files damaged on memory disk on Marvell Discovery 78100

[Matthias Reyelt]

Hi,

I have observed a strange behaviour on the Marvell Discovery:

I have a memory disk for /etc and /opt:
/dev/md0 on /etc (ufs, local)
/dev/md1 on /opt (ufs, local)

When I copy files to that disk, which are larger than 0x1ffff (131071 bytes), 
these files differ from the original. This occurs only when copying to md. 

Kernel is:
FreeBSD discovery1 8.0-STABLE FreeBSD 8.0-STABLE #0 r206836: Mon Apr 19 
12:53:42 CEST 2010    
root at vbcspc12.bcs.brunel.local:/usr/obj/arm/root/ARM/8/sys/DB-78XXX  arm

I had a look into the damaged file and found some excerpts from files located 
in /etc (which is also in RAM):
------------------------------------------------------------
passwd: compat
passwd_compat: nis
shells: files
-----------------------------------------------------------------
...
-----------------------------------------------------------------
staff:*:20:
sshd:*:22:
smmsp:*:25:
mailnull:*:26:
guest:*:3-���
------------------------------------------------------------------

Looks as if the CPU has problems accessing the RAM. I have already changed the 
RAM, so I don't think it's a hardware problem. 

Any idea?

Matthias