Modifications to common parameters functionality and main README file.

README

@@ -86,9 +86,12 @@ General format: ./<executable> [-p <platform> -d <device> | -t <type> --] [app-s
     <device>    :integer ID of device in <platform> to use
     <type>	: device type to use (0:CPU, 1:GPU, 2:MIC, 3:FPGA)
 
-Example1: ./astar -p 0 -d 0 --
-Example2: ./astar -t 0 --
+Example1: ./astar -p 0 -d 0 -- (selects device with device ID 0 on platform with platform ID 0)
+Example2: ./astar -t 0 -- (selects CPU device type on default platform with platform ID 0, if available)
 
+Notes:	If no parameters are supplied, default platform ID is 0 and default device type is CPU.
+	If -t parameter is given, default platform ID 0 is searched for supplied device type <type>. If not available, CPU device type selection will be attempted. 
+	If device ID is unknown, a combination of -p and -t is available to search for device of selected <type> on platform ID <platform>.	
 
 Acknowledgements
 ----------------

include/common_args.c

@@ -1,6 +1,6 @@
 #include "common_args.h"
 
-ocd_options _settings = {0, -1, -1};
+ocd_options _settings = {0, -1, 0};
 ocd_requirements _requirements = {0,0,0};
 option* _options = NULL;
 
@@ -136,7 +136,7 @@ cl_device_id _ocd_get_device(int platform, int device, cl_int dev_type)
 		err = clGetDeviceIDs(platforms[platform], dev_type, 0, NULL, &nDevices);
 		if(err == CL_DEVICE_NOT_FOUND)
 		{
-			fprintf(stderr,"No Supported Device Found of Type %d. Falling back to CPU.\n",dev_type);
+			fprintf(stderr,"No supported device of requested type found. Falling back to CPU.\n");
 			dev_type = CL_DEVICE_TYPE_CPU;
 			err = clGetDeviceIDs(platforms[platform], dev_type, 0, NULL, &nDevices);
 			if(err == CL_DEVICE_NOT_FOUND){