HI Andrew & John, Thank you for your reply. I guess that leaves me with no choice but to tweak the hardware & also update the kernel to the latest version by Robert. Hopefully that will fix the issue for ever. I will keep you posted on the status.
regards, Jerin On Wednesday, 5 November 2014 01:23:28 UTC+5:30, john3909 wrote: > > > From: Andrew Glen <andrewt...@gmail.com <javascript:>> > Reply-To: "beagl...@googlegroups.com <javascript:>" < > beagl...@googlegroups.com <javascript:>> > Date: Monday, November 3, 2014 at 11:36 PM > To: "beagl...@googlegroups.com <javascript:>" <beagl...@googlegroups.com > <javascript:>> > Subject: Re: [beagleboard] Re: Beaglebone Black Ethernet Phy Not Detected > on Boot. > > Yes, and reading the thread even more fully you'll find my report of > running thousands of automated test restarts with these parts removed, with > a 100% success rate. > > We use these boards a lot, running 24-7 in this configuration, and have > had zero hardware faults. With any luck we have nearly exhausted Murphy's > law with our software. > > Hi Andrew, > > I accept that you have done these tests, but removing test two capacitors > from the reset line means the device will come out of reset before the > power supply has stabilized and without a capacitor, the reset switch will > bounce several times. That is not a good idea. Perhaps you are just lucky > given your setup, but removing C24 and C30 is a bad idea. Making these > capacitors smaller may fix your problem but I suggest that you do have > something there to delay the reset line. > > Regards, > John > > Andrew. > On 4/11/2014 7:26 PM, "John Syn" <john...@gmail.com <javascript:>> wrote: > >> >> From: Andrew Glen <andrewt...@gmail.com <javascript:>> >> Reply-To: "beagl...@googlegroups.com <javascript:>" < >> beagl...@googlegroups.com <javascript:>> >> Date: Monday, November 3, 2014 at 9:42 PM >> To: "beagl...@googlegroups.com <javascript:>" <beagl...@googlegroups.com >> <javascript:>> >> Subject: Re: [beagleboard] Re: Beaglebone Black Ethernet Phy Not >> Detected on Boot. >> >> As far as I know, and as already documented in this thread, the only >> reliable fix is to remove C24 and C30. >> >> If you read the full thread, Gerald say that if you remove these >> capacitors, the board may not start at all. >> >> Regards, >> John >> >> On 4/11/2014 5:40 PM, "Jerin George" <george...@gmail.com <javascript:>> >> wrote: >> >>> Hi, >>> I am using a BBB Rev C with latest Angstrom image and i have seen this >>> issue with eth not getting detected at boot up. This came at the last >>> stages of my project delivery. How can this be corrected. Does moving to >>> the latest debian image solves this issue ? >>> >>> regards, >>> Jerin George >>> >>> On Saturday, 26 July 2014 04:31:42 UTC+5:30, cmid...@gmail.com wrote: >>>> >>>> >>>> They phymask comes from a hardware register read by the davinci_mdio >>>> driver, which gets passed to the linux phy libraries. The problem is that >>>> the cpsw driver gets the value from device tree, which is hardcoded to >>>> address 0. Usually the values are the same (address 0), but sometimes the >>>> phy gets registered to a different address, usually in my case address 2. >>>> You calculate the address using the phymask. If you changed the phymask >>>> than, you pointing back to address 0, so that wouldn't help you. >>>> >>>> I rebuilt the dtb file. >>>> >>>> On Thursday, July 24, 2014 4:10:18 PM UTC-4, Loren Amelang wrote: >>>>> >>>>> On Wednesday, July 23, 2014 3:54:00 PM UTC-7, cmid...@gmail.com wrote: >>>>>> >>>>>> The davinci mdio driver should report a phymask and that value is >>>>>> used to update the device tree. >>>>>> >>>>> >>>>> Back when I had this problem I tried hard to find out where the >>>>> phymask comes from, and never succeeded. At that time people who received >>>>> a >>>>> phymask of fffffffe booted successfully, those with fffffffb failed. Do >>>>> you >>>>> know where the mask is found and how to change it? >>>>> >>>>> I also remove the second phy slave from the device tree. >>>>>> >>>>> >>>>> That seems like a great idea, if only to stop all the useless messages >>>>> about it never being found. Can that be done in the uEnv.txt, like when >>>>> you >>>>> disable HDMI, or do you have to rebuild the device tree binary? Would >>>>> setting the phymask to ffffffff accomplish the same thing? >>>>> >>>>> Loren >>>>> >>>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to a topic in the >>> Google Groups "BeagleBoard" group. >>> To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/beagleboard/9mctrG26Mc8/unsubscribe. >>> To unsubscribe from this group and all its topics, send an email to >>> beagleboard...@googlegroups.com <javascript:>. >>> 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 beagleboard...@googlegroups.com <javascript:>. >> 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 a topic in the >> Google Groups "BeagleBoard" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/beagleboard/9mctrG26Mc8/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> beagleboard...@googlegroups.com <javascript:>. >> 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 beagleboard...@googlegroups.com <javascript:>. > 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
