updates build system to support selection of Target memory, includes trace buffer

port/moonlight/lds/memory_map.ld

@@ -2,6 +2,7 @@ MEMORY
 {
   rom   (rxai!w) : ORIGIN = 0x10080000, LENGTH = 8k
   flash (rxai!w) : ORIGIN = 0x20000000, LENGTH = 16M
-  ram   (wxa!ri) : ORIGIN = 0x30000000, LENGTH = 128K
+  ram   (wxa!ri) : ORIGIN = 0x30000000, LENGTH = 256K
+  trace (wxa!ri) : ORIGIN = 0x31000000, LENGTH = 1M
   dram  (wxa!ri) : ORIGIN = 0x40000000, LENGTH = 1024M
 }

port/moonlight/lds/sections.ld

@@ -105,5 +105,13 @@ SECTIONS
   PROVIDE( tohost = . );
   PROVIDE( fromhost = . + 8 );
 
+  .trace_buffer (NOLOAD) :
+  {
+    . =  ORIGIN(trace);
+    __trace_buffer_start = .;
+    . = ORIGIN(trace) + LENGTH(trace);  /* pad until end of trace */
+    __trace_buffer_end = .;
+  } > trace
+
   /DISCARD/ : { *(.eh_frame*) *(.comment) *(.note .note.*) }
 }