README.mpc8349emds.ddrecc 4.5 KB

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  1. Overview
  2. ========
  3. The overall usage pattern for ECC diagnostic commands is the following:
  4. * (injecting errors is initially disabled)
  5. * define inject mask (which tells the DDR controller what type of errors
  6. we'll be injecting: single/multiple bit etc.)
  7. * enable injecting errors - from now on the controller injects errors as
  8. indicated in the inject mask
  9. IMPORTANT NOTICE: enabling injecting multiple-bit errors is potentially
  10. dangerous as such errors are NOT corrected by the controller. Therefore caution
  11. should be taken when enabling the injection of multiple-bit errors: it is only
  12. safe when used on a carefully selected memory area and used under control of
  13. the 'ecc test' command (see example 'Injecting Multiple-Bit Errors' below). In
  14. particular, when you simply set the multiple-bit errors in inject mask and
  15. enable injection, U-Boot is very likely to hang quickly as the errors will be
  16. injected when it accesses its code, data etc.
  17. Use cases for DDR 'ecc' command:
  18. ================================
  19. Before executing particular tests reset target board or clear status registers:
  20. => ecc captureclear
  21. => ecc errdetectclr all
  22. => ecc sbecnt 0
  23. Injecting Single-Bit Errors
  24. ---------------------------
  25. 1. Set 1 bit in Data Path Error Inject Mask
  26. => ecc injectdatahi 1
  27. 2. Run test over some memory region
  28. => ecc test 200000 10
  29. 3. Check ECC status
  30. => ecc status
  31. ...
  32. Memory Data Path Error Injection Mask High/Low: 00000001 00000000
  33. ...
  34. Memory Single-Bit Error Management (0..255):
  35. Single-Bit Error Threshold: 255
  36. Single Bit Error Counter: 16
  37. ...
  38. Memory Error Detect:
  39. Multiple Memory Errors: 0
  40. Multiple-Bit Error: 0
  41. Single-Bit Error: 0
  42. ...
  43. 16 errors were generated, Single-Bit Error flag was not set as Single Bit Error
  44. Counter did not reach Single-Bit Error Threshold.
  45. 4. Make sure used memory region got re-initialized with 0xcafecafe pattern
  46. => md 200000
  47. 00200000: cafecafe cafecafe cafecafe cafecafe ................
  48. 00200010: cafecafe cafecafe cafecafe cafecafe ................
  49. 00200020: cafecafe cafecafe cafecafe cafecafe ................
  50. 00200030: cafecafe cafecafe cafecafe cafecafe ................
  51. 00200040: cafecafe cafecafe cafecafe cafecafe ................
  52. 00200050: cafecafe cafecafe cafecafe cafecafe ................
  53. 00200060: cafecafe cafecafe cafecafe cafecafe ................
  54. 00200070: cafecafe cafecafe cafecafe cafecafe ................
  55. 00200080: deadbeef deadbeef deadbeef deadbeef ................
  56. 00200090: deadbeef deadbeef deadbeef deadbeef ................
  57. Injecting Multiple-Bit Errors
  58. -----------------------------
  59. 1. Set more than 1 bit in Data Path Error Inject Mask
  60. => ecc injectdatahi 5
  61. 2. Run test over some memory region
  62. => ecc test 200000 10
  63. 3. Check ECC status
  64. => ecc status
  65. ...
  66. Memory Data Path Error Injection Mask High/Low: 00000005 00000000
  67. ...
  68. Memory Error Detect:
  69. Multiple Memory Errors: 1
  70. Multiple-Bit Error: 1
  71. Single-Bit Error: 0
  72. ...
  73. Observe that both Multiple Memory Errors and Multiple-Bit Error flags are set.
  74. 4. Make sure used memory region got re-initialized with 0xcafecafe pattern
  75. => md 200000
  76. 00200000: cafecafe cafecafe cafecafe cafecafe ................
  77. 00200010: cafecafe cafecafe cafecafe cafecafe ................
  78. 00200020: cafecafe cafecafe cafecafe cafecafe ................
  79. 00200030: cafecafe cafecafe cafecafe cafecafe ................
  80. 00200040: cafecafe cafecafe cafecafe cafecafe ................
  81. 00200050: cafecafe cafecafe cafecafe cafecafe ................
  82. 00200060: cafecafe cafecafe cafecafe cafecafe ................
  83. 00200070: cafecafe cafecafe cafecafe cafecafe ................
  84. 00200080: deadbeef deadbeef deadbeef deadbeef ................
  85. 00200090: deadbeef deadbeef deadbeef deadbeef ................
  86. Test Single-Bit Error Counter and Threshold
  87. -------------------------------------------
  88. 1. Set 1 bit in Data Path Error Inject Mask
  89. => ecc injectdatahi 1
  90. 2. Enable error injection
  91. => ecc inject en
  92. 3. Let u-boot run for a with Single-Bit error injection enabled
  93. 4. Disable error injection
  94. => ecc inject dis
  95. 4. Check status
  96. => ecc status
  97. ...
  98. Memory Single-Bit Error Management (0..255):
  99. Single-Bit Error Threshold: 255
  100. Single Bit Error Counter: 60
  101. Memory Error Detect:
  102. Multiple Memory Errors: 1
  103. Multiple-Bit Error: 0
  104. Single-Bit Error: 1
  105. ...
  106. Observe that Single-Bit Error is 'on' which means that Single-Bit Error Counter
  107. reached Single-Bit Error Threshold. Multiple Memory Errors bit is also 'on', that
  108. is Counter reached Threshold more than one time (it wraps back after reaching
  109. Threshold).