make a bare nrf52840dk build which will work for everyone

boards/nrf52840_dk.json

@@ -0,0 +1,47 @@
+{
+    "build": {
+      "arduino": {
+        "ldscript": "nrf52840_s140_v6.ld"
+      },
+      "core": "nRF5",
+      "cpu": "cortex-m4",
+      "extra_flags": "-DARDUINO_NRF52840_PCA10056 -DNRF52840_XXAA",
+      "f_cpu": "64000000L",
+      "hwids": [["0x239A", "0x4404"]],
+      "usb_product": "nrf52840dk",
+      "mcu": "nrf52840",
+      "variant": "pca10056",
+      "variants_dir": "variants",
+      "bsp": {
+        "name": "adafruit"
+      },
+      "softdevice": {
+        "sd_flags": "-DS140",
+        "sd_name": "s140",
+        "sd_version": "6.1.1",
+        "sd_fwid": "0x00B6"
+      },
+      "bootloader": {
+        "settings_addr": "0xFF000"
+      }
+    },
+    "connectivity": ["bluetooth"],
+    "debug": {
+      "jlink_device": "nRF52840_xxAA",
+      "onboard_tools": ["jlink"],
+      "svd_path": "nrf52840.svd"
+    },
+    "frameworks": ["arduino"],
+    "name": "A modified NRF52840-DK devboard (Adafruit BSP)",
+    "upload": {
+      "maximum_ram_size": 248832,
+      "maximum_size": 815104,
+      "require_upload_port": true,
+      "speed": 115200,
+      "protocol": "jlink",
+      "protocols": ["jlink", "nrfjprog", "stlink"]
+    },
+    "url": "https://meshtastic.org/",
+    "vendor": "Nordic Semi"
+  }
+  

platformio.ini

@@ -168,6 +168,11 @@ debug_init_break =
 ; The NRF52840-dk development board
 [env:nrf52dk]
 extends = nrf52_base
+board = nrf52840_dk
+
+; The NRF52840-dk development board, but @geeksville's board - which has a busted oscilliator 
+[env:nrf52dk-geeksville]
+extends = nrf52_base
 board = nrf52840_dk_modified
 
 # For experimenting with RAM sizes

src/mesh/RadioInterface.h

@@ -161,6 +161,11 @@ class SimRadio : public RadioInterface
     /// Make sure the Driver is properly configured before calling init().
     /// \return true if initialisation succeeded.
     virtual bool init() { return true; }
+
+    /// Apply any radio provisioning changes
+    /// Make sure the Driver is properly configured before calling init().
+    /// \return true if initialisation succeeded.
+    virtual bool reconfigure() { return true; }
 };
 
 /// Debug printing for packets