For a long time there has been this annoying set of warnings
when building Adafruit_BBIO:
overlays/ADAFRUIT-SPI0-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@0 has a unit name, but no reg property
overlays/ADAFRUIT-SPI0-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@1 has a unit name, but no reg property
overlays/ADAFRUIT-SPI1-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@0 has a unit name, but no reg property
overlays/ADAFRUIT-SPI1-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@1 has a unit name, but no reg property
overlays/ADAFRUIT-UART1-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@0 has a unit name, but no reg property
overlays/ADAFRUIT-UART1-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@1 has a unit name, but no reg property
overlays/ADAFRUIT-UART2-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@0 has a unit name, but no reg property
overlays/ADAFRUIT-UART2-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@1 has a unit name, but no reg property
overlays/ADAFRUIT-UART4-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@0 has a unit name, but no reg property
overlays/ADAFRUIT-UART4-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@1 has a unit name, but no reg property
overlays/ADAFRUIT-UART5-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@0 has a unit name, but no reg property
overlays/ADAFRUIT-UART5-00A0.dtbo: Warning (unit_address_vs_reg): Node /fragment@1 has a unit name, but no reg property
I noticed that installing bb.org-overlays does not generate
these warnings despite having similar device tree syntax:
https://github.com/beagleboard/bb.org-overlays/blob/master/Makefile#L35
I decided to go with Robert Nelson's judgement and add the flag
to avoid the dtc warning when building Adafruit_BBIO.
