Issue created by Sebastian Huber: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5799



`BSP_poll_char` references `BSP_inch()`, which waits until a character arrives. 
 The function has to return -1 if no character is available.  `getchark()` thus 
blocks while no input is available.  `ts-validation-io-kernel` stops after its 
first output until the test runner ends it with a timeout.

Found while running the full test suite on Qemu.  This description was created 
with Claude Code assistance.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5799
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