Mini2440 U-Boot mtest hangs

Hi,

I'm new here.
I've installed U-Boot on my brand new Mini2440(1GB).
So far so good :-)

Now I've tried mtest (output is included).
Writing zeroes throws some errors.
Writing FFs hangs then.

Is there a defect on my dram?
Or is there any problem with U-Boot mtest?

Any advise?

Kind Regards

Dirk


U-Boot 1.3.2-mini2440 (Jan 12 2011 - 17:16:16)

I2C:   ready
DRAM:  64 MB
NOR Flash not found. Use hardware switch and 'flinit'
Flash:  0 kB
NAND:  1024 MiB
Found Environment offset in OOB..
USB:   S3C2410 USB Deviced
In:    serial
Out:   serial
Err:   serial
MAC: 08:08:11:18:12:27
Hit any key to stop autoboot:  0 
MINI2440 # mtest
Pattern 00000000  Writing...  Reading...
Mem error @ 0x33D5FB2C: found 00000001, expected 00F57ECB

Mem error @ 0x33D5FB30: found 33D5FB2C, expected 00F57ECC

Mem error @ 0x33D5FB34: found 33D5FB2C, expected 00F57ECD

Mem error @ 0x33D5FB38: found 00F57ECD, expected 00F57ECE
Pattern FFFFFFFF  Writing...

Only based on u-boot and 64M experience.  There are 4 blocks that show up
bad on my machine, but believe this is normal as they are reserved for
something (BBT?)

Never ran <mtest>, always use <nand scrub> and <nand createbbt>

HTH
Dave

the commands <nand scrub> and <nand createbbt>
are working fine on my board.
But aren't those for the NAND-Flash and not for RAM?

Does U-Boot check the ram, where itself is located?

Now I've tried:
mtest 0x30000000 0x33D5FB00

That seems to work.
Is it right, that the last MB of RAM is reserved for Frame Buffer?

May it be a problem, writing something in the FB without initialising?

Yes, they are.  Sorry, I mis-understood what you were trying to do.