**** BEGIN LOGGING AT Sat Apr 25 02:59:59 2015 Apr 25 12:21:21 ACTION  Apr 25 12:46:58 Hello Guys :) i have a huge problem with my BBB. it fell off to the floor last evening, it was in his case, it fell 1 meter to the ground and now it doesnt boot up. just the power led is on, the other ones are off, and i dont see it on my network list either. pls help me out, guys. Zsolt Apr 25 12:47:13 <_av500_> maybe its broken Apr 25 12:47:29 it can break so easily? Apr 25 12:48:20 <_av500_> I dont think it was drop tested Apr 25 12:49:07 oh god, that is badbadnotgood.... Apr 25 12:49:26 <_av500_> well, its hard to say from looking at a line in IRC Apr 25 12:49:43 <_av500_> and my crystal ball is broken too, fell off a table Apr 25 12:52:05 ok, got it, i just asked, if i could do anything about it, without buying a new one... sorry fo asking Apr 25 12:52:24 <_av500_> well, inspect it Apr 25 12:52:34 <_av500_> there is not much you can do Apr 25 12:52:49 <_av500_> if it booted before and now does not Apr 25 12:52:58 <_av500_> you could try to boot from SD card Apr 25 12:53:30 <_av500_> if one of the lines to the emmc has gone bad Apr 25 12:54:08 ok, i will try it :) Apr 25 13:14:33 Good morning and afternoon Apr 25 14:55:45 hmmm someone asked about ham radio and BBB last night ... Apr 25 15:09:12 Is there a new image for Jessie's coming out today or should I just use the test from the 19th? Apr 25 15:22:13 What makes the ixqt image different from the normal jessie image? Apr 25 18:41:00 I'm trying to upgrade my BBB but some pkgs can not be upgraded. BeagleBoard.org BeagleBone Debian Image 2014-04-23 Apr 25 18:42:59 i comment out deb [arch=armhf] http://debian.beagleboard.org/packages wheezy-bbb main from sources.list but no luck Apr 25 23:25:08 heh, collegue took a picture of my BBB setup when I was doing tests of the pmic... http://gerbil.xs4all.nl/werk/bbb-pmic-testing.jpg Apr 25 23:25:19 it looks like it's on an Intensive Care unit or something Apr 25 23:29:52 not Intensive Care, Awesome Care Apr 25 23:33:14 heh Apr 25 23:34:18 I'm considering making a little page combining the scope pics I got with some explanation of what's happening (afaik / afaics) in the various power and power-transition states the pmic is involved in Apr 25 23:37:30 ah real debugging .. nice zmatt .. welcome to real electronics ;p Apr 25 23:38:42 not even really debugging as such, just trying to construct a mental model of what's going on in that thing to determine our options for powering that thing Apr 25 23:39:41 though bugs definitely are available :P e.g. I rediscovered the 3v3b-regulator issue (that someone reported ages ago but I forgot about that) Apr 25 23:40:44 and the strict power-up minimum slope is also an unpleasant surprise Apr 25 23:40:45 zmatt : do you have a power consumption log while powering up? Apr 25 23:41:03 I put a time-delay FET before the board Apr 25 23:41:39 I'm not saying it's a problem, just an unpleasant surprise :P and one I really don't understand Apr 25 23:41:58 TI makes some high-end parts Apr 25 23:42:14 especially since it'll also be in some kind of undervoltage state after power loss, but that doesn't prevent powering up Apr 25 23:43:09 (I noticed from my scope pics that even if the supply has dropped to 1V apparently some pmic internal logic is still functional, since power-up at that point shows a sequence which matches a "soft boot" (e.g. pretting the power button) rather than a cold boot Apr 25 23:43:14 hm isn't undervoltage state only when there is actually some voltage there? Apr 25 23:43:14 ) Apr 25 23:43:20 ah yes Apr 25 23:43:30 that fits with my recollection of the data sheet Apr 25 23:43:53 1V != "power loss" :) Apr 25 23:44:18 well UVLO is used for more than one purpose, though I wasn't referring specifically to that, just the general case of having low voltage on the input Apr 25 23:45:08 I mean, the PMIC is fine with it after the first power-up, and will correctly detect a valid voltage level when it rises again... why isn't the same true for initial power up? that part just puzzles me Apr 25 23:46:02 maybe they ran out of time Apr 25 23:46:16 CareBear\: my scope pics are here btw, if you're interested -> http://gerbil.xs4all.nl/bbb-pmic/ Apr 25 23:46:27 though the description of each pic (in info.txt) is currently a bit... terse Apr 25 23:46:54 hm Apr 25 23:47:24 I will do boot measurements once the new meter arrives Apr 25 23:47:25 batmon connected to bat (as datasheet shows) versus batmon and bat individually floating also causes noticable differences, although mainly in the voltage measured on BAT Apr 25 23:47:42 I have some current readings, but i didn't spend any real attention to it Apr 25 23:48:25 just curious how much difference in power it makes to supply the BBB from 3.5V, 4V, 4.5V, 5V (through BAT pins) Apr 25 23:48:43 I could measure that too Apr 25 23:48:50 this was just u-boot btw, no system installed Apr 25 23:49:01 I see Apr 25 23:49:10 for the curious: Apr 25 23:49:31 3.500 V * 0.300 A = 1.050 W Apr 25 23:49:31 4.000 V * 0.277 A = 1.108 W Apr 25 23:49:31 4.500 V * 0.260 A = 1.170 W Apr 25 23:49:31 5.000 V * 0.246 A = 1.230 W Apr 25 23:50:16 but if you start drawing serious current from 3.3V (or even 1.8V) rails, the difference would get bigger obviously Apr 25 23:56:06 does anyone know they they moved VDDS from LDO3 (VDD_1V8) to LDO1 (VRTC) ? especially since this obliterates any hope of using RTC-only-mode Apr 25 23:56:22 in rev A6A Apr 26 01:22:48 What were their reasons? It might make more sense not to use an internal if you are going to make things more complicated in the end. I know they were trying to keep the budget and real estate low. Apr 26 02:19:36 Hi all, I cut red wire in my USB cable to avoid power BBB via USB. No connection with PuTTY after this. Why? Apr 26 02:27:10 was the usb cable for the console? Apr 26 02:27:48 I would imagine the bb has no means of knowing there's a usb attached any more. Apr 26 02:28:11 GenTooMan .. I'm guessing client/otg port. Apr 26 02:29:19 hmmm well you probably should use a correct PSU and the console cable if you plan on doing isolation. the 5V rail is used as part of the USB spec. Apr 26 02:30:10 Sadly I am barly sitting up right now so rational thinking is awake peoples department hopefully I'm not halucinating when I sleep :D Apr 26 02:41:47 hello? Apr 26 02:42:50 byeeeeee :P Apr 26 02:53:13 2 GenTooMan: BBB has powered from external source. USB used to communicate to PC. Apr 26 02:58:42 2 GenTooMan: PSU is OK. Not sure about console cable requirements? Serial communication with Teensy via USB just fine with cutted power rail. Expected the same from BBB. **** ENDING LOGGING AT Sun Apr 26 02:59:59 2015