Linux: Default SPI driver set to SPIDEV (#847)

MySensors.h

@@ -334,10 +334,6 @@ MY_DEFAULT_RX_LED_PIN in your sketch instead to enable LEDs
 
 // Transport drivers
 #if defined(MY_RADIO_RF24)
-#if defined(__linux__) && !(defined(LINUX_SPI_BCM) || defined(LINUX_SPI_SPIDEV))
-#error No support for nRF24 radio on this platform
-#endif
-
 #if defined(MY_RF24_ENABLE_ENCRYPTION)
 #include "drivers/AES/AES.cpp"
 #endif

configure

@@ -510,12 +510,16 @@ if [ -z "${SPI_DRIVER}" ]; then
     if [ -n "${SPI_DRIVER}" ]; then
         echo "  [OK] SPI driver detected:${SPI_DRIVER}."
     else
-        echo "  [WARNING] No supported SPI driver detected."
+        echo "  [WARNING] No supported SPI driver detected. Using SPIDEV."
+        SPI_DRIVER=SPIDEV
     fi
 fi
 if [ -n "${SPI_DRIVER}" ]; then
     case ${SPI_DRIVER} in
         BCM)
+            if [[ $SOC != "BCM2835" && $SOC != "BCM2836" && $SOC != "BCM2837" ]]; then
+                die "BCM SPI driver is only supported for SOCs BCM2835, BCM2836 or BCM2837" 5
+            fi
             CPPFLAGS="-DLINUX_SPI_BCM $CPPFLAGS"
             ;;
         SPIDEV)

drivers/RFM69/new/RFM69_new.h

@@ -125,7 +125,7 @@ SoftSPI<MY_SOFT_SPI_MISO_PIN, MY_SOFT_SPI_MOSI_PIN, MY_SOFT_SPI_SCK_PIN, RFM69_S
 #define _SPI SPI
 #endif
 #else
-#if defined(__arm__)
+#if defined(__arm__) || defined(__linux__)
 #include <SPI.h>
 #else
 extern HardwareSPI SPI;		//!< SPI

drivers/RFM95/RFM95.h

@@ -120,7 +120,7 @@ _SPI;
 #define _SPI SPI					//!< SPI
 #endif
 #else
-#if defined(__arm__)
+#if defined(__arm__) || defined(__linux__)
 #include <SPI.h>
 #else
 extern HardwareSPI SPI;				//!< SPI