jtag newtap change & huge manual update

git-svn-id: svn://svn.berlios.de/openocd/trunk@1194 b42882b7-edfa-0310-969c-e2dbd0fdcd60
2026-02-25 13:15:07 -08:00 · 2008-11-30 22:25:43 +00:00
parent 91afc3dc30
commit a28eaa85f7
99 changed files with 5029 additions and 1992 deletions
--- a/137
+++ b/137
@@ -0,0 +1,137 @@
+Reporting Unknown JTAG TAP IDS
+------------------------------
+
+If OpenOCD reports an UNKNOWN or Unexpected Tap ID please report it to
+the development mailing list - However - keep reading.
+
+openocd-development@lists.berlios.de.
+
+========================================
+
+About "UNEXPECTED" tap ids.
+
+  Before reporting an "UNEXPECTED TAP ID" - take a closer look.
+  Perhaps you have your OpenOCD configured the wrong way, maybe you
+  have the tap configured the wrong way? Or something else is wrong.
+  (Remember: OpenOCD does not stop if the tap is not present)
+
+  This "tap id check" is there for a purpose.
+  The goal is to help get the *right* configuration.
+
+The idea is this:
+
+  Every JTAG tap is suppose to have "a unique 32bit tap id" number.
+  They are suppose to be "sort of unique" but they are not.  There are
+  no guarantees.
+
+Version Number Changes:
+
+  Sometimes, the tap ID only differs by VERSION number. If so - it's
+  not a big deal.  Please do report this information.  We'd like to
+  know about it.
+
+  For example 
+
+Error:  ERROR: Tap: s3c4510.cpu - Expected id: 0x3f0f0f0f, Got: 0x1f0f0f0f
+Error:  ERROR: expected: mfg: 0x787, part: 0xf0f0, ver: 0x3
+Error:  ERROR:      got: mfg: 0x787, part: 0xf0f0, ver: 0x1
+
+========================================
+
+Updating the Tap ID number your self
+ 
+  Why do this? You just want the warning to go away.  And don't want
+  to update your version/instance of OpenOCD.
+
+  On simple systems, to fix this problem, in your "openocd.cfg" file,
+  override the tap id.  Depending on the tap, add one of these 3
+  commands:
+
+	set CPUTAPID   newvalue
+  or	set BSTAPID    newvalue
+  or	set FLASHTAPID newvalue
+  or	set ETMTAPID   newvalue
+
+  Where "newvalue" is the new value you are seeing.
+
+  On complex systems, (with many taps and chips) you probably have a
+  custom configuration file. Its is more complicated, you're going to
+  have to read through the configuration files
+
+========================================
+
+What to send:
+
+Cut & paste the output of OpenOCD that pointed you at this file.
+
+Please include the VERSION number of OpenOCD you are using.
+
+And please include the information below.
+
+========================================
+
+A) The JTAG TAP ID code.
+
+This is always a 32bit hex number.
+
+Examples:
+    0x1f0f0f0f - is an old ARM7TDMI
+    0x3f0f0f0f - is a newer ARM7TDMI
+    0x3ba00477 - is an ARM cortex M3
+
+Some chips have multiple JTAG taps - be sure to list 
+each one individually - ORDER is important!
+
+========================================
+B) The maker of the part 
+
+Examples:
+    Xilinx, Atmel, ST Micro Systems, Freescale
+
+========================================
+C) The family of parts it belongs to
+
+Examples:
+   "NXP LPC Series"
+   "Atmel SAM7 Series"
+   
+========================================
+
+D) The actual part number on the package
+
+   For example: "S3C45101x01"
+
+========================================
+
+E) What type of board it is.
+
+ie: a "commercial off the self eval board" that one can purchase (as
+opposed to your private internal custom board)
+
+For example: ST Micro systems has Eval boards, so does Analog Devices
+
+Or - if it is inside something "hackers like to hack" that information
+is helpful too.
+
+For example: A consumer GPS unit or a cellphone
+
+========================================
+
+(F)   The maker of the board
+        ie: Olimex, LogicPD, Freescale(eval board)
+
+========================================
+	 
+(G)   Identifying information on the board.
+
+      Not good:   "iar red ST eval board"
+
+      Really good: "IAR STR912-SK evaluation board"
+
+========================================
+
+(H) Are there other interesting (JTAG) chips on the board?
+
+    ie: An FPGA or CPLD ...
+
+========================================
--- a/doc/openocd.texi
+++ b/doc/openocd.texi
--- a/src/flash/str9xpec.c
+++ b/src/flash/str9xpec.c
@@ -111,20 +111,18 @@ int str9xpec_register_commands(struct command_context_s *cmd_ctx)
 	return ERROR_OK;
 }

-int str9xpec_set_instr(int chain_pos, u32 new_instr, enum tap_state end_state)
+int str9xpec_set_instr(jtag_tap_t *tap, u32 new_instr, enum tap_state end_state)
 {
-	jtag_device_t *device = jtag_get_device(chain_pos);
-	if (device == NULL)
-	{
+	if( tap == NULL ){
 		return ERROR_TARGET_INVALID;
 	}

-	if (buf_get_u32(device->cur_instr, 0, device->ir_length) != new_instr)
+	if (buf_get_u32(tap->cur_instr, 0, tap->ir_length) != new_instr)
 	{
 		scan_field_t field;

-		field.device = chain_pos;
-		field.num_bits = device->ir_length;
+		field.tap = tap;
+		field.num_bits = tap->ir_length;
 		field.out_value = calloc(CEIL(field.num_bits, 8), 1);
 		buf_set_u32(field.out_value, 0, field.num_bits, new_instr);
 		field.out_mask = NULL;
@@ -142,15 +140,15 @@ int str9xpec_set_instr(int chain_pos, u32 new_instr, enum tap_state end_state)
 	return ERROR_OK;
 }

-u8 str9xpec_isc_status(int chain_pos)
+u8 str9xpec_isc_status(jtag_tap_t *tap)
 {
 	scan_field_t field;
 	u8 status;

-	if (str9xpec_set_instr(chain_pos, ISC_NOOP, TAP_PI) != ERROR_OK)
+	if (str9xpec_set_instr(tap, ISC_NOOP, TAP_PI) != ERROR_OK)
 		return ISC_STATUS_ERROR;

-	field.device = chain_pos;
+	field.tap = tap;
 	field.num_bits = 8;
 	field.out_value = NULL;
 	field.out_mask = NULL;
@@ -174,20 +172,20 @@ u8 str9xpec_isc_status(int chain_pos)
 int str9xpec_isc_enable(struct flash_bank_s *bank)
 {
 	u8 status;
-	u32 chain_pos;
+	jtag_tap_t *tap;
 	str9xpec_flash_controller_t *str9xpec_info = bank->driver_priv;

-	chain_pos = str9xpec_info->chain_pos;
+	tap = str9xpec_info->tap;

 	if (str9xpec_info->isc_enable)
 		return ERROR_OK;

 	/* enter isc mode */
-	if (str9xpec_set_instr(chain_pos, ISC_ENABLE, TAP_RTI) != ERROR_OK)
+	if (str9xpec_set_instr(tap, ISC_ENABLE, TAP_RTI) != ERROR_OK)
 		return ERROR_TARGET_INVALID;

 	/* check ISC status */
-	status = str9xpec_isc_status(chain_pos);
+	status = str9xpec_isc_status(tap);
 	if (status & ISC_STATUS_MODE)
 	{
 		/* we have entered isc mode */
@@ -201,22 +199,22 @@ int str9xpec_isc_enable(struct flash_bank_s *bank)
 int str9xpec_isc_disable(struct flash_bank_s *bank)
 {
 	u8 status;
-	u32 chain_pos;
+	jtag_tap_t *tap;
 	str9xpec_flash_controller_t *str9xpec_info = bank->driver_priv;

-	chain_pos = str9xpec_info->chain_pos;
+	tap = str9xpec_info->tap;

 	if (!str9xpec_info->isc_enable)
 		return ERROR_OK;

-	if (str9xpec_set_instr(chain_pos, ISC_DISABLE, TAP_RTI) != ERROR_OK)
+	if (str9xpec_set_instr(tap, ISC_DISABLE, TAP_RTI) != ERROR_OK)
 		return ERROR_TARGET_INVALID;

 	/* delay to handle aborts */
 	jtag_add_sleep(50);

