Just a "me too" reply, echoing Ralf's comment. On my board, the Beaglebone is a "guest". The host board runs off +24 V, and provides two SMPS (5V and 3V3) to subsystems. The host 5V is hooked up to the BBB barrel jack pins on P9. The BBB's 3V3 supply is left unconnected, and the host board supplies 3V3 to various systems.
Without sequencing the host 3V3 to SYS_RESETn, I was getting approximately 80% failure rate for the PHY, even with bone-debian-8.4-lxqt-4gb-armhf-2016-05-13-4gb.img. (This was manually recorded with ~20 attempts.) When I keyed the 3V3 SMPS off SYS_RESETn, the PHY behaved much better, 10/10 times. Hoping this can help someone else! - Tim On Sunday, April 3, 2016 at 7:59:49 PM UTC-4, [email protected] wrote: > > Hi all, > > The problem seems to be influenced by the outside power supply. > > I run Debian Jessie with kernel 4.1.15-ti-rt-r43 on an 1month old > element14 BBB (where do I find the revision??) and have the same issues. > The BBB is getting its power from a custom carrier board which has a DC-DC > on. Doing a cold start by plugging the battery in, the Ethernet is hit and > miss (more miss than hit). > Pressing the reset button got it working every time so far. > > The DC-DC isn't running perfect yet, as it only got the theoretical values > in and is not optimized yet. > > Regards > > Ralf > > -- 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/97ab9594-8b51-4f53-9713-17221293877d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
