136 lines
3.6 KiB
Plaintext
136 lines
3.6 KiB
Plaintext
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Use cases for DDR 'ecc' command:
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================================
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Before executing particular tests reset target board or clear status registers:
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=> ecc captureclear
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=> ecc errdetectclr all
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=> ecc sbecnt 0
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Injecting Single-Bit Errors
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---------------------------
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1. Set 1 bit in Data Path Error Inject Mask
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=> ecc injectdatahi 1
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2. Run test over some memory region
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=> ecc test 200000 10
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3. Check ECC status
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=> ecc status
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...
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Memory Data Path Error Injection Mask High/Low: 00000001 00000000
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...
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Memory Single-Bit Error Management (0..255):
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Single-Bit Error Threshold: 255
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Single Bit Error Counter: 16
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...
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Memory Error Detect:
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Multiple Memory Errors: 0
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Multiple-Bit Error: 0
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Single-Bit Error: 0
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...
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16 errors were generated, Single-Bit Error flag was not set as Single Bit Error
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Counter did not reach Single-Bit Error Threshold.
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4. Make sure used memory region got re-initialized with 0xcafecafe pattern
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=> md 200000
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00200000: cafecafe cafecafe cafecafe cafecafe ................
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00200010: cafecafe cafecafe cafecafe cafecafe ................
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00200020: cafecafe cafecafe cafecafe cafecafe ................
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00200030: cafecafe cafecafe cafecafe cafecafe ................
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00200040: cafecafe cafecafe cafecafe cafecafe ................
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00200050: cafecafe cafecafe cafecafe cafecafe ................
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00200060: cafecafe cafecafe cafecafe cafecafe ................
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00200070: cafecafe cafecafe cafecafe cafecafe ................
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00200080: deadbeef deadbeef deadbeef deadbeef ................
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00200090: deadbeef deadbeef deadbeef deadbeef ................
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Injecting Multiple-Bit Errors
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-----------------------------
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1. Set more than 1 bit in Data Path Error Inject Mask
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=> ecc injectdatahi 5
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2. Run test over some memory region
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=> ecc test 200000 10
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3. Check ECC status
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=> ecc status
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...
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Memory Data Path Error Injection Mask High/Low: 00000005 00000000
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Memory Error Detect:
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Multiple Memory Errors: 1
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Multiple-Bit Error: 1
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Single-Bit Error: 0
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...
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Observe that both Multiple Memory Errors and Multiple-Bit Error flags are set.
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4. Make sure used memory region got re-initialized with 0xcafecafe pattern
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=> md 200000
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00200000: cafecafe cafecafe cafecafe cafecafe ................
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00200010: cafecafe cafecafe cafecafe cafecafe ................
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00200020: cafecafe cafecafe cafecafe cafecafe ................
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00200030: cafecafe cafecafe cafecafe cafecafe ................
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00200040: cafecafe cafecafe cafecafe cafecafe ................
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00200050: cafecafe cafecafe cafecafe cafecafe ................
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00200060: cafecafe cafecafe cafecafe cafecafe ................
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00200070: cafecafe cafecafe cafecafe cafecafe ................
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00200080: deadbeef deadbeef deadbeef deadbeef ................
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00200090: deadbeef deadbeef deadbeef deadbeef ................
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Test Single-Bit Error Counter and Threshold
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-------------------------------------------
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1. Set 1 bit in Data Path Error Inject Mask
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=> ecc injectdatahi 1
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2. Enable error injection
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=> ecc inject en
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3. Let u-boot run for a with Single-Bit error injection enabled
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4. Disable error injection
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=> ecc inject dis
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4. Check status
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=> ecc status
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...
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Memory Single-Bit Error Management (0..255):
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Single-Bit Error Threshold: 255
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Single Bit Error Counter: 60
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Memory Error Detect:
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Multiple Memory Errors: 1
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Multiple-Bit Error: 0
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Single-Bit Error: 1
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...
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Observe that Single-Bit Error is 'on' which means that Single-Bit Error Counter
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reached Single-Bit Error Threshold. Multiple Memory Errors bit is also 'on', that
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is Counter reached Threshold more than one time (it wraps back after reaching
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Threshold).
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