My suggestion, and it is just a suggestion, would to read the System Reference Manual.
http://www.elinux.org/Beagleboard:BeagleBoneBlack Gerald On Sun, Apr 20, 2014 at 10:17 AM, <[email protected]> wrote: > Hi, I want to change the boot order of the beaglebone black to USB disk-> > eMMC->others. What topics should I study? I also want to remove the boot > button. I want it such that whenever the U-Boot would search in the USB for > linux image. > > Thanks. > > > On Tuesday, October 29, 2013 10:21:09 PM UTC+8, Gerald wrote: > >> Correct. Unless you want to change the boot mode. >> >> Gerald >> >> >> >> On Tue, Oct 29, 2013 at 9:05 AM, <[email protected]> wrote: >> >>> So I should not input high,low either . >>> I undertood. Thank you. >>> >>> 2013年10月28日月曜日 22時14分01秒 UTC+9 Gerald: >>>> >>>> A. The pins cannot float. They are already terminated on the board, >>>> either hi or lo. >>>> >>>> Gerald >>>> >>>> >>>> >>>> On Sun, Oct 27, 2013 at 9:46 PM, <[email protected]> wrote: >>>> >>>>> Hi, >>>>> Please tell me about correct circuitry to use boot pins as input, >>>>> >>>>> I use Beaglbone Black and want to use these pins, >>>>> especially eQep counter pins P8-33,35,41,42 that match to SYS_BOOT >>>>> 4,5,12,13. >>>>> >>>>> In SRM (ver A6) p104 it says, >>>>> "If you plan to use any of these signals, then on power up, these pins >>>>> should not be driven." >>>>> >>>>> Which of below is correct circuitry? >>>>> A) Attach pins to ground until SYS_RESETn goes high. >>>>> B) Keep pins floated until SYS_RESETn goes high. >>>>> >>>>> A is easier, because it can be done by switching 1 relay pulling all >>>>> pins to ground. >>>>> For B, I need plenty relays. >>>>> >>>>> Thanks, >>>>> Tohru >>>>> >>>>> >>>>> 2013年4月12日金曜日 4時20分23秒 UTC+9 DarkHelmet: >>>>> >>>>>> You can absolutely use them for other usages, once the value has been >>>>>> latched at boot they can be re purposed It may be necessary >>>>>> to strengthen the pull up/down on those lines with external resistors >>>>>> though. I've encountered an issue where my TTL inputs were pulling the >>>>>> lines low at boot while the CPU latched the config, preventing it to boot >>>>>> from the correct configuration. Resistors of ~50k seem to do the trick. >>>>>> >>>>>> On Friday, April 5, 2013 6:04:18 AM UTC-4, [email protected] wrote: >>>>>>> >>>>>>> Hi, >>>>>>> >>>>>>> I've a beaglebone with the XAM3359Z0Z, >>>>>>> >>>>>>> >>>>>>> I discovered that there is 19 pins dedicated to the boot >>>>>>> configuration. >>>>>>> The documentation said that depending of the position of the switch, >>>>>>> The beaglebone will boot with the sd card, uart, ..... . >>>>>>> ( http://processors.wiki.ti.com/index.php/AM335X_StarterWare >>>>>>> _Booting_And_Flashing#Boot_Modes) >>>>>>> >>>>>>> >>>>>>> I wanted to know if it is possible to use these pins for an another >>>>>>> usage? How ? I don't need an another boot mode, the default one is >>>>>>> enough >>>>>>> for me. >>>>>>> >>>>>>> >>>>>>> >>>>>>> Thank you in advance for your help, >>>>>>> >>>>>> -- >>>>> 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/groups/opt_out. >>>>> >>>> >>>> -- >>> 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/groups/opt_out. >>> >> >> -- > 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. > -- 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.
