From: William Hermans <[email protected]> Reply-To: <[email protected]> Date: Monday, April 28, 2014 at 3:58 PM To: <[email protected]> Subject: Re: [beagleboard] Re: Booting Archlinux from microSD (again)
> I cannot even remember why we went down this road. > > Me either. except that the OP was concerned about making hardware > modifications to his/her board, and by extension having others do the same. > Something about ARCH Linux not working in this context, when I know that it > does. > > All i really wanted to stress is that reconfiguring the BBB hardware should > not have to be done. You are correct. I think I was answering OP's question regarding "booting from the SDCard no matter what is on the eMMC". Perhaps that is why I went down this rat hole. Sorry about that. Regards, John > > > > On Mon, Apr 28, 2014 at 3:32 PM, John Syn <[email protected]> wrote: >> >> From: William Hermans <[email protected]> >> Reply-To: <[email protected]> >> Date: Monday, April 28, 2014 at 3:11 PM >> To: <[email protected]> >> >> Subject: Re: [beagleboard] Re: Booting Archlinux from microSD (again) >> >>> John yeah I can not test that. All I have for a tty into uboot is an MSP430 >>> v1.5 Launchpad, with the MCU pulled to serve as a cheap way to get a >>> console AFTER uEnv.txt has loaded. This has to do with the fact that the >>> Launchpad is 9600 bps only, and from what I can tell uboot is hardwired at >>> 115200 bps until uEnv.txt is read and applied. >>> >>> What I mean all along when I say "boot/booting" is that I pull the kernel >>> from x.y.z location. Which is to say I know that comes from the uSD. As for >>> MLO / uboot ? I really do not know, what would happen if i completely erased >>> the eMMC ? >> Well, as Robert said, if the eMMC does not contain a MLO with a valid header, >> the BBB will look for an MLO on the next device in the boot sequence, which >> in this case is the SDCard. >> >> Regards, >> John >>> >>> >>> >>> On Mon, Apr 28, 2014 at 3:02 PM, William Hermans <[email protected]> wrote: >>>> upset me ? no you did not, but what Robert just said verifies what I've >>>> been saying all along. All you need is a good uEnv.txt. >>>> >>>> I am not an EE by ant stretch of the imagination, but I know I've been >>>> "booting" from uSD since at least June last year. So, when i say "I dont >>>> care about the schematics" I mean that MAYBE the hardware may be wired that >>>> way, but software can and will override( or at least seems this way ). >>>> >>>> End result, no having to pull x.y.z pin low, or whatever. You just use a >>>> config line in uEnv.txt. >>>> >>>> >>>> On Mon, Apr 28, 2014 at 12:40 PM, John Syn <[email protected]> wrote: >>>>> >>>>> From: Robert Nelson <[email protected]> >>>>> Reply-To: <[email protected]> >>>>> Date: Monday, April 28, 2014 at 12:08 PM >>>>> To: Beagle Board <[email protected]> >>>>> >>>>> Subject: Re: [beagleboard] Re: Booting Archlinux from microSD (again) >>>>> >>>>>> >>>>>> >>>>>> On Apr 28, 2014 1:28 PM, "John Syn" <[email protected]> wrote: >>>>>>> > >>>>>>> > >>>>>>> > On 4/28/14, 9:58 AM, "Robert Nelson" <[email protected]> wrote: >>>>>>> > >>>>>>>>> > >> >>>>>>>>> > >> I didn¹t mean to upset you and I apologize for that. Here is a >>>>>>>>> non book, >>>>>>>>> > >> hands on test that may help. Change the version of your u-boot on your >>>>>>>>> > >> SDCard and then reboot and see which version of u-boot is >>>>>>>>> displayed on >>>>>>>>> > >>the >>>>>>>>> > >> debug console. I¹m hoping that the u-boot version in the boot >>>>>>>>> console >>>>>>>>> > >>will >>>>>>>>> > >> not change or I¹ve got this completely wrong. >>>>>>>> > > >>>>>>>> > >As long as the bootrom finds a valid header in the MLO file, it'll >>>>>>>> > >boot from that device. (the mmc interface wired to the eMMC has >>>>>>>> > >priority over mmc interface wired to the microSD in the bootroom >>>>>>>> > >order). >>>>>>> > Hi Robert, >>>>>>> > >>>>>>> > Thanks for clearing this up. I was beginning to doubt myself. So to be >>>>>>> > clear, we need to remove the MLO from the eMMC to make the BBB boot >>>>>>> from >>>>>>> > the SDCard? >>>>>> That's one way, a good uEnv.txt is just easier. >>>>> >>>>> Exactly, and now I cannot even remember why we went down this road ;-) >>>>> >>>>> Thanks for all your help. >>>>> >>>>> Regards, >>>>> John >>>>>> What happens if there is a valid MLO on the eMMC and there is >>>>>>> > no u-boot on the eMMC? >>>>>> >>>>>> It should halt saying can't find uboot.img >>>>>> >>>>>> >>>>>> >>>>>> >>>>>>> > >>>>>>> > Regards, >>>>>>> > John >>>>>>>> > > >>>>>>>> > >Regards, >>>>>>>> > > >>>>>>>> > >-- >>>>>>>> > >Robert Nelson >>>>>>>> > >http://www.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] >>>>>>>> <mailto:beagleboard%[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] >>>>>>> <mailto:beagleboard%[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. >>>>> -- >>>>> 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. >> -- >> 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. -- 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.
