Add info about "setdevice" command.

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@825 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

jtag/doc/UrJTAG.txt

@@ -424,6 +424,7 @@ example usage.
 *register*:: 	define new data register for a part
 *script*:: 	run command sequence from external file
 *set*:: 	set external signal value
+*setdevice*::: force device detection
 *shift*:: 	shift data/instruction registers through JTAG chain
 *signal*:: 	define new signal for a part
 *svf*:: 	execute svf commands from file
@@ -497,6 +498,19 @@ Detects devices on the bus. Example:
     Stepping:     C0
     Filename:     /usr/local/share/jtag/intel/pxa250/pxa250c0
 
+===== setdevice =====
+//From README_21065L
+
+This command is currently only there to support the SHARC 21065L processor,
+which has no IDCODE.
+
+In jtag prompt type command "setdevice sharc21065L", now the mode changes to
+SHARC 21065L specific. Note that this mode works only with SHARC 21065L
+processor. If you want to try another device, please restart the JTAG tool.
+
+  jtag> setdevice sharc21065L
+  Device is set to SHARC 21065L
+
 //========================================================================
 
 == Internals ==
@@ -580,7 +594,6 @@ use.
  * Create and submit a patch
  * Use SourceForge trackers
 
-
 //========================================================================
 
 == F.A.Q. ==