On Monday 04 May 2009, Jonathan Haws wrote: > > From my experience you can't be sure that SDRAM setting are "currect" at > > this > > stage. > > Would that be the case on our other 6 boards then? We have 6 boards that > are up and running with the exact same U-Boot binary file. If there was a > problem with the SDRAM settings on one board, would not the other board > show the same symptoms?
Not necessarily. Some SDRAM related problems only show very seldom or only under specific conditions (temperature and/or component differences etc). This "might" explain why some boards show no problems and other do. > That is the reason why I have not dug deeper into > the SDRAM initialization. However, I will take your advice and do so, > because if there is a problem there, then the other boards may be > experiencing problems, just not to the extent that this one is. > > > > and that I am using the right addresses and chip > > > selects for the data cache. > > > > > > Currently I am leaning toward an SDRAM problem because I get about a 20 > > > second pause when U-Boot tries to relocate to RAM. > > > > Yes, I'm pretty sure that you have some SDRAM related problems. Either > > configuration is non-optimal, or even (perhaps more unlikely) a hardware > > problem. I suggest that you re-check the DDR2 autocalibration (method A & > > B). > > Thanks for confirming my initial hunch - problem lies in SDRAM. I will let > you know what I find - whether it is a hardware or software problem. > > One thing I may mention is that we had the SDRAM chips re-balled before > they were mounted on the board. Maybe something went wrong during that > process on these chips on the problem board - who knows. I see. This could be a problem. I suggest that you run some stress tests in a conditioning cabinet to see if the other boards don't show any problems. Best regards, Stefan ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: off...@denx.de ===================================================================== _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
