I have been unable to get a PocketBeagle to run for more than about 12 hours without rebooting when powered from Vin (P1-pin1), using a trusted power supply. It usually reboots itself successfully, so in order to see it, run some commands to turn off the blinking blue lights. If they come back on by themselves, it has rebooted. Or you can read the system logs.
It works fine when powered from Vi (P1-pin7) which is the same as the Vusb +5 Volt input/output. It works fine when Vi and Vin are paralleled, but I am uncomfortable paralleling power supplies, unless someone who really understands them says it is OK. The docs indicate that Vin (P1-pin1) should be the primary power input for power inputs other than battery or USB, and this input should have the highest current handling capability of the three. So far, I find that Vin is approximately worthless. Your mileage may vary. So far, no reaction or comment from Jason or Robert. If you can, or can not, duplicate my observations, please comment. As far as a replacement for SYS_RESETn, I don't think that the external 3V3 power appears until the system has booted, so you could use this Voltage to gate things that might upset the boot process, or break things prior to the CPU booting. At least that is how it worked on the BBB, so I assume the same on the PocketBone. --- Graham == On Friday, December 8, 2017 at 3:16:45 AM UTC-6, [email protected] wrote: > > Nobody an idea? While searching through the board here I find two > different opinions about VDD/where to apply external power to, so some > clarification would be really nice... > > > > On Saturday, December 2, 2017 at 6:22:47 PM UTC+1, [email protected] > wrote: >> >> Can somebody verify where the following pins/signals can be found at the >> PocketBeagle (comparing to BeagleBone Black): >> >> - VDD (to supply externel power apart from USB) >> - SYS_RESETn (signalling SiP is in reset state and no inputs are allowed >> to be pulled to LOW or HIGH) >> >> ? >> >> Thanks! >> >> >> -- 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/745ad78f-2b4c-468f-baf0-aca487c7d8d7%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
