View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0006265 | fsimx_Linux | Kernel | public | 2024-05-28 12:03 | 2024-08-01 12:40 |
| Reporter | gerbach | Assigned To | |||
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | resolved | Resolution | fixed | ||
| Product Version | fsimx6-V3.1 | ||||
| Target Version | fsimx-next | Fixed in Version | fsimx8mp-Y2024.07 | ||
| Summary | 0006265: [ALL] It is not possible to read data from serial port when input buffer contains exactly 9 bytes. | ||||
| Description | The number 9 is related to the length of the rx_fifo_trig in drivers/tty/serial/imx.c. For kernel 5.4.70, it was possible to set this value to 1 in the device tree, but for kernel 5.15.148, this didn't work for me anymore. The new work-around was to disable dma using the "no-dma" setting in device tree. Anyway, this seems like a bug in the serial port implementation which should be fixed. https://forum.fs-net.de/index.php?thread/4870-cannot-read-serial-port-when-input-buffer-contains-exactly-9-bytes/#post16906 | ||||
| Steps To Reproduce | from serial import Serial with Serial('/dev/ttymxc2', baudrate=115200, timeout=1) as serial: request = b'a' * 9 serial.write(request) response = serial.read(9) assert request == response | ||||
| Forum Link | |||||
