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David Brownell <david-b@pacbell.net>: 

Make the TCL "drscan" and "irscan" commands finish in RUN/IDLE
unless the user specifies otherwise ... usually they'd choose
something like DRPAUSE or IRPAUSE, avoiding RUN/IDLE.

The current "end" state is whatever the preceding commands left
in "cmd_queue_end_state", which to TCL scripts isn't knowable.
This change should forestall various surprises/bugs.

Also check that any "end" state specified is safe in case this
adapter's JTAG clock is free-running.  For now, just issue a
warning; eventually a hard failure is probably correct.


git-svn-id: svn://svn.berlios.de/openocd/trunk@1988 b42882b7-edfa-0310-969c-e2dbd0fdcd60
This commit is contained in:
zwelch 2009-06-01 23:30:58 +00:00
parent 5120d1263b
commit a8f3ba8f5f
1 changed files with 39 additions and 8 deletions
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47
src/jtag/jtag.c
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@ -2955,6 +2955,26 @@ static int handle_runtest_command(struct command_context_s *cmd_ctx, char *cmd,
}
/*
* For "irscan" or "drscan" commands, the "end" (really, "next") state
* should be stable ... and *NOT* a shift state, otherwise free-running
* jtag clocks could change the values latched by the update state.
*/
static bool scan_is_safe(tap_state_t state)
{
switch (state)
{
case TAP_RESET:
case TAP_IDLE:
case TAP_DRPAUSE:
case TAP_IRPAUSE:
return true;
default:
return false;
}
}
static int handle_irscan_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
int i;
@ -2967,11 +2987,12 @@ static int handle_irscan_command(struct command_context_s *cmd_ctx, char *cmd, c
return ERROR_COMMAND_SYNTAX_ERROR;
}
/* optional "-endstate" */
/* "statename" */
/* at the end of the arguments. */
/* assume none. */
endstate = cmd_queue_end_state;
/* optional "-endstate" "statename" at the end of the arguments,
* so that e.g. IRPAUSE can let us load the data register before
* entering RUN/IDLE to execute the instruction we load here.
*/
endstate = TAP_IDLE;
if( argc >= 4 ){
/* have at least one pair of numbers. */
/* is last pair the magic text? */
@ -2988,6 +3009,9 @@ static int handle_irscan_command(struct command_context_s *cmd_ctx, char *cmd, c
if( endstate >= TAP_NUM_STATES ){
return ERROR_COMMAND_SYNTAX_ERROR;
} else {
if (!scan_is_safe(endstate))
LOG_WARNING("irscan with unsafe "
"endstate \"%s\"", cpA);
/* found - remove the last 2 args */
argc -= 2;
}
@ -3052,8 +3076,8 @@ static int Jim_Command_drscan(Jim_Interp *interp, int argc, Jim_Obj *const *args
return JIM_ERR;
}
/* assume no endstate */
endstate = cmd_queue_end_state;
endstate = TAP_IDLE;
/* validate arguments as numbers */
e = JIM_OK;
for (i = 2; i < argc; i+=2)
@ -3073,7 +3097,10 @@ static int Jim_Command_drscan(Jim_Interp *interp, int argc, Jim_Obj *const *args
return e;
}
/* it could be: "-endstate FOO" */
/* it could be: "-endstate FOO"
* e.g. DRPAUSE so we can issue more instructions
* before entering RUN/IDLE and executing them.
*/
/* get arg as a string. */
cp = Jim_GetString( args[i], NULL );
@ -3088,6 +3115,10 @@ static int Jim_Command_drscan(Jim_Interp *interp, int argc, Jim_Obj *const *args
/* update the error message */
Jim_SetResult_sprintf(interp,"endstate: %s invalid", cp );
} else {
if (!scan_is_safe(endstate))
LOG_WARNING("drscan with unsafe "
"endstate \"%s\"", cp);
/* valid - so clear the error */
e = JIM_OK;
/* and remove the last 2 args */