Make "-expected-id 0" suppress warnings; not unlike it used to do.

git-svn-id: svn://svn.berlios.de/openocd/trunk@2775 b42882b7-edfa-0310-969c-e2dbd0fdcd60

2 files changed, 12 insertions, 6 deletions

diff --git a/doc/openocd.texi b/doc/openocd.texi
index 716c4523..d80ef492 100644
--- a/doc/openocd.texi
+++ b/doc/openocd.texi
@@ -1253,7 +1253,7 @@ to source such a config file twice, with different
 values for @code{CHIPNAME}, so
 it adds a different TAP each time.
 
-If there are one or more nonzero @option{-expected-id} values,
+If there are nonzero @option{-expected-id} values,
 OpenOCD attempts to verify the actual tap id against those values.
 It will issue error messages if there is mismatch, which
 can help to pinpoint problems in OpenOCD configurations.
@@ -2373,11 +2373,13 @@ You may use @code{-enable} to highlight the default state
 (the TAP is linked in).
 @xref{Enabling and Disabling TAPs}.
 @item @code{-expected-id} @var{number}
-@*A non-zero value represents the expected 32-bit IDCODE
-found when the JTAG chain is examined.
+@*A non-zero @var{number} represents a 32-bit IDCODE
+which you expect to find when the scan chain is examined.
 These codes are not required by all JTAG devices.
 @emph{Repeat the option} as many times as required if more than one
 ID code could appear (for example, multiple versions).
+Specify @var{number} as zero to suppress warnings about IDCODE
+values that were found but not included in the list.
 @item @code{-ircapture} @var{NUMBER}
 @*The bit pattern loaded by the TAP into the JTAG shift register
 on entry to the @sc{ircapture} state, such as 0x01.
diff --git a/src/jtag/core.c b/src/jtag/core.c
index 78f67db3..056fa990 100644
--- a/src/jtag/core.c
+++ b/src/jtag/core.c
@@ -959,10 +959,14 @@ static bool jtag_examine_chain_match_tap(const struct jtag_tap_s *tap)
 	{
 		if (tap->idcode == tap->expected_ids[ii])
 			return true;
+
+		/* treat "-expected-id 0" as a "don't-warn" wildcard */
+		if (0 == tap->expected_ids[ii])
+			return true;
 	}
 
-	/* If none of the expected ids matched, log an error */
-	jtag_examine_chain_display(LOG_LVL_ERROR, "UNEXPECTED",
+	/* If none of the expected ids matched, warn */
+	jtag_examine_chain_display(LOG_LVL_WARNING, "UNEXPECTED",
 			tap->dotted_name, tap->idcode);
 	for (ii = 0; ii < tap->expected_ids_cnt; ii++)
 	{
@@ -1025,7 +1029,7 @@ static int jtag_examine_chain(void)
 		}
 		tap->idcode = idcode;
 
-		// ensure the TAP ID does matches what was expected
+		/* ensure the TAP ID matches what was expected */
 		if (!jtag_examine_chain_match_tap(tap))
 			return ERROR_JTAG_INIT_FAILED;
 	}