Vxworks 5.4.2 Instant

#VxWorks #Embedded #RealTimeKernel

No MMU protection. No POSIX threads. But deterministic scheduling you could bet a Mars rover on. vxworks 5.4.2

If you ever debugged a priority inversion with wind in Tornado 2.2 – you have my respect. #VxWorks #Embedded #RealTimeKernel No MMU protection

#EmbeddedSystems #RTOS #VxWorks #LegacyCode Did you know? VxWorks 5.4.2 (and earlier) used the wind kernel – a single flat address space, ring 0 only. Every task could see and corrupt every other task’s memory. But you could hot-patch functions live in the shell with just: If you ever debugged a priority inversion with

Still running in some places where “if it ain’t broke, don’t update the BSP.”

-> ld < myPatch.o -> symFindByName "oldFunc", &pOld -> symFindByName "newFunc", &pNew -> pOld = pNew No reboot. No downtime. That’s power – and danger.

Who else here survived the 5.x era? Bonus points if you used and thought it was magic.