Perhaps. But how it is connected with the recording in the flash memory. eMMC powered from different supply VDD_3V3B. According to documentation it takes about 50mA in write mode. So why VDD_1V8 drops down ? Bad 5V power from USB ? I will examine this issue. But in all other cases BBB works well. I have to find a workarownd. Externally it looks like some exception or power fail after some time of extensive write to eMMC. I should kill some more BBB to find an answer
вторник, 11 октября 2016 г., 22:13:22 UTC+3 пользователь john3909 написал: > > If the BBB oscillator is not running, then I suspect the processor is bad. > If you have two boards with the same issue, then I suspect the power supply > you are using is bad. One of the big issues with the BBB is it doesn’t like > to power down. Look at sheet 2 of the OSD335x schematics > > > http://octavosystems.com/octavosystems.com/wp-content/uploads/2016/05/OSD3358-SBC-Referece-Design.pdf > > You will see some protection circuitry at the bottom center of the sheet. > This ensures the voltage difference between the 3v3 and 1v8 is never > greater than 2V. The BBB does not have any such circuitry so when the 5V > drops quickly, it is possible for the 1v8 to drop quicker than the 3v3 and > hence killing the processor. This happened to me and I had to replace the > processor. > > The Beagleboard-x15 does have the same protection circuitry > (BeagleBoard-X15_RevA2.pdf sheet 4). > > Regards, > John > > > > > On Oct 11, 2016, at 7:05 AM, Николай Курочкин <[email protected] > <javascript:>> wrote: > > Two BeagleBone black boards with 1GHZ processors do not make boot sequece > after some unsucceseful attemts to format eMMC. > It looks like they do not make PORz sequence. Both ocillators inacvtive. > NRESET_INOUT is low. PORZn input high. All power voltages are OK. > I use simple code wich make BBB to act as USB flash drive to monitor eMMC > with my PC. Code based on TI usb_dev_msc example in StarterWare. > It begin happens only with new boards. Old revision boards works OK. > Any body can help ? > I going to use JTAG to debug this processors but not shure that JTAG will > work in this case. > > -- > 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] <javascript:>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/09fb54d2-3afa-4191-b10b-856ad52ae245%40googlegroups.com > > <https://groups.google.com/d/msgid/beagleboard/09fb54d2-3afa-4191-b10b-856ad52ae245%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/ce78c227-2ecb-44e4-b823-522ba0ebff65%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
