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XDS110 on CC13x0 launchpads does not transport UART messages longer than 128 bytes on Linux hosts

Rick8472
Prodigy 20 points

Hello,

I want to report a bug related to the XDS110 debugger on a CC13x0 launchpad when using a Linux host.

Steps to reproduce:

  1. Connect a CC13x0 launchpad to a Linux host (I am using Ubuntu 20.04 with kernel version 5.4.0). No need to flash any application to the board.
  2. Connect a logic analyzer to the RxD pin on the launchpad to intercept UART traffic from the host to the MCU
  3. Send a very long message (for instance 300 bytes) via the terminal to the pseudo TTY device (/dev/ttyACMx)
  4. Observe that the XDS110 never outputs more than 128 bytes, sometimes 192 bytes

The problem does not happen on Windows and it does not happen on CC13x2 launchpads. All tested launchpads had XDS110 firmware 3.0.0.15. Since I don't see the problem on CC13x2/CC26x2 launchpads, I don't suspect a problem in the Linux kernel driver, but an issue in the XDS110 firmware.

Would you be able to confirm that and to file a bug report to the XDS team? I have already tried to explain that issue in this thread. 

Thanks.