 	/* check ISC status */
-	status = str9xpec_isc_status(chain_pos);
+	status = str9xpec_isc_status(tap);
 	if (!(status & ISC_STATUS_MODE))
 	{
 		/* we have left isc mode */
@@ -231,18 +229,18 @@ int str9xpec_read_config(struct flash_bank_s *bank)
 {
 	scan_field_t field;
 	u8 status;
-	u32 chain_pos;
+	jtag_tap_t *tap;

 	str9xpec_flash_controller_t *str9xpec_info = bank->driver_priv;

-	chain_pos = str9xpec_info->chain_pos;
+	tap = str9xpec_info->tap;

 	LOG_DEBUG("ISC_CONFIGURATION");

 	/* execute ISC_CONFIGURATION command */
-	str9xpec_set_instr(chain_pos, ISC_CONFIGURATION, TAP_PI);
+	str9xpec_set_instr(tap, ISC_CONFIGURATION, TAP_PI);

-	field.device = chain_pos;
+	field.tap = tap;
 	field.num_bits = 64;
 	field.out_value = NULL;
 	field.out_mask = NULL;
@@ -255,7 +253,7 @@ int str9xpec_read_config(struct flash_bank_s *bank)
 	jtag_add_dr_scan(1, &field, TAP_RTI);
 	jtag_execute_queue();

-	status = str9xpec_isc_status(chain_pos);
+	status = str9xpec_isc_status(tap);

 	return status;
 }
@@ -352,9 +350,11 @@ int str9xpec_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, ch
 	arm7_9 = armv4_5->arch_info;
 	jtag_info = &arm7_9->jtag_info;

-	str9xpec_info->chain_pos = (jtag_info->chain_pos - 1);
+	
+
+	str9xpec_info->tap = jtag_TapByAbsPosition( jtag_info->tap->abs_chain_position - 1);
 	str9xpec_info->isc_enable = 0;
-	str9xpec_info->devarm = NULL;
+

 	str9xpec_build_block_list(bank);

@@ -368,13 +368,13 @@ int str9xpec_blank_check(struct flash_bank_s *bank, int first, int last)
 {
 	scan_field_t field;
 	u8 status;
-	u32 chain_pos;
+	jtag_tap_t *tap;
 	int i;
 	u8 *buffer = NULL;

 	str9xpec_flash_controller_t *str9xpec_info = bank->driver_priv;

-	chain_pos = str9xpec_info->chain_pos;
+	tap = str9xpec_info->tap;

 	if (!str9xpec_info->isc_enable) {
 		str9xpec_isc_enable( bank );
@@ -393,9 +393,9 @@ int str9xpec_blank_check(struct flash_bank_s *bank, int first, int last)
 	}

 	/* execute ISC_BLANK_CHECK command */
-	str9xpec_set_instr(chain_pos, ISC_BLANK_CHECK, TAP_PI);
+	str9xpec_set_instr(tap, ISC_BLANK_CHECK, TAP_PI);

-	field.device = chain_pos;
+	field.tap = tap;
 	field.num_bits = 64;
 	field.out_value = buffer;
 	field.out_mask = NULL;
@@ -409,7 +409,7 @@ int str9xpec_blank_check(struct flash_bank_s *bank, int first, int last)
 	jtag_add_sleep(40000);

 	/* read blank check result */
-	field.device = chain_pos;
+	field.tap = tap;
 	field.num_bits = 64;
 	field.out_value = NULL;
 	field.out_mask = NULL;
@@ -422,7 +422,7 @@ int str9xpec_blank_check(struct flash_bank_s *bank, int first, int last)
 	jtag_add_dr_scan(1, &field, TAP_PI);
 	jtag_execute_queue();

-	status = str9xpec_isc_status(chain_pos);
+	status = str9xpec_isc_status(tap);

 	for (i = first; i <= last; i++)
 	{
@@ -467,13 +467,13 @@ int str9xpec_erase_area(struct flash_bank_s *bank, int first, int last)
 {
 	scan_field_t field;
 	u8 status;
-	u32 chain_pos;
+	jtag_tap_t *tap;
 	int i;
 	u8 *buffer = NULL;

 	str9xpec_flash_controller_t *str9xpec_info = bank->driver_priv;

-	chain_pos = str9xpec_info->chain_pos;
+	tap = str9xpec_info->tap;

 	if (!str9xpec_info->isc_enable) {
 		str9xpec_isc_enable( bank );
@@ -509,9 +509,9 @@ int str9xpec_erase_area(struct flash_bank_s *bank, int first, int last)
 	LOG_DEBUG("ISC_ERASE");

 	/* execute ISC_ERASE command */
-	str9xpec_set_instr(chain_pos, ISC_ERASE, TAP_PI);
+	str9xpec_set_instr(tap, ISC_ERASE, TAP_PI);

-	field.device = chain_pos;
+	field.tap = tap;
 	field.num_bits = 64;
 	field.out_value = buffer;
 	field.out_mask = NULL;
@@ -527,7 +527,7 @@ int str9xpec_erase_area(struct flash_bank_s *bank, int first, int last)
 	jtag_add_sleep(10);

 	/* wait for erase completion */
-	while (!((status = str9xpec_isc_status(chain_pos)) & ISC_STATUS_BUSY)) {
+	while (!((status = str9xpec_isc_status(tap)) & ISC_STATUS_BUSY)) {
 		alive_sleep(1);
 	}

@@ -554,11 +554,11 @@ int str9xpec_lock_device(struct flash_bank_s *bank)
 {
 	scan_field_t field;
 	u8 status;
-	u32 chain_pos;
+	jtag_tap_t *tap;
 	str9xpec_flash_controller_t *str9xpec_info = NULL;

 	str9xpec_info = bank->driver_priv;
-	chain_pos = str9xpec_info->chain_pos;
+	tap = str9xpec_info->tap;

 	if (!str9xpec_info->isc_enable) {
 		str9xpec_isc_enable( bank );
@@ -572,12 +572,12 @@ int str9xpec_lock_device(struct flash_bank_s *bank)
 	str9xpec_set_address(bank, 0x80);

 	/* execute ISC_PROGRAM command */
-	str9xpec_set_instr(chain_pos, ISC_PROGRAM_SECURITY, TAP_RTI);
+	str9xpec_set_instr(tap, ISC_PROGRAM_SECURITY, TAP_RTI);

-	str9xpec_set_instr(chain_pos, ISC_NOOP, TAP_PI);
+	str9xpec_set_instr(tap, ISC_NOOP, TAP_PI);

 	do {
-		field.device = chain_pos;
+		field.tap = tap;
 		field.num_bits = 8;
 		field.out_value = NULL;
 		field.out_mask = NULL;
@@ -654,16 +654,16 @@ int str9xpec_protect(struct flash_bank_s *bank, int set, int first, int last)

 int str9xpec_set_address(struct flash_bank_s *bank, u8 sector)
 {
-	u32 chain_pos;
+	jtag_tap_t *tap;
 	scan_field_t field;
 	str9xpec_flash_controller_t *str9xpec_info = bank->driver_priv;

-	chain_pos = str9xpec_info->chain_pos;
+	tap = str9xpec_info->tap;

 	/* set flash controller address */
-	str9xpec_set_instr(chain_pos, ISC_ADDRESS_SHIFT, TAP_PI);
+	str9xpec_set_instr(tap, ISC_ADDRESS_SHIFT, TAP_PI);

-	field.device = chain_pos;
+	field.tap = tap;
 	field.num_bits = 8;
 	field.out_value = &sector;
 	field.out_mask = NULL;
@@ -686,14 +686,14 @@ int str9xpec_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
 	u32 bytes_written = 0;
 	u8 status;
 	u32 check_address = offset;
-	u32 chain_pos;
+	jtag_tap_t *tap;
 	scan_field_t field;
 	u8 *scanbuf;
 	int i;
 	u32 first_sector = 0;
 	u32 last_sector = 0;

-	chain_pos = str9xpec_info->chain_pos;
+	tap = str9xpec_info->tap;

 	if (!str9xpec_info->isc_enable) {
 		str9xpec_isc_enable(bank);
@@ -750,9 +750,9 @@ int str9xpec_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)

 		while (dwords_remaining > 0)
 		{
-			str9xpec_set_instr(chain_pos, ISC_PROGRAM, TAP_PI);
+			str9xpec_set_instr(tap, ISC_PROGRAM, TAP_PI);

-			field.device = chain_pos;
+			field.tap = tap;
 			field.num_bits = 64;
 			field.out_value = (buffer + bytes_written);
 			field.out_mask = NULL;
@@ -767,10 +767,10 @@ int str9xpec_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
 			/* small delay before polling */
 			jtag_add_sleep(50);

