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-rw-r--r--src/svf/svf.c54
1 files changed, 34 insertions, 20 deletions
diff --git a/src/svf/svf.c b/src/svf/svf.c
index a25b3580..5b96971c 100644
--- a/src/svf/svf.c
+++ b/src/svf/svf.c
@@ -1,22 +1,21 @@
-/***************************************************************************
- * Copyright (C) 2009 by Simon Qian *
- * SimonQian@SimonQian.com *
- * *
- * This program is free software; you can redistribute it and/or modify *
- * it under the terms of the GNU General Public License as published by *
- * the Free Software Foundation; either version 2 of the License, or *
- * (at your option) any later version. *
- * *
- * This program is distributed in the hope that it will be useful, *
- * but WITHOUT ANY WARRANTY; without even the implied warranty of *
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
- * GNU General Public License for more details. *
- * *
- * You should have received a copy of the GNU General Public License *
- * along with this program; if not, write to the *
- * Free Software Foundation, Inc., *
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
- ***************************************************************************/
+/*
+ * Copyright (C) 2009 by Simon Qian
+ * SimonQian@SimonQian.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
/* The specification for SVF is available here:
@@ -98,7 +97,22 @@ typedef struct
tap_state_t paths[8];
}svf_statemove_t;
-svf_statemove_t svf_statemoves[] =
+/*
+ * These paths are from the SVF specification for the STATE command, to be
+ * used when the STATE command only includes the final state. The first
+ * element of the path is the "from" (current) state, and the last one is
+ * the "to" (target) state.
+ *
+ * All specified paths are the shortest ones in the JTAG spec, and are thus
+ * not (!!) exact matches for the paths used elsewhere in OpenOCD. Note
+ * that PAUSE-to-PAUSE transitions all go through UPDATE and then CAPTURE,
+ * which has specific effects on the various registers; they are not NOPs.
+ *
+ * Paths to RESET are disabled here. As elsewhere in OpenOCD, and in XSVF
+ * and many SVF implementations, we don't want to risk missing that state.
+ * To get to RESET, always we ignore the current state.
+ */
+static const svf_statemove_t svf_statemoves[] =
{
// from to num_of_moves, paths[8]
// {TAP_RESET, TAP_RESET, 1, {TAP_RESET}},