RTEMS | bsps/mips/jmr3904: No free running counter and no timecounter (#5690)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5690



The BSP has no CPU counter of its own and no timecounter below the resolution of
the clock tick. The uptime therefore advances once per tick, and a test which
needs a time point inside a tick cannot work. `T_interrupt_test()` places its
action a quarter of a tick before the tick it wants the interrupt in, so the
interrupt critical tests run into their iteration limit. The CPU counter also
sits in the CPU port, where a BSP cannot replace it.

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

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5690
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