On Fri, 09 Sep 2005 14:37:21 +0200, Clemens Koller writes:
I can't really rule out some problem in the Linux virtual memory system
Oh, I wouldn't blame the kernel in that case. 2.6.8 to 2.6.13 work really fine over here. What linux do you use?
We are using 2.6.13, with some patches from the ozlabs patch tracker.
If you would have the chance to have an ECCable system you can pretty easily check the reliability of the DDR looking at the ECC status registers.
Unfortunately, this would require a board re-design.
There is a story around here (from a guy who did a DDR for MPC8540) that you might have to put on really good capacitors on some of the ddr vref voltages on the CPU side because something is bouncing there more than you would expect...
Thanks - we will take a look at them ...
You also might want to check what happens if you increase/decrease supply voltages here and there... well... you know, all these EE tricks.
Your response is very much appreciated. Cheers! Murray...