And i this helps as it helped me understand part of the process . . . http://git.denx.de/?p=u-boot.git;a=blob;f=include/configs/am335x_evm.h;hb=HEAD#l57
On Mon, Apr 28, 2014 at 6:09 PM, John Syn <[email protected]> wrote: > > 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]. >>>> > >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. > > -- > 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.
