Thank you very much for your clues as I'm stuck on this for almost a week.
[snip]
Is this DIMM memory sticks with using SPD configuration or are the SDRAM chips soldered to the board?
They are soldered.
Did you verify the SDRAM databook timing vs. what you configured your SDRAM controller to do? Did the hardware engineer that made the board verify your configuration? Did he give you a good configuration? If so, are you sure it is good??? (never trust the hardware weenies ;-)
Did you read and understand http://www.denx.de/wiki/view/DULG/SDRAM ?
My SDRAM is a Micron MT48LC16M16A2. My init sequence is exactly the same as the one in "freescale/mpc8266ads/mpc8266ads.c" or "sacsng/sacsng.c" that use MT48LC8M16A2 , but I checked it anyway.
My PSDMR values have been given by another product using exactly the same board and same HWCR configuration (PLD). But I will check them again.
I think I may configure incorrectly some other register that disturbs the timing. I thought about ECC as they are used, and tried a configuration with it disabled, same result. I also disabled all caches (HID0) for precaution.
In real estate the three most important things are "location, location, location." In engineering, they are "timing, timing, timing."
I'm learning it the hard way (perhaps the only way...).
HTH, gvb
Thanks, Rémi