stm32: add blues wireless swan

targets/stm32l4x5.ld

@@ -0,0 +1,10 @@
+
+MEMORY
+{
+  FLASH_TEXT (rx) : ORIGIN = 0x08000000, LENGTH = 2048K
+  RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 640K
+}
+
+_stack_size = 4K;
+
+INCLUDE "targets/arm.ld"

targets/swan.json

@@ -0,0 +1,13 @@
+{
+    "inherits": ["cortex-m4"],
+    "build-tags": ["swan", "stm32l4r5", "stm32l4x5", "stm32l4", "stm32"],
+    "serial": "uart",
+    "linkerscript": "targets/stm32l4x5.ld",
+    "extra-files": [
+      "src/device/stm32/stm32l4x5.s"
+    ],
+    "flash-method": "command",
+    "flash-command": "dfu-util --alt 0 --dfuse-address 0x08000000 --download {bin}",
+    "openocd-interface": "stlink",
+    "openocd-target": "stm32l4x"
+  }