Add linking step

link.ld

@@ -0,0 +1,43 @@
+ENTRY(reset);
+
+MEMORY {
+  flash(rx)  : ORIGIN = 0x08000000, LENGTH = 512K
+  sram(rwx) : ORIGIN = 0x20000000, LENGTH = 128K
+}
+stack_start = ORIGIN(sram) + LENGTH(sram); /* stack points to end of sram */
+
+SECTIONS {
+  .isr_vector : {
+    . = ALIGN(4);
+    KEEP(*(.isr_vector))
+    . = ALIGN(4);
+  } > flash
+
+  .text : { /* code and constants */
+    . = ALIGN(4);
+    *(.text)
+    *(.text.*)
+    *(.rodata)
+    *(.rodata.*)
+    . = ALIGN(4);
+  } > flash
+
+  _data_addr = LOADADDR(.data);
+  .data : { /* intialized variables */
+    . = ALIGN(4);
+    _data_start = .;
+    *(.data)
+    *(.data.*)
+    . = ALIGN(4);
+    _data_end = .;
+  } > sram AT > flash /* loads the section into sram, with initial values stored in flash */
+
+  .bss : { /* unintialized variables */
+    . = ALIGN(4);
+    _bss_start = .;
+    *(.bss)
+    *(.bss.*)
+    _bss_end = .;
+    . = ALIGN(4);
+  } > sram
+}