-			str9xpec_set_instr(chain_pos, ISC_NOOP, TAP_PI);
+			str9xpec_set_instr(tap, ISC_NOOP, TAP_PI);

 			do {
-				field.device = chain_pos;
+				field.tap = tap;
 				field.num_bits = 8;
 				field.out_value = NULL;
 				field.out_mask = NULL;
@@ -810,9 +810,9 @@ int str9xpec_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
 			bytes_written++;
 		}

-		str9xpec_set_instr(chain_pos, ISC_PROGRAM, TAP_PI);
+		str9xpec_set_instr(tap, ISC_PROGRAM, TAP_PI);

-		field.device = chain_pos;
+		field.tap = tap;
 		field.num_bits = 64;
 		field.out_value = last_dword;
 		field.out_mask = NULL;
@@ -827,10 +827,10 @@ int str9xpec_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
 		/* small delay before polling */
 		jtag_add_sleep(50);

-		str9xpec_set_instr(chain_pos, ISC_NOOP, TAP_PI);
+		str9xpec_set_instr(tap, ISC_NOOP, TAP_PI);

 		do {
-			field.device = chain_pos;
+			field.tap = tap;
 			field.num_bits = 8;
 			field.out_value = NULL;
 			field.out_mask = NULL;
@@ -871,7 +871,7 @@ int str9xpec_handle_part_id_command(struct command_context_s *cmd_ctx, char *cmd
 	flash_bank_t *bank;
 	scan_field_t field;
 	u8 *buffer = NULL;
-	u32 chain_pos;
+	jtag_tap_t *tap;
 	u32 idcode;
 	str9xpec_flash_controller_t *str9xpec_info = NULL;

@@ -888,13 +888,13 @@ int str9xpec_handle_part_id_command(struct command_context_s *cmd_ctx, char *cmd
 	}

 	str9xpec_info = bank->driver_priv;
-	chain_pos = str9xpec_info->chain_pos;
+	tap = str9xpec_info->tap;

 	buffer = calloc(CEIL(32, 8), 1);

-	str9xpec_set_instr(chain_pos, ISC_IDCODE, TAP_PI);
+	str9xpec_set_instr(tap, ISC_IDCODE, TAP_PI);

-	field.device = chain_pos;
+	field.tap = tap;
 	field.num_bits = 32;
 	field.out_value = NULL;
 	field.out_mask = NULL;
@@ -990,11 +990,11 @@ int str9xpec_write_options(struct flash_bank_s *bank)
 {
 	scan_field_t field;
 	u8 status;
-	u32 chain_pos;
+	jtag_tap_t *tap;
 	str9xpec_flash_controller_t *str9xpec_info = NULL;

 	str9xpec_info = bank->driver_priv;
-	chain_pos = str9xpec_info->chain_pos;
+	tap = str9xpec_info->tap;

 	/* erase config options first */
 	status = str9xpec_erase_area( bank, 0xFE, 0xFE );
@@ -1017,9 +1017,9 @@ int str9xpec_write_options(struct flash_bank_s *bank)
 	str9xpec_set_address(bank, 0x50);

 	/* execute ISC_PROGRAM command */
-	str9xpec_set_instr(chain_pos, ISC_PROGRAM, TAP_PI);
+	str9xpec_set_instr(tap, ISC_PROGRAM, TAP_PI);

-	field.device = chain_pos;
+	field.tap = tap;
 	field.num_bits = 64;
 	field.out_value = str9xpec_info->options;
 	field.out_mask = NULL;
@@ -1034,10 +1034,10 @@ int str9xpec_write_options(struct flash_bank_s *bank)
 	/* small delay before polling */
 	jtag_add_sleep(50);

-	str9xpec_set_instr(chain_pos, ISC_NOOP, TAP_PI);
+	str9xpec_set_instr(tap, ISC_NOOP, TAP_PI);

 	do {
-		field.device = chain_pos;
+		field.tap = tap;
 		field.num_bits = 8;
 		field.out_value = NULL;
 		field.out_mask = NULL;
@@ -1265,11 +1265,16 @@ int str9xpec_handle_flash_unlock_command(struct command_context_s *cmd_ctx, char

 int str9xpec_handle_flash_enable_turbo_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
+#if 1
+	command_print( cmd_ctx, "**STR9FLASH is currently broken :-( **");
+	return ERROR_OK;
+#else
 	int retval;
 	flash_bank_t *bank;
-	u32 chain_pos;
-	jtag_device_t* dev0;
-	jtag_device_t* dev2;
+	jtag_tap_t *tapX;
+	jtag_tap_t *tap0;
+	jtag_tap_t *tap1;
+	jtag_tap_t *tap2;
 	str9xpec_flash_controller_t *str9xpec_info = NULL;

 	if (argc < 1)
@@ -1287,33 +1292,46 @@ int str9xpec_handle_flash_enable_turbo_command(struct command_context_s *cmd_ctx

 	str9xpec_info = bank->driver_priv;

-	chain_pos = str9xpec_info->chain_pos;
+	tapX = str9xpec_info->tap;

 	/* remove arm core from chain - enter turbo mode */
+	//
+	// At postion +2 in the chain, 
+	// I do not think this is right..
+	// I have not tested it...
+	// and it is a bit wacky right now.
+	// -- Duane 25/nov/2008
+	tap0 = tapX;
+	tap1 = tap0->next_tap;
+	if( tap1 == NULL ){
+		// things are *WRONG*
+		command_print(cmd_ctx,"**STR9FLASH** (tap1) invalid chain?");
+		return ERROR_OK;
+	}
+	tap2 = tap1->next_tap;
+	if( tap2 == NULL ){
+		// things are *WRONG*
+		command_print(cmd_ctx,"**STR9FLASH** (tap2) invalid chain?");
+		return ERROR_OK;
+	}

-	str9xpec_set_instr(chain_pos+2, 0xD, TAP_RTI);
+	// this instruction disables the arm9 tap
+	str9xpec_set_instr(tap2, 0xD, TAP_RTI);
 	if ((retval=jtag_execute_queue())!=ERROR_OK)
 		return retval;

 	/* modify scan chain - str9 core has been removed */
-	dev0 = jtag_get_device(chain_pos);
-	if (dev0 == NULL)
-		return ERROR_FAIL;
-	str9xpec_info->devarm = jtag_get_device(chain_pos+1);
-	dev2 = jtag_get_device(chain_pos+2);
-	if (dev2 == NULL)
-		return ERROR_FAIL;
-	dev0->next = dev2;
-	jtag_num_devices--;
+	str9xpec_info->devarm = tap1;
+	tap1->enabled = 0;

 	return ERROR_OK;
+#endif
 }

 int str9xpec_handle_flash_disable_turbo_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
 	flash_bank_t *bank;
-	u32 chain_pos;
-	jtag_device_t* dev0;
+	jtag_tap_t *tap;
 	str9xpec_flash_controller_t *str9xpec_info = NULL;

 	if (argc < 1)
@@ -1331,22 +1349,18 @@ int str9xpec_handle_flash_disable_turbo_command(struct command_context_s *cmd_ct

 	str9xpec_info = bank->driver_priv;

-	chain_pos = str9xpec_info->chain_pos;
+	tap = str9xpec_info->tap;

-	dev0 = jtag_get_device(chain_pos);
-	if (dev0 == NULL)
+	if (tap == NULL)
 		return ERROR_FAIL;


 	/* exit turbo mode via TLR */
-	str9xpec_set_instr(chain_pos, ISC_NOOP, TAP_TLR);
+	str9xpec_set_instr(tap, ISC_NOOP, TAP_TLR);
 	jtag_execute_queue();
-
 	/* restore previous scan chain */
-	if( str9xpec_info->devarm ) {
-		dev0->next = str9xpec_info->devarm;
-		jtag_num_devices++;
-		str9xpec_info->devarm = NULL;
+	if( tap->next_tap ){
+		tap->next_tap->enabled = 1;
 	}

 	return ERROR_OK;
--- a/src/flash/str9xpec.h
+++ b/src/flash/str9xpec.h
@@ -29,10 +29,10 @@

 typedef struct str9xpec_flash_controller_s
 {
+	jtag_tap_t *tap;
 	u32 *sector_bits;
 	int chain_pos;
 	int isc_enable;
-	jtag_device_t* devarm;
 	u8 options[8];
 } str9xpec_flash_controller_t;

--- a/src/helper/types.h
+++ b/src/helper/types.h
@@ -44,6 +44,8 @@ typedef unsigned long long u64;
 #endif


