+@anchor{Define CPU targets working in SMP}
+@subsection Define CPU targets working in SMP
+@cindex SMP
+After setting targets, you can define a list of targets working in SMP.
+
+@example
+set _TARGETNAME_1 $_CHIPNAME.cpu1
+set _TARGETNAME_2 $_CHIPNAME.cpu2
+target create $_TARGETNAME_1 cortex_a8 -chain-position $_CHIPNAME.dap \
+-coreid 0 -dbgbase $_DAP_DBG1
+target create $_TARGETNAME_2 cortex_a8 -chain-position $_CHIPNAME.dap \
+-coreid 1 -dbgbase $_DAP_DBG2
+#define 2 targets working in smp.
+target smp $_CHIPNAME.cpu2 $_CHIPNAME.cpu1
+@end example
+In the above example on cortex_a8, 2 cpus are working in SMP.
+In SMP only one GDB instance is created and :
+@itemize @bullet
+@item a set of hardware breakpoint sets the same breakpoint on all targets in the list.
+@item halt command triggers the halt of all targets in the list.
+@item resume command triggers the write context and the restart of all targets in the list.
+@item following a breakpoint: the target stopped by the breakpoint is displayed to the GDB session.
+@item dedicated GDB serial protocol packets are implemented for switching/retrieving the target
+displayed by the GDB session @pxref{Using openocd SMP with GDB}.
+@end itemize
+
+The SMP behaviour can be disabled/enabled dynamically. On cortex_a8 following
+command have been implemented.
+@itemize @bullet
+@item cortex_a8 smp_on : enable SMP mode, behaviour is as described above.
+@item cortex_a8 smp_off : disable SMP mode, the current target is the one
+displayed in the GDB session, only this target is now controlled by GDB
+session. This behaviour is useful during system boot up.
+@item cortex_a8 smp_gdb : display/fix the core id displayed in GDB session see
+following example.
+@end itemize
+
+@example
+>cortex_a8 smp_gdb
+gdb coreid 0 -> -1
+#0 : coreid 0 is displayed to GDB ,
+#-> -1 : next resume triggers a real resume
+> cortex_a8 smp_gdb 1
+gdb coreid 0 -> 1
+#0 :coreid 0 is displayed to GDB ,
+#->1 : next resume displays coreid 1 to GDB
+> resume
+> cortex_a8 smp_gdb
+gdb coreid 1 -> 1
+#1 :coreid 1 is displayed to GDB ,
+#->1 : next resume displays coreid 1 to GDB
+> cortex_a8 smp_gdb -1
+gdb coreid 1 -> -1
+#1 :coreid 1 is displayed to GDB,
+#->-1 : next resume triggers a real resume
+@end example
+
+