verify the part is a Blackfin before we try using the bfin command on it and segfaulting

git-svn-id: https://urjtag.svn.sourceforge.net/svnroot/urjtag/trunk@1884 b68d4a1b-bc3d-0410-92ed-d4ac073336b7

urjtag/ChangeLog

@@ -1,3 +1,8 @@
+2011-02-19  Mike Frysinger  <vapier@gentoo.org>
+
+  * src/cmd/cmd_bfin.c (cmd_bfin_run): Make sure the part is a Blackfin before
+    we try calling functions that don't exist and segfault.
+
 2011-02-18  Mike Frysinger  <vapier@gentoo.org>
 
   * src/bfin/bfin-part.c (_bfin_part_init): Add missing "void" to param list.

urjtag/src/cmd/cmd_bfin.c

@@ -70,6 +70,12 @@ cmd_bfin_run (urj_chain_t *chain, char *params[])
         return URJ_STATUS_FAIL;
     }
 
+    if (!part_is_bfin (chain, chain->active_part))
+    {
+        urj_error_set (URJ_ERROR_ILLEGAL_STATE, "not a Blackfin part");
+        return URJ_STATUS_FAIL;
+    }
+
     assert (chain->active_part >= 0 && chain->active_part < chain->parts->len);
 
     if (strcmp (params[1], "emulation") == 0)