Jacob Killelea created an issue: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5256



## Summary
The serial port does not appear to initialize properly on `arm/raspberrypi`. 
The first few printouts come through, but afterward a shell fails to start and 
most test programs crash:


Testing `fileio.exe` in QEMU for the Raspberry Pi 2/3:
```
*** BEGIN OF TEST FILE I/O ***
*** TEST VERSION: 7.0.0.a9cf40113a38e9c7f38df0bfd92f322ff5cb3914
*** TEST STATE: USER_INPUT
*** TEST BUILD: RTEMS_POSIX_API RTEMS_SMP
*** TEST TOOLS: 13.3.0 20240521 (RTEMS 7, RSB 
34507fe5b79c079017fdbafb4bac16bf8d538ac6, Newlib 1b3dcfd)

*** END OF TEST FILE I/O ***


[ RTEMS shutdown ]
CPU: 0
RTEMS version: 7.0.0.a9cf40113a38e9c7f38df0bfd92f322ff5cb3914
RTEMS tools: 13.3.0 20240521 (RTEMS 7, RSB 
34507fe5b79c079017fdbafb4bac16bf8d538ac6, Newlib 1b3dcfd)
executing thread ID: 0x0a010001
executing thread name: UI1

FATAL ERROR - Executive shutdown! Any key to reboot...
```

## Steps to reproduce
This bug exists in the latest development commits of RTEMS (`a9cf40113a`) and 
RSB (`34507fe`) 

### Pre-set options

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5256
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