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my %rpi_v2_gpio_p1 = (
    SPI_CLK  => Device::BCM2835::RPI_V2_GPIO_P1_03,
...
    SPI_MISO  => Device::BCM2835::RPI_V2_GPIO_P1_07,
    ...,
);

... globals.h:
#define PIN_RTC_IRQ 2
...

... alarms.cpp:
attachInterrupt(digitalPinToInterrupt(PIN_RTC_IRQ), RTCIRQ, FALLING);

#if RADIODUINO_BOARD_REVISION < 4
#define PIN_RTC_IRQ 2
#else
#define PIN_RTC_IRQ 3
#endif

$ fgrep PIN_RTC_IRQ *
alarms.cpp:    attachInterrupt(digitalPinToInterrupt(PIN_RTC_IRQ), RTC
+IRQ, FALLING);
Firmware.ino:    pinMode(PIN_RTC_IRQ, INPUT_PULLUP);
Firmware.ino:    pinMode(PIN_RTC_IRQ, INPUT);
globals.h:#define PIN_RTC_IRQ 2