There are number of changes not applied:
-Change baud rate from 400 to 100kHz
-removal of "__attribute__((used))" in:
 -test_master/atmel_start_prj/hal/utils/src/utils_syscalls.c
 -test_master/atmel_start_prj/samd21a/gcc/gcc/startup_samd21.c
-enabling interrupt for I2c (Enable Address Match and PREC)
-update of linker file test_master/atmel_start_prj/samd21a/gcc/gcc/samd21g18a_flash.ld
Signed-off-by: Adam Wujek <dev_public@wujek.eu>