mpc83xx: Correct the README for DDR ECC
Update the README for DDR ECC, change the name to README.mpc83xx.ddrecc. Signed-off-by: Dave Liu <daveliu@freescale.com> Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
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Dave Liu
Kim Phillips
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@ -15,10 +15,10 @@ IMPORTANT NOTICE: enabling injecting multiple-bit errors is potentially
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dangerous as such errors are NOT corrected by the controller. Therefore caution
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should be taken when enabling the injection of multiple-bit errors: it is only
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safe when used on a carefully selected memory area and used under control of
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the 'ecc test' command (see example 'Injecting Multiple-Bit Errors' below). In
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particular, when you simply set the multiple-bit errors in inject mask and
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enable injection, U-Boot is very likely to hang quickly as the errors will be
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injected when it accesses its code, data etc.
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the 'ecc testdw' 'ecc testword' command (see example 'Injecting Multiple-Bit
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Errors' below). In particular, when you simply set the multiple-bit errors in
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inject mask and enable injection, U-Boot is very likely to hang quickly as the
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errors will be injected when it accesses its code, data etc.
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Use cases for DDR 'ecc' command:
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@ -40,7 +40,7 @@ Injecting Single-Bit Errors
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2. Run test over some memory region
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=> ecc test 200000 10
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=> ecc testdw 200000 10
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3. Check ECC status
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@ -61,57 +61,57 @@ Memory Error Detect:
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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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4. Make sure used memory region got re-initialized with 0x0123456789abcdef
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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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00200000: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200010: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200020: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200030: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200040: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200050: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200060: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200070: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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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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=> ecc injectdatahi 1
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=> ecc injectdatalo 1
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2. Run test over some memory region
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=> ecc test 200000 10
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=> ecc testword 200000 1
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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 Data Path Error Injection Mask High/Low: 00000001 00000001
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...
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Memory Error Detect:
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Multiple Memory Errors: 1
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Multiple Memory Errors: 0
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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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The Multiple Memory Errors flags not set 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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4. Make sure used memory region got re-initialized with 0x0123456789abcdef
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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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00200000: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200010: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200020: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200030: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200040: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200050: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200060: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200070: 01234567 89abcdef 01234567 89abcdef .#Eg.....#Eg....
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00200080: deadbeef deadbeef deadbeef deadbeef ................
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00200090: deadbeef deadbeef deadbeef deadbeef ................
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@ -140,7 +140,7 @@ Test Single-Bit Error Counter and Threshold
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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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Single Bit Error Counter: 199
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Memory Error Detect:
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Multiple Memory Errors: 1
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