ulp: add build system integration and example

components/ulp/ld/esp32.ulp.ld

@@ -0,0 +1,35 @@
+#include "sdkconfig.h"
+
+#define ULP_BIN_MAGIC		0x00706c75
+#define HEADER_SIZE			12
+MEMORY
+{
+    ram(RW) : ORIGIN = 0, LENGTH = CONFIG_ULP_COPROC_RESERVE_MEM
+}
+
+SECTIONS
+{
+    .text : AT(HEADER_SIZE)
+    {
+        *(.text)
+    } >ram
+    .data :
+    {
+        . = ALIGN(4);
+        *(.data)
+    } >ram
+    .bss :
+    {
+        . = ALIGN(4);
+        *(.bss)
+    } >ram
+    
+    .header : AT(0)
+    {
+        LONG(ULP_BIN_MAGIC)
+        SHORT(LOADADDR(.text)) 
+        SHORT(SIZEOF(.text))
+        SHORT(SIZEOF(.data))
+        SHORT(SIZEOF(.bss))
+    }
+}