NEWTAPS

   1 Reporting Unknown JTAG TAP IDS
   2 ------------------------------
   3
   4 If OpenOCD reports an UNKNOWN or Unexpected Tap ID please report it to
   5 the development mailing list - However - keep reading.
   6
   7 openocd-development@lists.berlios.de.
   8
   9 ========================================
  10
  11 About "UNEXPECTED" tap ids.
  12
  13   Before reporting an "UNEXPECTED TAP ID" - take a closer look.
  14   Perhaps you have your OpenOCD configured the wrong way, maybe you
  15   have the tap configured the wrong way? Or something else is wrong.
  16   (Remember: OpenOCD does not stop if the tap is not present)
  17
  18   This "tap id check" is there for a purpose.
  19   The goal is to help get the *right* configuration.
  20
  21 The idea is this:
  22
  23   Every JTAG tap is suppose to have "a unique 32bit tap id" number.
  24   They are suppose to be "sort of unique" but they are not.  There are
  25   no guarantees.
  26
  27 Version Number Changes:
  28
  29   Sometimes, the tap ID only differs by VERSION number. If so - it's
  30   not a big deal.  Please do report this information.  We'd like to
  31   know about it.
  32
  33   For example
  34
  35 Error:  ERROR: Tap: s3c4510.cpu - Expected id: 0x3f0f0f0f, Got: 0x1f0f0f0f
  36 Error:  ERROR: expected: mfg: 0x787, part: 0xf0f0, ver: 0x3
  37 Error:  ERROR:      got: mfg: 0x787, part: 0xf0f0, ver: 0x1
  38
  39 ========================================
  40
  41 Updating the Tap ID number your self
  42
  43   Why do this? You just want the warning to go away.  And don't want
  44   to update your version/instance of OpenOCD.
  45
  46   On simple systems, to fix this problem, in your "openocd.cfg" file,
  47   override the tap id.  Depending on the tap, add one of these 3
  48   commands:
  49
  50         set CPUTAPID   newvalue
  51   or    set BSTAPID    newvalue
  52   or    set FLASHTAPID newvalue
  53   or    set ETMTAPID   newvalue
  54
  55   Where "newvalue" is the new value you are seeing.
  56
  57   On complex systems, (with many taps and chips) you probably have a
  58   custom configuration file. Its is more complicated, you're going to
  59   have to read through the configuration files
  60
  61 ========================================
  62
  63 What to send:
  64
  65 Cut & paste the output of OpenOCD that pointed you at this file.
  66
  67 Please include the VERSION number of OpenOCD you are using.
  68
  69 And please include the information below.
  70
  71 ========================================
  72
  73 A) The JTAG TAP ID code.
  74
  75 This is always a 32bit hex number.
  76
  77 Examples:
  78     0x1f0f0f0f - is an old ARM7TDMI
  79     0x3f0f0f0f - is a newer ARM7TDMI
  80     0x3ba00477 - is an ARM cortex M3
  81
  82 Some chips have multiple JTAG taps - be sure to list
  83 each one individually - ORDER is important!
  84
  85 ========================================
  86 B) The maker of the part
  87
  88 Examples:
  89     Xilinx, Atmel, ST Micro Systems, Freescale
  90
  91 ========================================
  92 C) The family of parts it belongs to
  93
  94 Examples:
  95    "NXP LPC Series"
  96    "Atmel SAM7 Series"
  97
  98 ========================================
  99
 100 D) The actual part number on the package
 101
 102    For example: "S3C45101x01"
 103
 104 ========================================
 105
 106 E) What type of board it is.
 107
 108 ie: a "commercial off the self eval board" that one can purchase (as
 109 opposed to your private internal custom board)
 110
 111 For example: ST Micro systems has Eval boards, so does Analog Devices
 112
 113 Or - if it is inside something "hackers like to hack" that information
 114 is helpful too.
 115
 116 For example: A consumer GPS unit or a cellphone
 117
 118 ========================================
 119
 120 (F)   The maker of the board
 121         ie: Olimex, LogicPD, Freescale(eval board)
 122
 123 ========================================
 124
 125 (G)   Identifying information on the board.
 126
 127       Not good:   "iar red ST eval board"
 128
 129       Really good: "IAR STR912-SK evaluation board"
 130
 131 ========================================
 132
 133 (H) Are there other interesting (JTAG) chips on the board?
 134
 135     ie: An FPGA or CPLD ...
 136
 137 ========================================
 138
 139 (I) What target config files need updating?
 140
 141     In fact it's best if you submit a patch with those
 142     updates.  Most of the other information listed here
 143     is just to help create a good patch.
 144
 145 ========================================