What is the method for debugging Linux serial port drivers?

The Linux serial port driver can be debugged using the following methods:

1. Use debugging tools: Debugging tools such as GDB (GNU Debugger) can be used to debug driver programs. By inserting breakpoints in the driver code, the program can be paused at runtime to observe variable values, execution flow, etc. Commands in GDB can be used to step through the code, set breakpoints, print variable values, and more.
2. Add debugging information: Incorporate debugging information into the driver code, such as printing the values of key variables and function call details. This can be achieved by using the printk function to print information in the kernel log, or the trace_printk function to print information in the kernel trace buffer.
3. Printing via serial port: By using the serial port for printing in the driver code, debug information can be viewed in real-time on the serial terminal. One can connect a serial debugging tool to the target device’s serial interface, and then use functions similar to printk in the driver code to print debug information to the serial port.
4. When using hardware debugging tools such as logic analyzers and oscilloscopes, one can observe and analyze the waveform of serial communication signals, as well as monitor the execution of driver programs. These tools can be used to check if the serial communication signals are correct and if the baud rate is matched.

These are some common debugging methods that can be used to debug Linux serial port drivers based on specific situations.