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 ? 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.
