[U-Boot-Users] mtest issue on MPC8272
Jerry Van Baren
gerald.vanbaren at smiths-aerospace.com
Wed Jun 22 14:10:25 CEST 2005
raymond yang wrote:
> Hi All,
> My board got problems while running m_test, any idea,
> Looks like the high order two bytes mismatched, while
> low part correct.
> Does this mean we failed to configure the SDRAM or due
> to hardwarer issue?
> Best Regards
> => mtest
> Pattern 00000000 Writing... Reading...
> Mem error @ 0x00110000: found 00044000, expected
> Mem error @ 0x00118000: found 40246000, expected
> Mem error @ 0x001A0000: found 00268000, expected
> Mem error @ 0x001B0000: found 0006C000, expected
> Mem error @ 0x001F8000: found 0427E000, expected
> Mem error @ 0x00200000: found CC320000, expected
> Mem error @ 0x00208000: found C4322000, expected
Suspicious: only one error per instance, and that on a 4KB boundary.
Sounds like Something Bad[tm] is happening on a page boundary (e.g. page
close, new page open). For the common hardware faults of shorted
address and/or data lines, you would get a whole burst of errors when
the affected lines are exercised.
* What is your memory configuration (x8, x16, x32)? What is the SDRAM
* Are these the only errors found?
* Can you use the command line to write to the error addresses and read
back the proper values? If not, what do you get? Use various patterns,
are the upper two bytes random or related to the lower two bytes?
Inquiring minds want to know...
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