Anything connected to a BBB must not be powered up until the BBB is powered up so what you have done is correct
On 6/14/2016 10:06 AM, [email protected] wrote: > 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] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/97ab9594-8b51-4f53-9713-17221293877d%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/97ab9594-8b51-4f53-9713-17221293877d%40googlegroups.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout. -- 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/5d860854-b839-cb8b-665d-25310c664643%40gmail.com. For more options, visit https://groups.google.com/d/optout.
