes from the ICMP packet are lost, and the UART pipe becomes unresponsive. Specifically, the uart_pipe_rx() function in uart_pipe.c is no longer invoked when sending data from the VM to the RT1060. This behavior suggests that interrupts are being delivered from the UART but are no longer processed as expected.

Could you provide any guidance on debugging this issue or suggestions for resolving it?

[ofirshe]

I’m observing something strange with the UART device: when sending a single byte, the uart_pipe_rx function is called twice, and it retrieves the same byte from the FIFO twice instead of just once. What could be causing this?