Hi, My new BBB is arriving today and I'm concerned that it will be destroyed too. Any ideas on how to prevent this?
Yoram On Friday, May 8, 2015 at 7:56:23 AM UTC+3, Yoram Rotbach wrote: > > Reading through the revision 5.6 reference manual section 8.1.1 (LCD > pins), it seems that configuring those pins out of order could create real > electrical problem. > > this is the relevant text: > If you are using these pins for other functions, there are a few things to > keep in mind: > On the HDMI Framer, these signals are all inputs so the framer will not > be driving > these pins. > The HDMI framer will add a load onto these pins. > There are small filter caps on these signals which could also change the > operation > of these pins if used for other functions. > When used for other functions, the HDMI framer cannot be used. > There is no way to power off the framer as this would result in the > framer being > powered through these input pins which would not a be a good idea. > These pins are also the SYSBOOT pins. DO NOT drive them before the > SYS_RESETN signal goes high. If you do, the board may not boot because you > would be changing the boot order of the processor. > In order to use these pins, the SW will need to reconfigure them to > whatever function you > need the pins to do. To keep power low, the HDMI framer should be put in a > low power > mode via the SW using the I2C0 interface. > > On Friday, May 8, 2015 at 7:41:59 AM UTC+3, Yoram Rotbach wrote: >> >> Power led flashes for a sub second then turns off. As far as I understand >> this means that the power controller has issues with initiating the boot >> process. >> No serial debug is active. I assume this is active once the CPU is awake. >> >> >> On Friday, May 8, 2015 at 12:16:37 AM UTC+3, RobertCNelson wrote: >>> >>> On Thu, May 7, 2015 at 4:13 PM, Yoram Rotbach <[email protected]> >>> wrote: >>> > Hi, >>> > >>> > I wanted to play with the latest Debian image on my A5C board. >>> > After booting using HDMI display, everything was OK. >>> > Then I've connected my 4D systems 70LCD , but nothing was shown. >>> > So I've searched the web and found that adding >>> > dtb=am335x-boneblack-4dcape-70t.dtb to /boot/uEnv.txt is supposed to >>> solve >>> > the problem. >>> > So I did and this was the last time I saw my BBB alive :( It displays >>> all >>> > the symptoms of a blown processor. >>> > >>> > So my question is, could changing the uEnv.txt file the way I did >>> damaged >>> > the board? Is it possible to shorten GPIO pins this way? >>> > >>> > I wouldn't want this to happen again to my next BBB >>> >>> With the lcd not connected, what shows up on your serial debug? >>> >>> Regards, >>> >>> -- >>> Robert Nelson >>> https://rcn-ee.com/ >>> >> -- 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.
