UP1100 problem

[dave@ada2.unipv.it]

Hi all,
	recently my UP1100 is continuing to prompt me this type of error
messages (they are written to console and logged also by syslog with 
kernel facility type):

> NAUTILUS Machine check 0x630 [Correctable Processor Machine Check]
PALcode logout frame:  MCHK_Code       134  MCHK_Frame_Rev  1
I_STAT  0000000000000000  DC_STAT 0000000000000008  C_ADDR
000000000763e100
SYND1   000000000000002c  SYND0   000000000000002c  C_STAT
0000000000000003
C_STS   0000000000000008  RES     0000000000000000
EXC_ADDRffff800000006040
IER_CM  ffff800000006040  ISUM    ffff800000006040  MM_STAT
ffff800000006040
PALBASE ffff800000006040  I_CTL   00000000000000c8  PCTX
000000a000000018
CPU registers: PC      fffffc000033e360  Return  fffffc000033e170
interpretation:  (to Dcache): DC_STAT[ECC_ERR_LD]
C_STAT[DSTREAM_MEM_ERR]
 Memory single-bit error on Dcache fill, Address 0x763E100, bit 13

I can't understand them clearly... they appear quite randomly excuting
commands: it'a perhaps a memory problem?  Thanks in advance for any hint.

Regards,
	Davide

P.S.
By the way, I'm using debian woody with linux 2.2.20