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Streamline Capture-IR validation code 

- Don't issue needless JTAG resets ... only do them after
   errors. Normal exit now leaves every TAP in BYPASS.
   
 - Fix an unlikely memory leak on one fault path.

 - Remove the oddball limitation that invalid capture LSBs 
   trigger errors only for TAPs that support IDCODE.

Re the JTAG reset:  there are too many of them, and they can
(and do!) change system state.  So the needless ones should
get removed.  This one was especially pointless.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2777 b42882b7-edfa-0310-969c-e2dbd0fdcd60
This commit is contained in:
dbrownell 2009-09-29 19:28:08 +00:00
parent 6d4cdddbe2
commit e4de4251fe
1 changed files with 23 additions and 26 deletions
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49
src/jtag/core.c
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@ -1058,6 +1058,9 @@ static int jtag_examine_chain(void)
* Validate the date loaded by entry to the Capture-IR state, to help
* find errors related to scan chain configuration (wrong IR lengths)
* or communication.
*
* Entry state can be anything. On non-error exit, all TAPs are in
* bypass mode. On error exits, the scan chain is reset.
*/
static int jtag_validate_ircapture(void)
{
@ -1066,23 +1069,21 @@ static int jtag_validate_ircapture(void)
uint8_t *ir_test = NULL;
scan_field_t field;
int chain_pos = 0;
int retval;
tap = NULL;
total_ir_length = 0;
for (;;) {
tap = jtag_tap_next_enabled(tap);
if (tap == NULL) {
break;
}
total_ir_length += tap->ir_length;
}
for (tap = NULL, total_ir_length = 0;
(tap = jtag_tap_next_enabled(tap)) != NULL;
total_ir_length += tap->ir_length)
continue;
/* increase length to add 2 bit sentinel after scan */
total_ir_length += 2;
ir_test = malloc(CEIL(total_ir_length, 8));
if (ir_test == NULL)
return ERROR_FAIL;
/* after this scan, all TAPs will capture BYPASS instructions */
buf_set_ones(ir_test, total_ir_length);
field.tap = NULL;
@ -1090,14 +1091,12 @@ static int jtag_validate_ircapture(void)
field.out_value = ir_test;
field.in_value = ir_test;
jtag_add_plain_ir_scan(1, &field, TAP_IDLE);
jtag_add_plain_ir_scan(1, &field, TAP_IRPAUSE);
jtag_add_tlr();
int retval;
LOG_DEBUG("IR capture validation scan");
retval = jtag_execute_queue();
if (retval != ERROR_OK)
return retval;
goto done;
tap = NULL;
chain_pos = 0;
@ -1119,14 +1118,9 @@ static int jtag_validate_ircapture(void)
LOG_ERROR("%s: IR capture error; saw 0x%s not 0x..1",
jtag_tap_name(tap), cbuf);
/* Fail only if we have IDCODE for this device.
* REVISIT -- why not fail-always?
*/
if (tap->hasidcode) {
free(cbuf);
free(ir_test);
return ERROR_JTAG_INIT_FAILED;
}
free(cbuf);
retval = ERROR_JTAG_INIT_FAILED;
goto done;
}
chain_pos += tap->ir_length;
}
@ -1140,13 +1134,16 @@ static int jtag_validate_ircapture(void)
LOG_ERROR("IR capture error at bit %d, saw 0x%s not 0x...3",
chain_pos, cbuf);
free(cbuf);
free(ir_test);
return ERROR_JTAG_INIT_FAILED;
retval = ERROR_JTAG_INIT_FAILED;
}
done:
free(ir_test);
return ERROR_OK;
if (retval != ERROR_OK) {
jtag_add_tlr();
jtag_execute_queue();
}
return retval;
}