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U-boot produces no serial output on p5020 system

Question asked by Mark Purcell on Jul 15, 2013
Latest reply on Jul 15, 2013 by lunminliang

I have a strange problem in that an SD card with U-boot will boot fine in a dev system but not in our system. The systems are very similar, only main differences are we are using rev 2 silicon and the dev system has rev 1 silicon, the power supplies, and SERDES configuration.


In our system HRESET_n goes back high after about 750ms, followed by ASLEEP going low 750ms later.


What conditions have to be OK for ASLEEP to eventually go low? Could U-boot be loaded for example, and the core is hung?

Also is there any difference in binary code for rev 2 silicon compared to rev 1 silicon (do apps need to be re-compiled for example)?


Thanks in advance for your help.