Commit | Line | Data |
---|---|---|
d326f4a2 MB |
1 | |
2 | ||
3 | Use cases for DDR 'ecc' command: | |
4 | ================================ | |
5 | ||
6 | Before executing particular tests reset target board or clear status registers: | |
7 | ||
8 | => ecc captureclear | |
9 | => ecc errdetectclr all | |
10 | => ecc sbecnt 0 | |
11 | ||
12 | ||
13 | Injecting Single-Bit Errors | |
14 | --------------------------- | |
15 | ||
16 | 1. Set 1 bit in Data Path Error Inject Mask | |
17 | ||
18 | => ecc injectdatahi 1 | |
19 | ||
20 | 2. Run test over some memory region | |
21 | ||
22 | => ecc test 200000 10 | |
23 | ||
24 | 3. Check ECC status | |
25 | ||
26 | => ecc status | |
27 | ... | |
28 | Memory Data Path Error Injection Mask High/Low: 00000001 00000000 | |
29 | ... | |
30 | Memory Single-Bit Error Management (0..255): | |
31 | Single-Bit Error Threshold: 255 | |
32 | Single Bit Error Counter: 16 | |
33 | ... | |
34 | Memory Error Detect: | |
35 | Multiple Memory Errors: 0 | |
36 | Multiple-Bit Error: 0 | |
37 | Single-Bit Error: 0 | |
38 | ... | |
39 | ||
40 | 16 errors were generated, Single-Bit Error flag was not set as Single Bit Error | |
41 | Counter did not reach Single-Bit Error Threshold. | |
42 | ||
43 | 4. Make sure used memory region got re-initialized with 0xcafecafe pattern | |
44 | ||
45 | => md 200000 | |
46 | 00200000: cafecafe cafecafe cafecafe cafecafe ................ | |
47 | 00200010: cafecafe cafecafe cafecafe cafecafe ................ | |
48 | 00200020: cafecafe cafecafe cafecafe cafecafe ................ | |
49 | 00200030: cafecafe cafecafe cafecafe cafecafe ................ | |
50 | 00200040: cafecafe cafecafe cafecafe cafecafe ................ | |
51 | 00200050: cafecafe cafecafe cafecafe cafecafe ................ | |
52 | 00200060: cafecafe cafecafe cafecafe cafecafe ................ | |
53 | 00200070: cafecafe cafecafe cafecafe cafecafe ................ | |
54 | 00200080: deadbeef deadbeef deadbeef deadbeef ................ | |
55 | 00200090: deadbeef deadbeef deadbeef deadbeef ................ | |
56 | ||
57 | ||
58 | Injecting Multiple-Bit Errors | |
59 | ----------------------------- | |
60 | ||
61 | 1. Set more than 1 bit in Data Path Error Inject Mask | |
62 | ||
63 | => ecc injectdatahi 5 | |
64 | ||
65 | 2. Run test over some memory region | |
66 | ||
67 | => ecc test 200000 10 | |
68 | ||
69 | 3. Check ECC status | |
70 | ||
71 | => ecc status | |
72 | ... | |
73 | Memory Data Path Error Injection Mask High/Low: 00000005 00000000 | |
74 | ... | |
75 | Memory Error Detect: | |
76 | Multiple Memory Errors: 1 | |
77 | Multiple-Bit Error: 1 | |
78 | Single-Bit Error: 0 | |
79 | ... | |
80 | ||
81 | Observe that both Multiple Memory Errors and Multiple-Bit Error flags are set. | |
82 | ||
83 | 4. Make sure used memory region got re-initialized with 0xcafecafe pattern | |
84 | ||
85 | => md 200000 | |
86 | 00200000: cafecafe cafecafe cafecafe cafecafe ................ | |
87 | 00200010: cafecafe cafecafe cafecafe cafecafe ................ | |
88 | 00200020: cafecafe cafecafe cafecafe cafecafe ................ | |
89 | 00200030: cafecafe cafecafe cafecafe cafecafe ................ | |
90 | 00200040: cafecafe cafecafe cafecafe cafecafe ................ | |
91 | 00200050: cafecafe cafecafe cafecafe cafecafe ................ | |
92 | 00200060: cafecafe cafecafe cafecafe cafecafe ................ | |
93 | 00200070: cafecafe cafecafe cafecafe cafecafe ................ | |
94 | 00200080: deadbeef deadbeef deadbeef deadbeef ................ | |
95 | 00200090: deadbeef deadbeef deadbeef deadbeef ................ | |
96 | ||
97 | ||
98 | Test Single-Bit Error Counter and Threshold | |
99 | ------------------------------------------- | |
100 | ||
101 | 1. Set 1 bit in Data Path Error Inject Mask | |
102 | ||
103 | => ecc injectdatahi 1 | |
104 | ||
105 | 2. Enable error injection | |
106 | ||
107 | => ecc inject en | |
108 | ||
109 | 3. Let u-boot run for a with Single-Bit error injection enabled | |
110 | ||
111 | 4. Disable error injection | |
112 | ||
113 | => ecc inject dis | |
114 | ||
115 | 4. Check status | |
116 | ||
117 | => ecc status | |
118 | ||
119 | ... | |
120 | Memory Single-Bit Error Management (0..255): | |
121 | Single-Bit Error Threshold: 255 | |
122 | Single Bit Error Counter: 60 | |
123 | ||
124 | Memory Error Detect: | |
125 | Multiple Memory Errors: 1 | |
126 | Multiple-Bit Error: 0 | |
127 | Single-Bit Error: 1 | |
128 | ... | |
129 | ||
130 | Observe that Single-Bit Error is 'on' which means that Single-Bit Error Counter | |
131 | reached Single-Bit Error Threshold. Multiple Memory Errors bit is also 'on', that | |
132 | is Counter reached Threshold more than one time (it wraps back after reaching | |
133 | Threshold). | |
134 | ||
135 |