That is the correct document. It is there, at least for now. Gerald
On Wed, Jan 4, 2017 at 5:19 PM, Justin Pearson <justin.pear...@gmail.com> wrote: > Thanks Gerald! Did I reference the correct version (CircuitCo's GitHub)? > > -Justin > > On Wed, Jan 4, 2017 at 3:15 PM, Gerald Coley <ger...@beagleboard.org> > wrote: > >> That brings tears to my eyes seeing someone quoting the manual. >> >> Yes, don't screw up the SYS_BOOT pins. >> >> Gerald >> >> >> On Wed, Jan 4, 2017 at 5:12 PM, Justin Pearson <justin.pear...@gmail.com> >> wrote: >> >>> Expanding Chad's comment, in the Beaglebone Black System Reference >>> Manual (Rev B, Jan 20, 2014) >>> >>> https://github.com/CircuitCo/BeagleBone-Black/blob/390c46a03 >>> e039661aeca6eab22e6c383d8d537f8/BBB_SRM.pdf >>> >>> "Figure 39. Processor Boot Configuration" in "Section 6.8 Default Boot >>> Options" says that the top two bits of the SYSBOOT register, >>> SYSBOOT[15:14], seem to select which oscillator is used (19.2MHz, 24MHz, >>> 25MHz, 26MHz). >>> >>> "Figure 38. Processor Boot Configuration Design" shows that SYS_BOOT14 >>> and 15 are physically lcd_data14 and 15. >>> >>> "Table 12. Expansion Header P8 Pinout" shows that lcd_data14 and 15 are >>> GPIO0[10] and GPIO0[11] in MODE0. >>> >>> Section "8.1.1 LCD Pins" contains the warning: >>> >>> "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 Fig 39, I see that SYSBOOT[15:14] == 01b results in 24 MHz, whereas >>> 11b results in 26MHz, whose 8% difference may account for your ~5 sec >>> offset per minute. (If 24MHz is the default, I'm not sure.) >>> >>> Best, >>> Justin >>> >>> >>> >>> On Wednesday, January 4, 2017 at 5:12:24 AM UTC-8, cmbaker3 wrote: >>>> >>>> Johan, >>>> That pin is used during the boot operation. >>>> Check in the SRM for the default boot options. >>>> >>>> On 1/4/2017 5:39 AM, Johan Ribenfors wrote: >>>> >>>> We've recently found a strange problem. Repeatable across all eleven >>>> boards we've tried so far. >>>> >>>> When pin 32 on P8 (gpoi0[11]) is pulled high via a resistor on boot, >>>> the clock on the BBB runs ~7000 seconds slow a day. (~5 seconds a minute) >>>> >>>> If the pin is pulled low or left floating on boot, the clock keeps time. >>>> >>>> The device tree overlay was set to 0x37 for this pin - fast slew, >>>> output, pullup, mode 7, but changing this has no effect. >>>> >>>> We were using Debian 7.9 with various programs installed, a few device >>>> tree overlays applied and a custom cape when we noticed this, but it's >>>> still the case using the Debian 8.6 image with no modifications, no dto and >>>> no cape. >>>> >>>> We haven't been able to find anything online and don't really know >>>> where to start looking. >>>> >>>> Any ideas? >>>> -- >>>> 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. >>>> To view this discussion on the web visit https://groups.google.com/d/ms >>>> gid/beagleboard/e0647cb0-ac27-44ed-a11b-a6f71b7ef077%40googlegroups.com >>>> <https://groups.google.com/d/msgid/beagleboard/e0647cb0-ac27-44ed-a11b-a6f71b7ef077%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>>> >>>> >>>> -- >>>> Chad Baker Memphis, TN >>>> >>> -- >>> 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. >>> To view this discussion on the web visit https://groups.google.com/d/ms >>> gid/beagleboard/79bac7d6-3011-44b5-95ac-61c43cb8525c%40googlegroups.com >>> <https://groups.google.com/d/msgid/beagleboard/79bac7d6-3011-44b5-95ac-61c43cb8525c%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> >> -- >> Gerald >> >> ger...@beagleboard.org >> http://beagleboard.org/ >> gcol...@emprodesign.com >> >> -- >> 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/to >> pic/beagleboard/mFBxTSWl7Ro/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> beagleboard+unsubscr...@googlegroups.com. >> To view this discussion on the web visit https://groups.google.com/d/ms >> gid/beagleboard/CAHK_S%2Bc0%3DS__LXv5wbF_%2B9xP9chLWxErTbCvc >> xOyejQv8pASZw%40mail.gmail.com >> <https://groups.google.com/d/msgid/beagleboard/CAHK_S%2Bc0%3DS__LXv5wbF_%2B9xP9chLWxErTbCvcxOyejQv8pASZw%40mail.gmail.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 beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/beagleboard/CABCHBhJ9ga9%3DGa5%2BupB-y2y59DZDBqLsM2Rhv0Y5dL5tJbwuqg > %40mail.gmail.com > <https://groups.google.com/d/msgid/beagleboard/CABCHBhJ9ga9%3DGa5%2BupB-y2y59DZDBqLsM2Rhv0Y5dL5tJbwuqg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- Gerald ger...@beagleboard.org http://beagleboard.org/ gcol...@emprodesign.com -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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