16c95x Serial Port Driver _verified_ Jun 2026

| Symptom | Likely Cause | Fix | |---------|--------------|-----| | Tx stops after first byte | THRE interrupt not re-enabled | Check start_tx() enables IER_THRI | | Rx overrun errors | Rx FIFO threshold too high | Lower TLR value or increase CPU responsiveness | | Spurious CTS/RTS changes | Auto flow control misconfigured | Verify EFR bits and MCR_AFE | | Baud rate off by factor 2 | Forgot DLAB=1 when setting divisor | Re-check initialization order |

: The driver is designed to be fully software-compatible with industry-standard 16C55x and 16C450 devices, ensuring older applications can still function. Industrial and Computing Applications 16c95x serial port driver

Further reading:

# Check FIFO size (should be 128) setserial -g /dev/ttyS0 | Symptom | Likely Cause | Fix |

Minimizing "overrun errors" during intense data transfers. Why You Need the Correct Driver 16c95x serial port driver