There have been tons of format-string related bugs in our code which
we never discovered due to disabling -Wformat. Let's fix that.
Change-Id: I5ec466361bcc526fac1f4897673264ee5af3458b
The default ISR (particularly the HardFault handler) print information,
but this information was not displayed on the console because the UART
IRQ is lower than some default blocking IRQ.
Allowing to set synchronous transfer corrects this.
The underlying Atmel exception library had to be modified to use the
synchronous output.
Making UART_PutChar always synchronous when called from an ISR is not
desired because we use TRACE_ macros is some ISR. The synchronous
output must be set explicitly.
Change-Id: I1b4ace5185cf2dc32684934ed12bf6a8682e9bad
