1SAMD CORE 1.6.10
2
3* The linker script must define `__text_start__` symbol at the beginning of .text section.
4  This symbol is used to automatically determine the bootloader size.
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6SAMD CORE 1.6.6
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8* `digitalPinToInterrupt` #define moved to Arduino.h, variant.h must no longer define it.
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10SAMD CORE 1.6.3
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12* Timer for pin PWM selected based on value of `PIN_ATTR_TIMER_ALT` or `PIN_ATTR_TIMER`.
13  Prior to this "pin type" (ulPinType) was used.
14