Hi, first of all: I have seen the thread that discusses the PHY-failure which normally happens very, very rarely.
Now my problem is: I have a relatively complex cape connected to my BeagleBone Black/Green. With this cape I see this PHY hardware initialisation failure quite often. It happens randomly but about once per four power-ups. I can bring back the PHY by pressing the reset-button, but in some (seldom) cases I have to reset the board up to 6 times. Resetting the AM3358 by software (by writing 0x00000002 to address 0x44E00F00) does not solve the problem. Here the SYS_RESETn should be pulled to LOW too, but it seems the time is not long enough for the PHY. This behaviour is reproducible caused by my own cape: I tested it with several BeagleBone Black and Green, they all show this behaviour when connected to my cape but work properly when nothing is connected or when some other capes are plugged. During design of the cape I followed strictly the rules listed at http://elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Pin_Usage . And the problem appears in both cases, when the board us USB-powered only and when an external power supply is connected. So my question: what could cause such a behaviour? What is the PHY sensisitve for? I know, my information regarding the cape are quite inaccurate (because I can't give many details easily here), but any idea and any rough guess is welcome! Paul -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/d3d8d726-5d72-44dc-820a-e62bdd4060af%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
