**** BEGIN LOGGING AT Sun Jun 19 02:59:58 2016 Jun 19 04:08:24 Hi all. I am not able to change the polarity of a PWM module. Presently by default it is set to normal, when I try to change it, I get a bash error as invalid arguement Jun 19 04:08:33 using kernel 4.1 Jun 19 04:08:51 however can change the period and duty_cycle to run the servo Jun 19 16:49:32 Is it possible to run BBB without proprietary software? Jun 19 16:49:46 yes Jun 19 16:50:10 one of the few setups nowadays Jun 19 16:50:41 great :-) Jun 19 16:51:29 of course some functionality is then unavailable. I think this is mainly the 3D GPU. Graphics ofc still works via framebuffer. Jun 19 16:52:01 I am not interested in displaying anything. Jun 19 16:52:18 All I want to display is possible via serial. Jun 19 20:48:22 Hello I have a rev A5a bbb that is not booting up.. The blue power light comes on when I use the barrel pin power but I get no heartbeat or anything else. Jun 19 20:49:51 I 've done a fair amount of googling an I think it's probably toast. (new one on order already) Jun 19 20:51:32 I notice the chip that's labeled u4 on the board seems to be getting real real warm.. Can't read the chip partnumber... Does this give anyone an aha of what's happening? Jun 19 21:01:13 u4 ? let's see... Jun 19 21:01:26 also, check if you get anything on the debug UART Jun 19 21:01:38 3v3b regulator Jun 19 21:02:21 I've had one bbb whose symptoms matched yours... maybe check if the eMMC also seems to heat up unduly Jun 19 21:02:35 jonasthomas: did you have anything plugged into the board before that happened? Jun 19 21:03:02 I had a cramps board (unpowered) plugged in Jun 19 21:04:37 it would also be useful to check the voltage on the 3v3b (pins 3&4 of P9) Jun 19 21:07:23 U4 getting hot would suggest something is shorting the 3v3b to ground, or at least drawing a lot of power from it; if 3v3b ends up significantly below 3.3v then the bbb can't boot from eMMC nor uSD Jun 19 21:09:11 I pulled the cramps off. No change of behavior with sd card or no sd card Jun 19 21:09:57 I need to change trains, bbl... Jun 19 21:11:46 There is no noticeable change in temp on the emmC.. Jun 19 21:24:54 tbr I don't have TTL-Uart with me at the moment. If I don't get communications with that would be an indicator that the main processor is fried... If I do get something to happen what that be an indicator that the PMIC ( TPS65217) is fried? Jun 19 21:25:47 if the SoC comes up somehow you should see "CCCCCCC" on the UART Jun 19 21:26:32 that would be the mask ROM boot loader looking for a UART payload Jun 19 21:27:29 I think USB could also show a very brief blip. don't remember, but might show up in the host pc log. Jun 19 21:28:35 I did see a brief blip when I plugged in with usb only (if that should matter) Jun 19 21:29:02 of the LED? check logs then. Jun 19 21:31:25 very momentary blip of the power led.. that's it.. Ummm.. which logs? Jun 19 21:32:33 if your host pc runs linux, check dmesg Jun 19 21:34:37 ubuntu 14.04 Jun 19 21:34:39 does this mean anything to you? Jun 19 21:34:40 [ 310.648854] usb 5-1: Product: AM335x USB Jun 19 21:34:42 [ 310.648861] usb 5-1: Manufacturer: Texas Instruments Jun 19 21:35:25 that looks like it comes up enough to say "hi" in ROMBL mode Jun 19 21:36:20 did your eMMC contain a valid OS? Jun 19 21:37:10 It's the original os with the board... I installed machinekit on the Usd Jun 19 21:40:43 So would debug Uart be the next logical step? Jun 19 21:47:22 I need to move on to other things... tbr and zmatt thank you for the advice. If you have any other thoughts, I'd love to hear them. Jun 19 22:11:15 jonasthomas: if power led only blips when connected via usb that again suggests something is drawing way too much power, causing the power to be cut (by host pc or by the pmic) Jun 19 22:11:35 appearing as usb device confirms the processor is still booting Jun 19 22:12:20 hey my cat spilled water on a beagle bone black, with no power or batteries attached to it -- is it going to be fine? I've got a fan on it and i'll leave it that way for a few days Jun 19 22:12:40 i presume it will be fine due to no power attached Jun 19 22:13:04 Zliba: well, oxidation could still be a problem of course Jun 19 22:13:25 alright Jun 19 22:13:30 wat do Jun 19 22:14:10 can't do anything about that, right? Jun 19 22:14:31 what components would be at risk of oxidization? Jun 19 22:16:20 most metals are, but I doubt it's a major concern... just be sure to leave it to dry long enough before attempting to power it on again since water draws into every narrow space where it can't evaporate quickly Jun 19 22:17:45 (and no I don't know how long, it will obviously also depends very much on the ambient temperature and humidity, and the amount of airflow) Jun 19 22:17:53 *depend Jun 19 22:37:48 @zmatt wasn't there something with rev A5A that the PMIC could get messed up with a low voltage condition? Would the behaviour be consistent with what I'm experiencing or would it be something different? Jun 19 22:55:38 your symptoms are consistent with something drawing way too much power from vdd_3v3b, e.g. a damaged IC or a stray fragment of copper wire, causing that supply rail to drop low enough to render eMMC and μSD inaccessible Jun 19 22:56:08 as well as the power cut (overcurrent fault) when powered via usb Jun 19 22:57:59 I'm not really sure which of the pmic and power supply issues you're trying to describe, but afaict it matches none of them Jun 19 23:17:21 zmatt, i was feeling around the board to see if anything else besides the voltage regulator heating. up.. nothing obvious... I'll inspect the board with a usb microscope when I get home... If its not a wire are there any components that I should keep an eye out for? Jun 19 23:30:04 well, most of the peripheral ICs are powered from the 3v3b actually, with exception of the HDMI framer. as I suggested earlier you can also confirm or refute the 3v3b hypothesis by simply measuring its voltage Jun 19 23:38:08 Ok don't have tools with me at the the moment, but try it later... Thanks Jun 20 01:46:30 so is the x-15 in stores yet? Jun 20 01:46:48 cause i'm looking at stores selling it byt i was under the impression it wasn't gonna be available outside of a small club Jun 20 01:48:14 still on pre-order I thought for at least another month... Jun 20 01:50:24 no updates since May in the wiki Jun 20 01:51:17 FCC retest was due Jun 20 01:51:35 but last update seems to indicate assembly has been put on hold Jun 20 01:55:13 ayjay: have you pre-registered? **** ENDING LOGGING AT Mon Jun 20 02:59:59 2016