+typedef struct jtag_tap_s jtag_tap_t;
+

 /* DANGER!!!! here be dragons! Note that the pointer in 
 * memory might be unaligned. On some CPU's, i.e. ARM7,
--- a/src/jtag/jtag.c
+++ b/src/jtag/jtag.c
--- a/src/jtag/jtag.h
+++ b/src/jtag/jtag.h
@@ -75,7 +75,7 @@ typedef int (*in_handler_t)(u8 *in_value, void *priv, struct scan_field_s *field

 typedef struct scan_field_s
 {
-	int device;			/* ordinal device number this instruction refers to */
+	jtag_tap_t *tap;	/* tap pointer this instruction refers to */
 	int num_bits;		/* number of bits this field specifies (up to 32) */
 	u8 *out_value;		/* value to be scanned into the device */
 	u8 *out_mask;		/* only masked bits care */
@@ -163,20 +163,39 @@ typedef struct jtag_command_s

 extern jtag_command_t *jtag_command_queue;

-typedef struct jtag_device_s
+// this is really: typedef jtag_tap_t
+// But - the typedef is done in "types.h"
+// due to "forward decloration reasons"
+struct jtag_tap_s
 {
+	const char *chip;
+	const char *tapname;
+	const char *dotted_name;
+	int         abs_chain_position;
+	int enabled;
 	int ir_length;		/* size of instruction register */
+	u32 ir_capture_value;
 	u8 *expected;		/* Capture-IR expected value */
+	u32 ir_capture_mask;
 	u8 *expected_mask;	/* Capture-IR expected mask */
 	u32 idcode;			/* device identification code */
+	u32 expected_id;
 	u8 *cur_instr;		/* current instruction */
 	int bypass;			/* bypass register selected */
-	struct jtag_device_s *next;
-} jtag_device_t;
+	jtag_tap_t *next_tap;
+};
+extern jtag_tap_t *jtag_AllTaps(void);
+extern jtag_tap_t *jtag_TapByPosition(int n);
+extern jtag_tap_t *jtag_NextEnabledTap( jtag_tap_t * );
+extern jtag_tap_t *jtag_TapByPosition( int n );
+extern jtag_tap_t *jtag_TapByString( const char *dotted_name );
+extern jtag_tap_t *jtag_TapByJimObj( Jim_Interp *interp, Jim_Obj *obj );
+extern jtag_tap_t *jtag_TapByAbsPosition( int abs_position );
+extern int         jtag_NumEnabledTaps(void);
+extern int         jtag_NumTotalTaps(void);
+
+

-extern jtag_device_t *jtag_devices;
-extern int jtag_num_devices;
-extern int jtag_ir_scan_size;

 enum reset_line_mode
 {
@@ -420,7 +439,7 @@ extern enum scan_type jtag_scan_type(scan_command_t *cmd);
 extern int jtag_scan_size(scan_command_t *cmd);
 extern int jtag_read_buffer(u8 *buffer, scan_command_t *cmd);
 extern int jtag_build_buffer(scan_command_t *cmd, u8 **buffer);
-extern jtag_device_t* jtag_get_device(int num);
+
 extern void jtag_sleep(u32 us);
 extern int jtag_call_event_callbacks(enum jtag_event event);
 extern int jtag_register_event_callback(int (*callback)(enum jtag_event event, void *priv), void *priv);
@@ -463,7 +482,7 @@ extern int jtag_verify_capture_ir;
 *
 * Note that this jtag_add_dr_out can be defined as an inline function.
 */
-extern void interface_jtag_add_dr_out(int device,
+extern void interface_jtag_add_dr_out(jtag_tap_t *tap,
 		int num_fields,
 		const int *num_bits,
 		const u32 *value,
@@ -473,7 +492,7 @@ extern void interface_jtag_add_dr_out(int device,



-static __inline__ void jtag_add_dr_out(int device,
+static __inline__ void jtag_add_dr_out(jtag_tap_t *tap,
 		int num_fields,
 		const int *num_bits,
 		const u32 *value,
@@ -482,7 +501,7 @@ static __inline__ void jtag_add_dr_out(int device,
 	if (end_state != -1)
 		cmd_queue_end_state=end_state;
 	cmd_queue_cur_state=cmd_queue_end_state;
-	interface_jtag_add_dr_out(device, num_fields, num_bits, value, cmd_queue_end_state);
+	interface_jtag_add_dr_out(tap, num_fields, num_bits, value, cmd_queue_end_state);
 }


--- a/src/pld/virtex2.c
+++ b/src/pld/virtex2.c
@@ -43,18 +43,17 @@ pld_driver_t virtex2_pld =
 	.load = virtex2_load,
 };

-int virtex2_set_instr(int chain_pos, u32 new_instr)
+int virtex2_set_instr(jtag_tap_t *tap, u32 new_instr)
 {
-	jtag_device_t *device = jtag_get_device(chain_pos);
-	if (device==NULL)
+	if (tap==NULL)
 		return ERROR_FAIL;

-	if (buf_get_u32(device->cur_instr, 0, device->ir_length) != new_instr)
+	if (buf_get_u32(tap->cur_instr, 0, tap->ir_length) != new_instr)
 	{
 		scan_field_t field;

-		field.device = chain_pos;
-		field.num_bits = device->ir_length;
+		field.tap = tap;
+		field.num_bits = tap->ir_length;
 		field.out_value = calloc(CEIL(field.num_bits, 8), 1);
 		buf_set_u32(field.out_value, 0, field.num_bits, new_instr);
 		field.out_mask = NULL;
@@ -81,7 +80,7 @@ int virtex2_send_32(struct pld_device_s *pld_device, int num_words, u32 *words)

 	values = malloc(num_words * 4);

-	scan_field.device = virtex2_info->chain_pos;
+	scan_field.tap = virtex2_info->tap;
 	scan_field.num_bits = num_words * 32;
 	scan_field.out_value = values;
 	scan_field.out_mask = NULL;
@@ -94,7 +93,7 @@ int virtex2_send_32(struct pld_device_s *pld_device, int num_words, u32 *words)
 	for (i = 0; i < num_words; i++)
 		buf_set_u32(values + 4 * i, 0, 32, flip_u32(*words++, 32));

-	virtex2_set_instr(virtex2_info->chain_pos, 0x5); /* CFG_IN */
+	virtex2_set_instr(virtex2_info->tap, 0x5); /* CFG_IN */

 	jtag_add_dr_scan(1, &scan_field, TAP_PD);

@@ -115,7 +114,7 @@ int virtex2_receive_32(struct pld_device_s *pld_device, int num_words, u32 *word
 	virtex2_pld_device_t *virtex2_info = pld_device->driver_priv;
 	scan_field_t scan_field;

-	scan_field.device = virtex2_info->chain_pos;
+	scan_field.tap = virtex2_info->tap;
 	scan_field.num_bits = 32;
 	scan_field.out_value = NULL;
 	scan_field.out_mask = NULL;
@@ -124,7 +123,7 @@ int virtex2_receive_32(struct pld_device_s *pld_device, int num_words, u32 *word
 	scan_field.in_check_mask = NULL;
 	scan_field.in_handler = virtex2_jtag_buf_to_u32;

-	virtex2_set_instr(virtex2_info->chain_pos, 0x4); /* CFG_OUT */
+	virtex2_set_instr(virtex2_info->tap, 0x4); /* CFG_OUT */

 	while (num_words--)
 	{
@@ -166,7 +165,7 @@ int virtex2_load(struct pld_device_s *pld_device, char *filename)

 	scan_field_t field;

-	field.device = virtex2_info->chain_pos;
+	field.tap = virtex2_info->tap;
 	field.out_mask = NULL;
 	field.in_value = NULL;
 	field.in_check_value = NULL;
@@ -178,11 +177,11 @@ int virtex2_load(struct pld_device_s *pld_device, char *filename)
 		return retval;

 	jtag_add_end_state(TAP_RTI);
-	virtex2_set_instr(virtex2_info->chain_pos, 0xb); /* JPROG_B */
+	virtex2_set_instr(virtex2_info->tap, 0xb); /* JPROG_B */
 	jtag_execute_queue();
 	jtag_add_sleep(1000);

