sdbfs for flash with FPGA bitstream file

tools/sdbfs/--SDB-CONFIG--

@@ -3,7 +3,7 @@
 # at offset zero at all, we want to start at zero *wihin* our space.
 # This is actually the default, but stating it is better.
 .
-	position = 0
+	position = 1507328
 
 # Then, we have a number of writable files. By default (i.e. no config)
 # all existing files are created as read-only files with current contents
@@ -11,6 +11,11 @@
 #
 # Allocation granularity is 64 bytes
 
+bitstream
+  write = 1
+  position = 0
+  maxsize = 1507328
+
 mac-address
 	write = 1
 	maxsize = 6