Thanks Gerald! Did I reference the correct version (CircuitCo's GitHub)? -Justin
On Wed, Jan 4, 2017 at 3:15 PM, Gerald Coley <[email protected]> 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 <[email protected]> > 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 [email protected]. >>> 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 [email protected]. >> 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 > > [email protected] > http://beagleboard.org/ > [email protected] > > -- > 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/mFBxTSWl7Ro/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/beagleboard/CAHK_S%2Bc0%3DS__LXv5wbF_%2B9xP9chLWxErTbCvcxOyejQv8pASZ > w%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. 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