-	virtex2_set_instr(virtex2_info->chain_pos, 0x5); /* CFG_IN */
+	virtex2_set_instr(virtex2_info->tap, 0x5); /* CFG_IN */
 	jtag_execute_queue();

 	for (i = 0; i < bit_file.length; i++)
@@ -197,13 +196,13 @@ int virtex2_load(struct pld_device_s *pld_device, char *filename)
 	jtag_add_tlr();

 	jtag_add_end_state(TAP_RTI);
-	virtex2_set_instr(virtex2_info->chain_pos, 0xc); /* JSTART */
+	virtex2_set_instr(virtex2_info->tap, 0xc); /* JSTART */
 	jtag_add_runtest(13, TAP_RTI);
-	virtex2_set_instr(virtex2_info->chain_pos, 0x3f); /* BYPASS */
-	virtex2_set_instr(virtex2_info->chain_pos, 0x3f); /* BYPASS */
-	virtex2_set_instr(virtex2_info->chain_pos, 0xc); /* JSTART */
+	virtex2_set_instr(virtex2_info->tap, 0x3f); /* BYPASS */
+	virtex2_set_instr(virtex2_info->tap, 0x3f); /* BYPASS */
+	virtex2_set_instr(virtex2_info->tap, 0xc); /* JSTART */
 	jtag_add_runtest(13, TAP_RTI);
-	virtex2_set_instr(virtex2_info->chain_pos, 0x3f); /* BYPASS */
+	virtex2_set_instr(virtex2_info->tap, 0x3f); /* BYPASS */
 	jtag_execute_queue();

 	return ERROR_OK;
@@ -249,6 +248,8 @@ int virtex2_register_commands(struct command_context_s *cmd_ctx)

 int virtex2_pld_device_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct pld_device_s *pld_device)
 {
+	jtag_tap_t *tap;
+
 	virtex2_pld_device_t *virtex2_info;

 	if (argc < 2)
@@ -257,10 +258,15 @@ int virtex2_pld_device_command(struct command_context_s *cmd_ctx, char *cmd, cha
 		return ERROR_PLD_DEVICE_INVALID;
 	}

+	tap = jtag_TapByString( args[1] );
+	if( tap == NULL ){
+		command_print( cmd_ctx, "Tap: %s does not exist", args[1] );
+		return ERROR_OK;
+	}
+
 	virtex2_info = malloc(sizeof(virtex2_pld_device_t));
 	pld_device->driver_priv = virtex2_info;
-
-	virtex2_info->chain_pos = strtoul(args[1], NULL, 0);
+	virtex2_info->tap = tap;

 	return ERROR_OK;
 }
--- a/src/pld/virtex2.h
+++ b/src/pld/virtex2.h
@@ -20,12 +20,13 @@
 #ifndef VIRTEX2_H
 #define VIRTEX2_H

+#include "types.h"
 #include "pld.h"
 #include "xilinx_bit.h"

 typedef struct virtex2_pld_device_s
 {
-	int chain_pos;
+  jtag_tap_t *tap;
 } virtex2_pld_device_t;

 #endif /* VIRTEX2_H */
--- a/src/target/Makefile.am
+++ b/src/target/Makefile.am
@@ -19,27 +19,12 @@ noinst_HEADERS = target.h trace.h register.h armv4_5.h embeddedice.h etm.h arm7t
 	arm_disassembler.h arm966e.h arm926ejs.h etb.h xscale.h arm_simulator.h image.h armv7m.h cortex_m3.h cortex_swjdp.h \
 	etm_dummy.h oocd_trace.h target_request.h trace.h arm11.h mips32.h mips_m4k.h mips_ejtag.h mips32_pracc.h mips32_dmaacc.h

-nobase_dist_pkglib_DATA = xscale/debug_handler.bin target/at91eb40a.cfg \
-	target/at91r40008.cfg target/lpc2148.cfg target/lpc2148_rclk.cfg target/lpc2148_2mhz.cfg target/lpc2294.cfg \
-	target/sam7x256.cfg target/str710.cfg target/str912.cfg target/nslu2.cfg target/pxa255_sst.cfg \
-	target/pxa255.cfg  target/zy1000.cfg target/at91sam9260.cfg \
-	target/wi-9c.cfg target/stm32.cfg  target/xba_revA3.cfg \
-	ecos/at91eb40a.elf target/lm3s6965.cfg interface/parport.cfg \
-	interface/jtagkey-tiny.cfg interface/jtagkey.cfg interface/str9-comstick.cfg \
-	target/epc9301.cfg target/ipx42x.cfg target/lpc2129.cfg target/netx500.cfg \
-	target/omap5912.cfg target/pxa270.cfg target/str750.cfg target/str9comstick.cfg \
-	target/str730.cfg target/stm32stick.cfg \
-	target/lm3s811.cfg interface/luminary.cfg interface/luminary-libftdi.cfg interface/luminary-lm3s811.cfg \
-	target/imx31.cfg target/lm3s3748.cfg \
-	interface/stm32-stick.cfg interface/calao-usb-a9260-c01.cfg interface/calao-usb-a9260-c02.cfg \
-	interface/calao-usb-a9260.cfg target/at91sam9260minimal.cfg  \
-	interface/chameleon.cfg interface/at91rm9200.cfg interface/jlink.cfg interface/arm-usb-ocd.cfg \
-	interface/signalyzer.cfg target/eir-sam7se512.cfg \
-	interface/flyswatter.cfg target/hammer.cfg   \
-	interface/olimex-jtag-tiny-a.cfg \
-	target/pic32mx.cfg target/aduc702x.cfg interface/dummy.cfg interface/olimex-arm-usb-ocd.cfg target/s3c2440.cfg \
-	interface/openocd-usb.cfg target/test_syntax_error.cfg target/test_reset_syntax_error.cfg \
-	target/imx27.cfg
-	
-	
-
+nobase_dist_pkglib_DATA =
+nobase_dist_pkglib_DATA += xscale/debug_handler.bin 
+nobase_dist_pkglib_DATA += ecos/at91eb40a.elf
+# Various chip targets
+nobase_dist_pkglib_DATA += $(wildcard $(srcdir)/target/*.cfg)
+# Various jtag interfaces
+nobase_dist_pkglib_DATA += $(wildcard $(srcdir)/interface/*.cfg)
+# Various preconfigured boards
+nobase_dist_pkglib_DATA += $(wildcard $(srcdir)/board/*.cfg)
--- a/src/target/arm11.c
+++ b/src/target/arm11.c
@@ -1526,7 +1526,7 @@ int arm11_target_create(struct target_s *target, Jim_Interp *interp)
 	arm11->target = target;

 	/* prepare JTAG information for the new target */
-	arm11->jtag_info.chain_pos	= target->chain_position;
+	arm11->jtag_info.tap	= target->tap;
 	arm11->jtag_info.scann_size	= 5;

 	if((retval = arm_jtag_setup_connection(&arm11->jtag_info)) != ERROR_OK)
@@ -1534,13 +1534,12 @@ int arm11_target_create(struct target_s *target, Jim_Interp *interp)
 		return retval;
 	}

-	jtag_device_t *device = jtag_get_device(target->chain_position);
-	if (device==NULL)
+	if (target->tap==NULL)
 		return ERROR_FAIL;

-	if (device->ir_length != 5)
+	if (target->tap->ir_length != 5)
 	{
-		LOG_ERROR("'target arm11' expects 'jtag_device 5 0x01 0x1F 0x1E'");
+		LOG_ERROR("'target arm11' expects IR LENGTH = 5");
 		return ERROR_COMMAND_SYNTAX_ERROR;
 	}

@@ -1831,22 +1830,22 @@ const char arm11_mcr_syntax[] = "Syntax: mcr <jtag_target> <coprocessor> <opcode

 arm11_common_t * arm11_find_target(const char * arg)
 {
-	size_t jtag_target		= strtoul(arg, NULL, 0);
-
-	{target_t * t;
-	for (t = all_targets; t; t = t->next)
-	{
-		if (strcmp(t->type->name,"arm11"))
-		continue;
-
-	arm11_common_t * arm11 = t->arch_info;
-
-	if (arm11->jtag_info.chain_pos != jtag_target)
-		continue;
-
-	return arm11;
-	}}
+	jtag_tap_t *tap;
+	target_t * t;
+	
+	tap = jtag_TapByString( arg );
+	if( !tap ){
+		return NULL;
+	}

+	for (t = all_targets; t; t = t->next){
+		if( t->tap == tap ){
+			if( 0 == strcmp(t->type->name,"arm11")){
+				arm11_common_t * arm11 = t->arch_info;
+				return arm11;
+			}
+		}
+	}
 	return 0;
 }

