[riot-notifications] [RIOT-OS/RIOT] sys/stdio_uart: Add warning about use in ISR (#13985)

Gunar Schorcht notifications at github.com
Sun May 3 18:58:54 CEST 2020

> IMO debugging alone makes stdio from ISR an important use case.

Hm, I had to learn that the `stdio` doesn't work at all in ISRs if the newlib uses real locking functions instead of dummy locking functions.

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