Add board files for nRF52840 Dongle (pca10059)

boards/nrf52840_dongle.json

@@ -0,0 +1,38 @@
+{
+  "build": {
+    "arduino": {
+      "ldscript": "nrf52840_dongle.ld"
+    },
+    "core": "nRF5",
+    "cpu": "cortex-m4",
+    "extra_flags": "-DARDUINO_NRF52840_PCA10059 -DNRF52840_XXAA",
+    "f_cpu": "64000000L",
+    "mcu": "nrf52840",
+    "variant": "pca10059",
+    "bsp": {
+      "name": "adafruit"
+    },
+    "softdevice": {
+      "sd_flags": "-DS140",
+      "sd_name": "s140",
+      "sd_version": "7.3.0",
+      "sd_fwid": "0x123"
+    }
+  },
+  "connectivity": [
+    "bluetooth"
+  ],
+  "frameworks": [
+    "arduino"
+  ],
+  "name": "NRF52840 Dongle",
+  "upload": {
+    "maximum_ram_size": 248832,
+    "maximum_size": 815104,
+    "require_upload_port": true,
+    "speed": 115200,
+    "protocol": "jlink"
+  },
+  "url": "https://os.mbed.com/platforms/Nordic-nRF52840-DK/",
+  "vendor": "Nordic"
+}

boards/nrf52840_dongle.ld

@@ -0,0 +1,39 @@
+/* Linker script to configure memory regions. */
+
+SEARCH_DIR(.)
+GROUP(-lgcc -lc -lnosys)
+
+MEMORY
+{
+  /* Leave space after 0x80000 for the DFU bootloader. */
+  FLASH (rx)     : ORIGIN = 0x27000, LENGTH = 0x87000 - 0x27000
+
+  /* SRAM required by Softdevice depend on
+   * - Attribute Table Size (Number of Services and Characteristics)
+   * - Vendor UUID count
+   * - Max ATT MTU
+   * - Concurrent connection peripheral + central + secure links
+   * - Event Len, HVN queue, Write CMD queue
+   */
+  RAM (rwx) :  ORIGIN = 0x20006000, LENGTH = 0x20040000 - 0x20006000
+}
+
+SECTIONS
+{
+  . = ALIGN(4);
+  .svc_data :
+  {
+    PROVIDE(__start_svc_data = .);
+    KEEP(*(.svc_data))
+    PROVIDE(__stop_svc_data = .);
+  } > RAM
+
+  .fs_data :
+  {
+    PROVIDE(__start_fs_data = .);
+    KEEP(*(.fs_data))
+    PROVIDE(__stop_fs_data = .);
+  } > RAM
+} INSERT AFTER .data;
+
+INCLUDE "nrf52_common.ld"