acassis opened a new issue, #6575:
URL: https://github.com/apache/incubator-nuttx/issues/6575

   I decided to help Ed to fix to USB issue #6531 and decided to test the USB 
on STM32F4Discovery board.
   
   Unfortunately version 10.3.0, didn't work, then I decided to test 10.2.0, 
also didn't work, version 10.0.0 shows the "nsh>" but doesn't work and display 
the message: "nsh: nsh_session: readline failed: 9"
   
   The only working version was 9.1.1! It means it was working around Dec 2020, 
but stopped to work some time later.
   
   Once again we need to find a way to automatically test these boards, 
unfortunately only getting a board passing on CI test is not enough.
   
   These are the step to duplicate the issue
   ```
   $ ./tools/configure.sh stm32f4discovery:usbnsh
   $ make
   1) Flash the firmware in the board
   2) Connect a Micro USB cable to CN5 connector
   3) It will create a /dev/ttyACM0 on your computer, then configure minicom to 
use this /dev/ttyACM0 port
   4) On minicom press ENTER 3 times, the "nsh>" will not show up
   ```


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