Yes based on your design that is what will happen. You cannot tie anything to the BOOT pins until after reset.
Read the System Reference Manual for more information. http://www.elinux.org/Beagleboard:BeagleBoneBlack#Hardware_Files Gerald On Fri, Apr 3, 2015 at 3:32 AM, <[email protected]> wrote: > Hi, > > I have this problem with my bbb: > > I have two DACs made of ressistor ladder connected to pins P8 39-46 > (PRU1_0 - PRU1_7). > When I try to power on my bbb and the DACs are connected then bbb doesn't > boot. Only > power led is on (next to the DC barel). Serial output also doesn't print > anything at all. > Just to elaborate a bit the Dacs are not actually connected to any output > during boot, so just the pins > are connected via resistors (4K, 2K, 1K, 500ohm). > > The schmeatics looks like this: > o----[4k]---------+---------> out ---> 75 Ohm --->GND > o----[2k]---------| > o----[1k]---------| > o----[500]--------+ > > > When I unplug the DACs my bbb boots normally. Serial output prints kernel > messages etc. so everything is fine. > > Is this expected? If not, what can be the issue ? If yes, do I have to > use some sort of switch on/ off > mechanism that will disable my DAC during power on to let bbb to boot ? > > Cheers! > ole > > -- > 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]. > For more options, visit https://groups.google.com/d/optout. > -- Gerald [email protected] http://beagleboard.org/ http://circuitco.com/support/ -- 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]. For more options, visit https://groups.google.com/d/optout.
