gp2x update: updated docs, prevent clocking menu using illegal values and hardlock the device

gp2x/buttonmap.txt

@@ -33,4 +33,10 @@ SAVE GAME		SELECT + START
 MAIN MENU/PAUSE		START
 VOL-/+			IN-/DECREASE VOLUME
 
+
+MENU
+
+MAKE SELECTION		B
+CANCEL/PREVIOUS MENU	START
+
 				* DESCENT][ ONLY

gp2x/notes.txt

@@ -6,6 +6,7 @@ Install
 
 * Copy all the files from the archive to a directory of your SD card
 * Copy the files "descent.hog" and "descent.pig" from your Descent CD to this directory as well
+  (please note these files MUST be lowercase)
 * Run d1x-rebirth_cockpit or d1x-rebirth_fullscreen to run the game
 * See buttonmap.txt for a list of keys and combos
 

main/menu.c

@@ -1301,9 +1301,9 @@ void do_cpu_menu()
 
 	cpu_speed = modes[i];
 
-	printf("Set CPU Clock...(%i)\n",cpu_speed);
-	SetClock(cpu_speed);
-
-
+	if (cpu_speed >= 200 && cpu_speed <= 275) {
+		printf("Set CPU Clock...(%i)\n",cpu_speed);
+		SetClock(cpu_speed);
+	}
 }
 #endif