--- a/src/target/arm11_dbgtap.c
+++ b/src/target/arm11_dbgtap.c
@@ -78,7 +78,7 @@ int arm11_add_dr_scan_vc(int num_fields, scan_field_t *fields, enum tap_state st
 */
 void arm11_setup_field(arm11_common_t * arm11, int num_bits, void * out_data, void * in_data, scan_field_t * field)
 {
-    field->device		= arm11->jtag_info.chain_pos;
+    field->tap   		= arm11->jtag_info.tap;
    field->num_bits		= num_bits;
    field->out_mask		= NULL;
    field->in_check_mask	= NULL;
@@ -101,16 +101,17 @@ void arm11_setup_field(arm11_common_t * arm11, int num_bits, void * out_data, vo
 */
 void arm11_add_IR(arm11_common_t * arm11, u8 instr, enum tap_state state)
 {
-    jtag_device_t *device = jtag_get_device(arm11->jtag_info.chain_pos);
-    if (device==NULL)
-    {
+	jtag_tap_t *tap;
+	tap = arm11->jtag_info.tap;
+	if(  tap == NULL ){
    	/* FIX!!!! error is logged, but not propagated back up the call stack... */
+		LOG_ERROR( "tap is null here! This is bad!");
+		return;
    }

-    if (buf_get_u32(device->cur_instr, 0, 5) == instr)
-    {
-	JTAG_DEBUG("IR <= 0x%02x SKIPPED", instr);
-	return;
+    if (buf_get_u32(tap->cur_instr, 0, 5) == instr){
+		JTAG_DEBUG("IR <= 0x%02x SKIPPED", instr);
+		return;
    }

    JTAG_DEBUG("IR <= 0x%02x", instr);
--- a/src/target/arm720t.c
+++ b/src/target/arm720t.c
@@ -109,7 +109,7 @@ int arm720t_scan_cp15(target_t *target, u32 out, u32 *in, int instruction, int c
 		return retval;
 	}
 		
-	fields[0].device = jtag_info->chain_pos;
+	fields[0].tap = jtag_info->tap;
 	fields[0].num_bits = 1;
 	fields[0].out_value = &instruction_buf;
 	fields[0].out_mask = NULL;
@@ -119,7 +119,7 @@ int arm720t_scan_cp15(target_t *target, u32 out, u32 *in, int instruction, int c
 	fields[0].in_handler = NULL;
 	fields[0].in_handler_priv = NULL;

-	fields[1].device = jtag_info->chain_pos;
+	fields[1].tap = jtag_info->tap;
 	fields[1].num_bits = 32;
 	fields[1].out_value = out_buf;
 	fields[1].out_mask = NULL;
@@ -456,12 +456,12 @@ int arm720t_quit(void)
 	return ERROR_OK;
 }

-int arm720t_init_arch_info(target_t *target, arm720t_common_t *arm720t, int chain_pos, const char *variant)
+int arm720t_init_arch_info(target_t *target, arm720t_common_t *arm720t, jtag_tap_t *tap, const char *variant)
 {
 	arm7tdmi_common_t *arm7tdmi = &arm720t->arm7tdmi_common;
 	arm7_9_common_t *arm7_9 = &arm7tdmi->arm7_9_common;
 	
-	arm7tdmi_init_arch_info(target, arm7tdmi, chain_pos, variant);
+	arm7tdmi_init_arch_info(target, arm7tdmi, tap, variant);

 	arm7tdmi->arch_info = arm720t;
 	arm720t->common_magic = ARM720T_COMMON_MAGIC;
@@ -485,7 +485,7 @@ int arm720t_target_create(struct target_s *target, Jim_Interp *interp)
 {
 	arm720t_common_t *arm720t = calloc(1,sizeof(arm720t_common_t));
 	
-	arm720t_init_arch_info(target, arm720t, target->chain_position, target->variant);
+	arm720t_init_arch_info(target, arm720t, target->tap, target->variant);

 	return ERROR_OK;
 }
--- a/src/target/arm7_9_common.c
+++ b/src/target/arm7_9_common.c
@@ -2349,9 +2349,10 @@ static int arm7_9_dcc_completion(struct target_s *target, u32 exit_point, int ti

 		embeddedice_reg_t *ice_reg = arm7_9->eice_cache->reg_list[EICE_COMMS_DATA].arch_info;
 		u8 reg_addr = ice_reg->addr & 0x1f;
-		int chain_pos = ice_reg->jtag_info->chain_pos;
+		jtag_tap_t *tap;
+		tap = ice_reg->jtag_info->tap;

-		embeddedice_write_dcc(chain_pos, reg_addr, buffer, little, count-2);
+		embeddedice_write_dcc(tap, reg_addr, buffer, little, count-2);
 		buffer += (count-2)*4;

 		embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], fast_target_buffer_get_u32(buffer, little));
--- a/src/target/arm7tdmi.c
+++ b/src/target/arm7tdmi.c
@@ -112,7 +112,7 @@ int arm7tdmi_examine_debug_reason(target_t *target)
 		
 		jtag_add_end_state(TAP_PD);

-		fields[0].device = arm7_9->jtag_info.chain_pos;
+		fields[0].tap = arm7_9->jtag_info.tap;
 		fields[0].num_bits = 1;
 		fields[0].out_value = NULL;
 		fields[0].out_mask = NULL;
@@ -122,7 +122,7 @@ int arm7tdmi_examine_debug_reason(target_t *target)
 		fields[0].in_handler = NULL;
 		fields[0].in_handler_priv = NULL;
 		
-		fields[1].device = arm7_9->jtag_info.chain_pos;
+		fields[1].tap = arm7_9->jtag_info.tap;
 		fields[1].num_bits = 32;
 		fields[1].out_value = NULL;
 		fields[1].out_mask = NULL;
@@ -165,7 +165,7 @@ static __inline int arm7tdmi_clock_out_inner(arm_jtag_t *jtag_info, u32 out, int
 {
 	u32 values[2]={breakpoint, flip_u32(out, 32)};
 			
-	jtag_add_dr_out(jtag_info->chain_pos, 
+	jtag_add_dr_out(jtag_info->tap,
 			2,
 			arm7tdmi_num_bits,
 			values,
@@ -199,7 +199,7 @@ int arm7tdmi_clock_data_in(arm_jtag_t *jtag_info, u32 *in)
 	}
 	arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 	
-	fields[0].device = jtag_info->chain_pos;
+	fields[0].tap = jtag_info->tap;
 	fields[0].num_bits = 1;
 	fields[0].out_value = NULL;
 	fields[0].out_mask = NULL;
@@ -209,7 +209,7 @@ int arm7tdmi_clock_data_in(arm_jtag_t *jtag_info, u32 *in)
 	fields[0].in_handler = NULL;
 	fields[0].in_handler_priv = NULL;
 		
-	fields[1].device = jtag_info->chain_pos;
+	fields[1].tap = jtag_info->tap;
 	fields[1].num_bits = 32;
 	fields[1].out_value = NULL;
 	fields[1].out_mask = NULL;
@@ -260,7 +260,7 @@ int arm7tdmi_clock_data_in_endianness(arm_jtag_t *jtag_info, void *in, int size,
 	}
 	arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 	
-	fields[0].device = jtag_info->chain_pos;
+	fields[0].tap = jtag_info->tap;
 	fields[0].num_bits = 1;
 	fields[0].out_value = NULL;
 	fields[0].out_mask = NULL;
@@ -270,7 +270,7 @@ int arm7tdmi_clock_data_in_endianness(arm_jtag_t *jtag_info, void *in, int size,
 	fields[0].in_handler = NULL;
 	fields[0].in_handler_priv = NULL;
 		
-	fields[1].device = jtag_info->chain_pos;
+	fields[1].tap = jtag_info->tap;
 	fields[1].num_bits = 32;
 	fields[1].out_value = NULL;
 	fields[1].out_mask = NULL;
@@ -784,7 +784,7 @@ int arm7tdmi_quit(void)
 	return ERROR_OK;
 }

-int arm7tdmi_init_arch_info(target_t *target, arm7tdmi_common_t *arm7tdmi, int chain_pos, const char *variant)
+int arm7tdmi_init_arch_info(target_t *target, arm7tdmi_common_t *arm7tdmi, jtag_tap_t *tap, const char *variant)
 {
 	armv4_5_common_t *armv4_5;
 	arm7_9_common_t *arm7_9;
@@ -793,7 +793,7 @@ int arm7tdmi_init_arch_info(target_t *target, arm7tdmi_common_t *arm7tdmi, int c
 	armv4_5 = &arm7_9->armv4_5_common;
 	
 	/* prepare JTAG information for the new target */
-	arm7_9->jtag_info.chain_pos = chain_pos;
+	arm7_9->jtag_info.tap = tap;
 	arm7_9->jtag_info.scann_size = 4;
 	
 	/* register arch-specific functions */
@@ -860,7 +860,7 @@ int arm7tdmi_target_create( struct target_s *target, Jim_Interp *interp )
 	
 	arm7tdmi = calloc(1,sizeof(arm7tdmi_common_t));
 	
