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

Warn when people (or scripts) use numeric identifiers for TAPs,
instead of dotted.name values.  We want this usage to go away,
so that for example adding more TAPs doesn't cause config scripts
to break because some sequence number changed.

It's been deprecated since late 2008, but putting a warning on
this should help us remove it (say, in June 2010) by helping to
phase out old (ab)usage in config scripts.

Other than in various config files, the only code expecting such
a number was the almost unused str9xpec driver.  This code was
changed to use the TAP it was passed, instead of making its own
dubious lookup and ignoring that TAP.


git-svn-id: svn://svn.berlios.de/openocd/trunk@2415 b42882b7-edfa-0310-969c-e2dbd0fdcd60

doc/openocd.texi

@@ -2397,8 +2397,9 @@ and underscores are OK; while others (including dots!) are not.
 In older code, JTAG TAPs were numbered from 0..N.
 This feature is still present.
 However its use is highly discouraged, and
-should not be counted upon.
-Update all of your scripts to use TAP names rather than numbers.
+should not be relied on; it will be removed by mid-2010.
+Update all of your scripts to use TAP names rather than numbers,
+by paying attention to the runtime warnings they trigger.
 Using TAP numbers in target configuration scripts prevents
 reusing those scripts on boards with multiple targets.
 @end quotation

src/flash/str9xpec.c

@@ -318,14 +318,14 @@ static int str9xpec_flash_bank_command(struct command_context_s *cmd_ctx, char *
 	str9xpec_info = malloc(sizeof(str9xpec_flash_controller_t));
 	bank->driver_priv = str9xpec_info;
 
-	/* find out jtag position of flash controller
-	 * it is always after the arm966 core */
-
+	/* REVISIT verify that the jtag position of flash controller is
+	 * right after *THIS* core, which must be a STR9xx core ...
+	 */
 	armv4_5 = bank->target->arch_info;
 	arm7_9 = armv4_5->arch_info;
 	jtag_info = &arm7_9->jtag_info;
 
-	str9xpec_info->tap = jtag_tap_by_position(jtag_info->tap->abs_chain_position - 1);
+	str9xpec_info->tap = bank->target->tap;
 	str9xpec_info->isc_enable = 0;
 
 	str9xpec_build_block_list(bank);

src/jtag/core.c

@@ -162,10 +162,22 @@ void jtag_tap_add(struct jtag_tap_s *t)
 	*tap = t;
 }
 
+/* returns a pointer to the n-th device in the scan chain */
+static inline jtag_tap_t *jtag_tap_by_position(unsigned n)
+{
+	jtag_tap_t *t = jtag_all_taps();
+
+	while (t && n-- > 0)
+		t = t->next_tap;
+
+	return t;
+}
+
 jtag_tap_t *jtag_tap_by_string(const char *s)
 {
 	/* try by name first */
 	jtag_tap_t *t = jtag_all_taps();
+
 	while (t)
 	{
 		if (0 == strcmp(t->dotted_name, s))
@@ -178,7 +190,16 @@ jtag_tap_t *jtag_tap_by_string(const char *s)
 	if (parse_uint(s, &n) != ERROR_OK)
 		return NULL;
 
-	return jtag_tap_by_position(n);
+	/* FIXME remove this numeric fallback code late June 2010, along
+	 * with all info in the User's Guide that TAPs have numeric IDs.
+	 * Also update "scan_chain" output to not display the numbers.
+	 */
+	t = jtag_tap_by_position(n);
+	if (t)
+		LOG_WARNING("Specify TAP '%s' by name, not number %u",
+			t->dotted_name, n);
+
+	return t;
 }
 
 jtag_tap_t *jtag_tap_by_jim_obj(Jim_Interp *interp, Jim_Obj *o)
@@ -192,17 +213,6 @@ jtag_tap_t *jtag_tap_by_jim_obj(Jim_Interp *interp, Jim_Obj *o)
 	return t;
 }
 
-/* returns a pointer to the n-th device in the scan chain */
-jtag_tap_t *jtag_tap_by_position(unsigned n)
-{
-	jtag_tap_t *t = jtag_all_taps();
-
-	while (t && n-- > 0)
-		t = t->next_tap;
-
-	return t;
-}
-
 jtag_tap_t* jtag_tap_next_enabled(jtag_tap_t* p)
 {
 	p = p ? p->next_tap : jtag_all_taps();

src/jtag/jtag.h

@@ -185,7 +185,6 @@ extern jtag_tap_t* jtag_all_taps(void);
 extern const char *jtag_tap_name(const jtag_tap_t *tap);
 extern jtag_tap_t* jtag_tap_by_string(const char* dotted_name);
 extern jtag_tap_t* jtag_tap_by_jim_obj(Jim_Interp* interp, Jim_Obj* obj);
-extern jtag_tap_t* jtag_tap_by_position(unsigned abs_position);
 extern jtag_tap_t* jtag_tap_next_enabled(jtag_tap_t* p);
 extern unsigned jtag_tap_count_enabled(void);
 extern unsigned jtag_tap_count(void);