Re: [OpenOCD-user] TI Cortex-A8 ICEpick emulation reset not working

[Paul F. <fer...@gm...>]

Hi,

On Mon, Feb 23, 2015 at 06:18:50AM +0100, Markus Korber wrote:
> I'm not even sure if the emulator soft reset is executed correctly. How can I
> check this? What else could I try?

To check you can pass -d3 to openocd or use "debug_level 3"
command. Then see if the target tap is enabled by using "targets"
command. If it's not enabled, run "jtag tapenable am335x.dap". Then to
reset run "am335x.cpu arp_reset assert 0; am335x.cpu arp_reset
deassert 0" or something similar. A deeper investigation pending. 

Please try this patch (apply manually, it's a bit garbled):

diff --git a/src/target/register.c b/src/target/register.c
index 42b3b8b..5b24f9c 100644
--- a/src/target/register.c
+++ b/src/target/register.c
@@ -75,6 +75,9 @@ struct reg_cache **register_get_last_cache_p(struct reg_cache **first)
 /** Marks the contents of the register cache as invalid (and clean). */
 void register_cache_invalidate(struct reg_cache *cache)
 {
+	if (!cache)
+	   return;
+
	struct reg *reg = cache->reg_list;
 
	for (unsigned n = cache->num_regs; n != 0; n--, reg++) {
diff --git a/src/target/target.c b/src/target/target.c
index 9f12704..d408c56 100644
--- a/src/target/target.c
+++ b/src/target/target.c
@@ -4764,10 +4764,6 @@ static int jim_target_reset(Jim_Interp *interp, int argc, Jim_Obj *const *argv)
   struct target *target = Jim_CmdPrivData(goi.interp);
   if (!target->tap->enabled)
      return jim_target_tap_disabled(interp);
-     if (!(target_was_examined(target))) {
-     	 LOG_ERROR("Target not examined yet");
-	 		   return ERROR_TARGET_NOT_EXAMINED;
-			   }
 			   if (!target->type->assert_reset || !target->type->deassert_reset) {
 			      Jim_SetResultFormatted(interp,
						"No target-specific reset for %s",


> What does "Target not examined yet" mean?

Examination is basically a procedure to configure the target CPU and
OpenOCD to work in debug mode.

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