-	arm7tdmi_init_arch_info(target, arm7tdmi, target->chain_position, target->variant);
+	arm7tdmi_init_arch_info(target, arm7tdmi, target->tap, target->variant);
 	
 	return ERROR_OK;
 }
--- a/src/target/arm7tdmi.h
+++ b/src/target/arm7tdmi.h
@@ -41,7 +41,7 @@ typedef struct arm7tdmi_common_s
 } arm7tdmi_common_t;

 int arm7tdmi_register_commands(struct command_context_s *cmd_ctx);
-int arm7tdmi_init_arch_info(target_t *target, arm7tdmi_common_t *arm7tdmi, int chain_pos, const char *variant);
+int arm7tdmi_init_arch_info(target_t *target, arm7tdmi_common_t *arm7tdmi, jtag_tap_t *tap, const char *variant);
 int arm7tdmi_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
 int arm7tdmi_examine(struct target_s *target);

--- a/src/target/arm920t.c
+++ b/src/target/arm920t.c
@@ -110,7 +110,7 @@ int arm920t_read_cp15_physical(target_t *target, int reg_addr, u32 *value)
 	arm_jtag_scann(jtag_info, 0xf);
 	arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);

-	fields[0].device = jtag_info->chain_pos;
+	fields[0].tap = jtag_info->tap;
 	fields[0].num_bits = 1;
 	fields[0].out_value = &access_type_buf;
 	fields[0].out_mask = NULL;
@@ -120,7 +120,7 @@ int arm920t_read_cp15_physical(target_t *target, int reg_addr, u32 *value)
 	fields[0].in_handler = NULL;
 	fields[0].in_handler_priv = NULL;

-	fields[1].device = jtag_info->chain_pos;
+	fields[1].tap = jtag_info->tap;
 	fields[1].num_bits = 32;
 	fields[1].out_value = NULL;
 	fields[1].out_mask = NULL;
@@ -130,7 +130,7 @@ int arm920t_read_cp15_physical(target_t *target, int reg_addr, u32 *value)
 	fields[1].in_handler = NULL;
 	fields[1].in_handler_priv = NULL;

-	fields[2].device = jtag_info->chain_pos;
+	fields[2].tap = jtag_info->tap;
 	fields[2].num_bits = 6;
 	fields[2].out_value = &reg_addr_buf;
 	fields[2].out_mask = NULL;
@@ -140,7 +140,7 @@ int arm920t_read_cp15_physical(target_t *target, int reg_addr, u32 *value)
 	fields[2].in_handler = NULL;
 	fields[2].in_handler_priv = NULL;

-	fields[3].device = jtag_info->chain_pos;
+	fields[3].tap = jtag_info->tap;
 	fields[3].num_bits = 1;
 	fields[3].out_value = &nr_w_buf;
 	fields[3].out_mask = NULL;
@@ -182,7 +182,7 @@ int arm920t_write_cp15_physical(target_t *target, int reg_addr, u32 value)
 	arm_jtag_scann(jtag_info, 0xf);
 	arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);

-	fields[0].device = jtag_info->chain_pos;
+	fields[0].tap = jtag_info->tap;
 	fields[0].num_bits = 1;
 	fields[0].out_value = &access_type_buf;
 	fields[0].out_mask = NULL;
@@ -192,7 +192,7 @@ int arm920t_write_cp15_physical(target_t *target, int reg_addr, u32 value)
 	fields[0].in_handler = NULL;
 	fields[0].in_handler_priv = NULL;

-	fields[1].device = jtag_info->chain_pos;
+	fields[1].tap = jtag_info->tap;
 	fields[1].num_bits = 32;
 	fields[1].out_value = value_buf;
 	fields[1].out_mask = NULL;
@@ -202,7 +202,7 @@ int arm920t_write_cp15_physical(target_t *target, int reg_addr, u32 value)
 	fields[1].in_handler = NULL;
 	fields[1].in_handler_priv = NULL;

-	fields[2].device = jtag_info->chain_pos;
+	fields[2].tap = jtag_info->tap;
 	fields[2].num_bits = 6;
 	fields[2].out_value = &reg_addr_buf;
 	fields[2].out_mask = NULL;
@@ -212,7 +212,7 @@ int arm920t_write_cp15_physical(target_t *target, int reg_addr, u32 value)
 	fields[2].in_handler = NULL;
 	fields[2].in_handler_priv = NULL;

-	fields[3].device = jtag_info->chain_pos;
+	fields[3].tap = jtag_info->tap;
 	fields[3].num_bits = 1;
 	fields[3].out_value = &nr_w_buf;
 	fields[3].out_mask = NULL;
@@ -249,7 +249,7 @@ int arm920t_execute_cp15(target_t *target, u32 cp15_opcode, u32 arm_opcode)
 	
 	buf_set_u32(cp15_opcode_buf, 0, 32, cp15_opcode);

-	fields[0].device = jtag_info->chain_pos;
+	fields[0].tap = jtag_info->tap;
 	fields[0].num_bits = 1;
 	fields[0].out_value = &access_type_buf;
 	fields[0].out_mask = NULL;
@@ -259,7 +259,7 @@ int arm920t_execute_cp15(target_t *target, u32 cp15_opcode, u32 arm_opcode)
 	fields[0].in_handler = NULL;
 	fields[0].in_handler_priv = NULL;

-	fields[1].device = jtag_info->chain_pos;
+	fields[1].tap = jtag_info->tap;
 	fields[1].num_bits = 32;
 	fields[1].out_value = cp15_opcode_buf;
 	fields[1].out_mask = NULL;
@@ -269,7 +269,7 @@ int arm920t_execute_cp15(target_t *target, u32 cp15_opcode, u32 arm_opcode)
 	fields[1].in_handler = NULL;
 	fields[1].in_handler_priv = NULL;

-	fields[2].device = jtag_info->chain_pos;
+	fields[2].tap = jtag_info->tap;
 	fields[2].num_bits = 6;
 	fields[2].out_value = &reg_addr_buf;
 	fields[2].out_mask = NULL;
@@ -279,7 +279,7 @@ int arm920t_execute_cp15(target_t *target, u32 cp15_opcode, u32 arm_opcode)
 	fields[2].in_handler = NULL;
 	fields[2].in_handler_priv = NULL;

-	fields[3].device = jtag_info->chain_pos;
+	fields[3].tap = jtag_info->tap;
 	fields[3].num_bits = 1;
 	fields[3].out_value = &nr_w_buf;
 	fields[3].out_mask = NULL;
@@ -712,14 +712,14 @@ int arm920t_quit(void)
 	return ERROR_OK;
 }

-int arm920t_init_arch_info(target_t *target, arm920t_common_t *arm920t, int chain_pos, const char *variant)
+int arm920t_init_arch_info(target_t *target, arm920t_common_t *arm920t, jtag_tap_t *tap, const char *variant)
 {
 	arm9tdmi_common_t *arm9tdmi = &arm920t->arm9tdmi_common;
 	arm7_9_common_t *arm7_9 = &arm9tdmi->arm7_9_common;
 	
 	/* initialize arm9tdmi specific info (including arm7_9 and armv4_5)
 	 */
-	arm9tdmi_init_arch_info(target, arm9tdmi, chain_pos, variant);
+	arm9tdmi_init_arch_info(target, arm9tdmi, tap, variant);

 	arm9tdmi->arch_info = arm920t;
 	arm920t->common_magic = ARM920T_COMMON_MAGIC;
@@ -752,7 +752,7 @@ int arm920t_target_create(struct target_s *target, Jim_Interp *interp)
 {
 	arm920t_common_t *arm920t = calloc(1,sizeof(arm920t_common_t));
 	
-	arm920t_init_arch_info(target, arm920t, target->chain_position, target->variant);
+	arm920t_init_arch_info(target, arm920t, target->tap, target->variant);

 	return ERROR_OK;
 }
--- a/src/target/arm926ejs.c
+++ b/src/target/arm926ejs.c
@@ -139,7 +139,7 @@ int arm926ejs_cp15_read(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u3
 	}
 	arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);

-	fields[0].device = jtag_info->chain_pos;
+	fields[0].tap = jtag_info->tap;
 	fields[0].num_bits = 32;
 	fields[0].out_value = NULL;
 	fields[0].out_mask = NULL;
@@ -149,7 +149,7 @@ int arm926ejs_cp15_read(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u3
 	fields[0].in_handler = NULL;
 	fields[0].in_handler_priv = NULL;

-	fields[1].device = jtag_info->chain_pos;
+	fields[1].tap = jtag_info->tap;
 	fields[1].num_bits = 1;
 	fields[1].out_value = &access;
 	fields[1].out_mask = NULL;
@@ -159,7 +159,7 @@ int arm926ejs_cp15_read(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u3
 	fields[1].in_handler = NULL;
 	fields[1].in_handler_priv = NULL;

