[U-Boot-Users] mtest issue on MPC8272

[U-Boot-Users] mtest issue on MPC8272

[raymond yang]

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?

thanks!

Best Regards
Raymond


=> mtest
Pattern 00000000  Writing...  Reading...
Mem error @ 0x00110000: found 00044000, expected
00004000

Mem error @ 0x00118000: found 40246000, expected
00006000

Mem error @ 0x001A0000: found 00268000, expected
00028000

Mem error @ 0x001B0000: found 0006C000, expected
0002C000

Mem error @ 0x001F8000: found 0427E000, expected
0003E000

Mem error @ 0x00200000: found CC320000, expected
00040000

Mem error @ 0x00208000: found C4322000, expected
00042000


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[U-Boot-Users] mtest issue on MPC8272

[Wolfgang Denk]

In message <20050622034649.25352.qmail@web31505.mail.mud.yahoo.com> you wrote:
> 
> Does this mean we failed to configure the SDRAM or due
> to hardwarer issue?

It looks like a serious hardware  problem  to  me.  But  then  I'm  a
software guy, and I always try to blame hardware first :-)

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Unix: Some say the learning curve is steep,  but  you  only  have  to
climb it once.                                      - Karl Lehenbauer

[U-Boot-Users] 回复： [U-Boot-Users] mtest issue on MPC8272

[Sam Song]

-- raymond yang <raymond_yang95134@yahoo.com> wrote:
> Does this mean we failed to configure the SDRAM or
> due to hardwarer issue?

Could your board work with BDI? If not, problem
should be with SDRAM configuration, I am afraid.

Best regards,

Sam


		
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[U-Boot-Users] 回复： [U-Boot-Users] mtest issue on MPC8272

[Wolfgang Denk]

In message <20050622085534.18544.qmail@web15910.mail.cnb.yahoo.com> you wrote:
>
> Could your board work with BDI? If not, problem
> should be with SDRAM configuration, I am afraid.

I disagree. It looks as if only the high order bits are affected (one
of the chips). This is most probably a hardware issue.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
I will not say that women have no character;  rather, they have a new
one every day.                                               -- Heine

[U-Boot-Users] mtest issue on MPC8272

[Sam Song]

Wolfgang Denk <wd@denx.de> wrote:
> > Could your board work with BDI? If not, problem
> > should be with SDRAM configuration, I am afraid.

A typo. I meant to write "Could your board work
WITHOUT BDI?".

> I disagree. It looks as if only the high order bits
> are affected (one of the chips). This is most 
> probably a hardware issue.

I agree your point as well, expecially target cannot
boot without BDI.

Thanks for this correction,

Sam

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[U-Boot-Users] mtest issue on MPC8272

[Jerry Van Baren]

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?
> 
> thanks!
> 
> Best Regards
> Raymond
> 
> 
> => mtest
> Pattern 00000000  Writing...  Reading...
> Mem error @ 0x00110000: found 00044000, expected
> 00004000
> 
> Mem error @ 0x00118000: found 40246000, expected
> 00006000
> 
> Mem error @ 0x001A0000: found 00268000, expected
> 00028000
> 
> Mem error @ 0x001B0000: found 0006C000, expected
> 0002C000
> 
> Mem error @ 0x001F8000: found 0427E000, expected
> 0003E000
> 
> Mem error @ 0x00200000: found CC320000, expected
> 00040000
> 
> Mem error @ 0x00208000: found C4322000, expected
> 00042000

Hi Raymond,

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.

Questions:
* What is your memory configuration (x8, x16, x32)?  What is the SDRAM 
page size?
* 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...
gvb