98563a4afa14923bbc5d1b6245d401431a0ec709
- if debugging on serial console is enabled typing Q kills the system. It is handy if the system gets locked up and the timer interrupts still work. Good for remote debugging. - NOT_REACHABLE reintroduced and fixed. It should be used for marking code which is not reachable because the previous code _should_ not return. Such places are not always obvious
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