-	fields[2].device = jtag_info->chain_pos;
+	fields[2].tap = jtag_info->tap;
 	fields[2].num_bits = 14;
 	fields[2].out_value = address_buf;
 	fields[2].out_mask = NULL;
@@ -169,7 +169,7 @@ int arm926ejs_cp15_read(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u3
 	fields[2].in_handler = NULL;
 	fields[2].in_handler_priv = NULL;

-	fields[3].device = jtag_info->chain_pos;
+	fields[3].tap = jtag_info->tap;
 	fields[3].num_bits = 1;
 	fields[3].out_value = &nr_w_buf;
 	fields[3].out_mask = NULL;
@@ -229,7 +229,7 @@ int arm926ejs_cp15_write(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u
 	}
 	arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);

-	fields[0].device = jtag_info->chain_pos;
+	fields[0].tap = jtag_info->tap;
 	fields[0].num_bits = 32;
 	fields[0].out_value = value_buf;
 	fields[0].out_mask = NULL;
@@ -239,7 +239,7 @@ int arm926ejs_cp15_write(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u
 	fields[0].in_handler = NULL;
 	fields[0].in_handler_priv = NULL;

-	fields[1].device = jtag_info->chain_pos;
+	fields[1].tap = jtag_info->tap;
 	fields[1].num_bits = 1;
 	fields[1].out_value = &access;
 	fields[1].out_mask = NULL;
@@ -249,7 +249,7 @@ int arm926ejs_cp15_write(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u
 	fields[1].in_handler = NULL;
 	fields[1].in_handler_priv = NULL;

-	fields[2].device = jtag_info->chain_pos;
+	fields[2].tap = jtag_info->tap;
 	fields[2].num_bits = 14;
 	fields[2].out_value = address_buf;
 	fields[2].out_mask = NULL;
@@ -259,7 +259,7 @@ int arm926ejs_cp15_write(target_t *target, u32 op1, u32 op2, u32 CRn, u32 CRm, u
 	fields[2].in_handler = NULL;
 	fields[2].in_handler_priv = NULL;

-	fields[3].device = jtag_info->chain_pos;
+	fields[3].tap = jtag_info->tap;
 	fields[3].num_bits = 1;
 	fields[3].out_value = &nr_w_buf;
 	fields[3].out_mask = NULL;
@@ -714,14 +714,14 @@ int arm926ejs_quit(void)
 	return ERROR_OK;
 }

-int arm926ejs_init_arch_info(target_t *target, arm926ejs_common_t *arm926ejs, int chain_pos, const char *variant)
+int arm926ejs_init_arch_info(target_t *target, arm926ejs_common_t *arm926ejs, jtag_tap_t *tap, const char *variant)
 {
 	arm9tdmi_common_t *arm9tdmi = &arm926ejs->arm9tdmi_common;
 	arm7_9_common_t *arm7_9 = &arm9tdmi->arm7_9_common;

 	/* initialize arm9tdmi specific info (including arm7_9 and armv4_5)
 	 */
-	arm9tdmi_init_arch_info(target, arm9tdmi, chain_pos, variant);
+	arm9tdmi_init_arch_info(target, arm9tdmi, tap, variant);

 	arm9tdmi->arch_info = arm926ejs;
 	arm926ejs->common_magic = ARM926EJS_COMMON_MAGIC;
@@ -755,7 +755,7 @@ int arm926ejs_target_create(struct target_s *target, Jim_Interp *interp)
 {
 	arm926ejs_common_t *arm926ejs = calloc(1,sizeof(arm926ejs_common_t));

-	arm926ejs_init_arch_info(target, arm926ejs, target->chain_position, target->variant);
+	arm926ejs_init_arch_info(target, arm926ejs, target->tap, target->variant);

 	return ERROR_OK;
 }
--- a/src/target/arm926ejs.h
+++ b/src/target/arm926ejs.h
@@ -43,7 +43,7 @@ typedef struct arm926ejs_common_s
 	u32 d_far;
 } arm926ejs_common_t;

-extern int arm926ejs_init_arch_info(target_t *target, arm926ejs_common_t *arm926ejs, int chain_pos, const char *variant);
+extern int arm926ejs_init_arch_info(target_t *target, arm926ejs_common_t *arm926ejs, jtag_tap_t *tap, const char *variant);
 extern int arm926ejs_register_commands(struct command_context_s *cmd_ctx); 
 extern int arm926ejs_arch_state(struct target_s *target); 
 extern int arm926ejs_write_memory(struct target_s *target, u32 address, u32 size, u32 count, u8 *buffer); 
--- a/src/target/arm966e.c
+++ b/src/target/arm966e.c
@@ -102,12 +102,12 @@ int arm966e_quit(void)
 	return ERROR_OK;
 }

-int arm966e_init_arch_info(target_t *target, arm966e_common_t *arm966e, int chain_pos, const char *variant)
+int arm966e_init_arch_info(target_t *target, arm966e_common_t *arm966e, jtag_tap_t *tap, const char *variant)
 {
 	arm9tdmi_common_t *arm9tdmi = &arm966e->arm9tdmi_common;
 	arm7_9_common_t *arm7_9 = &arm9tdmi->arm7_9_common;
 	
-	arm9tdmi_init_arch_info(target, arm9tdmi, chain_pos, variant);
+	arm9tdmi_init_arch_info(target, arm9tdmi, tap, variant);

 	arm9tdmi->arch_info = arm966e;
 	arm966e->common_magic = ARM966E_COMMON_MAGIC;
@@ -125,7 +125,7 @@ int arm966e_target_create( struct target_s *target, Jim_Interp *interp )
 {
 	arm966e_common_t *arm966e = calloc(1,sizeof(arm966e_common_t));
 	
-	arm966e_init_arch_info(target, arm966e, target->chain_position, target->variant);
+	arm966e_init_arch_info(target, arm966e, target->tap, target->variant);

 	return ERROR_OK;
 }
@@ -185,7 +185,7 @@ int arm966e_read_cp15(target_t *target, int reg_addr, u32 *value)
 	}
 	arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);

-	fields[0].device = jtag_info->chain_pos;
+	fields[0].tap = jtag_info->tap;
 	fields[0].num_bits = 32;
 	fields[0].out_value = NULL;
 	fields[0].out_mask = NULL;
@@ -195,7 +195,7 @@ int arm966e_read_cp15(target_t *target, int reg_addr, u32 *value)
 	fields[0].in_handler = NULL;
 	fields[0].in_handler_priv = NULL;

-	fields[1].device = jtag_info->chain_pos;
+	fields[1].tap = jtag_info->tap;
 	fields[1].num_bits = 6;
 	fields[1].out_value = &reg_addr_buf;
 	fields[1].out_mask = NULL;
@@ -205,7 +205,7 @@ int arm966e_read_cp15(target_t *target, int reg_addr, u32 *value)
 	fields[1].in_handler = NULL;
 	fields[1].in_handler_priv = NULL;

-	fields[2].device = jtag_info->chain_pos;
+	fields[2].tap = jtag_info->tap;
 	fields[2].num_bits = 1;
 	fields[2].out_value = &nr_w_buf;
 	fields[2].out_mask = NULL;
@@ -253,7 +253,7 @@ int arm966e_write_cp15(target_t *target, int reg_addr, u32 value)
 	}
 	arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);

-	fields[0].device = jtag_info->chain_pos;
+	fields[0].tap = jtag_info->tap;
 	fields[0].num_bits = 32;
 	fields[0].out_value = value_buf;
 	fields[0].out_mask = NULL;
@@ -263,7 +263,7 @@ int arm966e_write_cp15(target_t *target, int reg_addr, u32 value)
 	fields[0].in_handler = NULL;
 	fields[0].in_handler_priv = NULL;

-	fields[1].device = jtag_info->chain_pos;
+	fields[1].tap = jtag_info->tap;
 	fields[1].num_bits = 6;
 	fields[1].out_value = &reg_addr_buf;
 	fields[1].out_mask = NULL;
@@ -273,7 +273,7 @@ int arm966e_write_cp15(target_t *target, int reg_addr, u32 value)
 	fields[1].in_handler = NULL;
 	fields[1].in_handler_priv = NULL;

-	fields[2].device = jtag_info->chain_pos;
+	fields[2].tap = jtag_info->tap;
 	fields[2].num_bits = 1;
 	fields[2].out_value = &nr_w_buf;
 	fields[2].out_mask = NULL;
--- a/Show More
+++ b/Show More