RTEMS | bsps/powerpc/psim: The CPU counter frequency overflows (#5725)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5725



`_CPU_Counter_frequency()` returns `bsp_clicks_per_usec * 1000000`. The BSP
sets `bsp_clicks_per_usec` to `BSP_bus_frequency`, which it states in kHz, so
the product is 10^10 and does not fit in the `uint32_t` return type. The value
wraps to 1410065408.

The clock driver installs the same time base register as a timecounter of
10 MHz, so the two descriptions of one register disagree by a factor of 141.
`ttest01` compares a tick to time round trip and reads 1.099999999 where it
expects 1.100000000. `rtems_bsp_delay()` reads the same variable and spins 1000
times too long.

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

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5725
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