Hi I am stuck at the same point as abdulm, Can anyone help me out with link to select SDCARD as boot option.
Hi, > > I am facing a problem with Beaglebone black. I am unable to boot > MLO (and u-boot ) from SD card. When I hold the "Boot" button, only zImage > is being taken from the SD card but still the MLO (and u-boot ) are from > eMMC. It is not taking MLO( and u-boot) from SD card. So I deleted the MLO > (and u-boot) from eMMC, so that it may take from SD card as second > preference. But still it is not able to switch to SDcard and the board is > not booting now. Now I am unable to boot the board as eMMC is corrupted. > Can anyone suggest me how to change the boot mode without using the "boot" > switch as it has no effect and how to restore back the eMMC or any factory > settings can be done > > > On Thursday, December 5, 2013 1:21:23 PM UTC+5:30, William Hermans wrote: >> >> There are actually more than 3 boots options, and among them are what you >> covered, plus SPI, Ethernet( TFTP kernel / NFS root ), USB, and I know I am >> forgetting a couple more. >> >> To keep things in context with what you're asking however. LIke John says >> uEnv,txt has control over how the device boots. It has a sort of round >> robin check it does when bringing the hardware up. In the case of the SD >> card boot, the uEnv.txt file is only going to know about the sd card unless >> specifically modified to override default behavior. >> >> Now what you're talking about seems to be a flasher image type image. >> Which is to say, it is meant to flash the eMMC back to factory default, or >> to flash a newer more modern version of Angstrom or whatever image you >> have. If you want to boot exclusively off of the SD card, then you're going >> to have to work at it a bit. >> >> A jumper switch may seem like a better idea at first ( for boot options ) >> but it really is not. uboot boot options are vast . . . >> >> Anyways, you're going to have to ask yourself how serious you are about >> getting your device booting exclusively from the SD card. Because if you >> truly want to understand how it all works, you're going to need to >> understand uboot, and Linux better than it appears how well you know it >> now. Also, there are other options to consider. Which Linux distro do you >> want to use . . . and more questions to be answered yet. In short, you have >> your work cut out for you if you want to learn. Weeks, and perhaps even >> months. >> >> >> On Wed, Dec 4, 2013 at 8:43 PM, John Syne <jsyn...@us-power.com> wrote: >> >>> >>> >>> From: Gerald Coley <ger...@beagleboard.org> >>> Reply-To: <beagl...@googlegroups.com> >>> Date: Wednesday, December 4, 2013 at 4:55 PM >>> To: "beagl...@googlegroups.com" <beagl...@googlegroups.com> >>> Subject: Re: [beagleboard] How to make BeagleBone black boot off SD card >>> >>> Push and hold the boot button and apply power. >>> >>> http://www.elinux.org/Beagleboard:BeagleBoneBlack >>> >>> Gerald >>> >>> Let me clear something up that seems to be confusing everyone. Gerald is >>> correct from a hardware point of view; however this only selects which >>> u-boot environment is loaded. When the boot button is pressed, the u-boot >>> env is loaded from the SDCard and when the boot button isn’t pressed, the >>> eMMC u-boot env is loaded. From that point onwards the current u-boot env >>> checks to see if the SDCard is installed and if it is, u-boot boots from >>> the SDCard FAT partition. If the SDCard isn’t installed, it boots from the >>> eMMC FAT partition. Since the u-boot env is the same on both the SDCard and >>> the eMMC, it doesn’t matter if the boot button is pressed or not. It is the >>> uEnv.txt file that modifies u-boot env behavior by adding a “uenvcmd” line. >>> >>> I hope I haven’t confused everyone. >>> Regards, >>> John >>> >>> >>> >>> >>> On Wed, Dec 4, 2013 at 3:50 PM, <dmitr...@gmail.com> wrote: >>> >>>> Good afternoon, >>>> I don't understand how to determine whether the BBB is booting off the >>>> SD card or booting off the internal flash. >>>> Here's what happened, I installed a 4GB image from getting started >>>> section onto my SD card >>>> This was the first image here: >>>> http://beagleboard.org/latest-images >>>> >>>> >>>> Initially I powered on by holding the button next to SD card, It booted >>>> and I could tell it was not the internal image, because it did not have >>>> the >>>> demo applications. >>>> >>>> Next, I tried hitting the reset button to see if it will boot off the >>>> SD card again, nothing happened and I could not connect to the BBB any >>>> more. I scanned all ports and it was not available. >>>> >>>> I tried resetting and holding down the button again, but it would not >>>> boot off the SD card. >>>> >>>> Only when I take out the SD card the BBB boots into the original >>>> installation. >>>> >>>> Does anyone know what may have caused this? This is a brand new SD >>>> card, and I doubt I had damaged it by resetting the BBB. >>>> >>>> As far as I understand there are 3 booting options, >>>> >>>> 1. There is booting off internal NAND which only has 70mb (or is >>>> this only a partition >>>> 2. Booting off SD card >>>> 3. "If using BeagleBone Black and the image is meant to program >>>> your on-board eMMC, you'll need to wait while the programming occurs. >>>> When >>>> the flashing is complete, all 4 USRx LEDs will be lit solid. *This >>>> can take up to 45 minutes."* >>>> >>>> >>>> What I don't understand is how to select how the device boots. How can >>>> I make it boot off the SD card every time? How do I prevent it from >>>> writing >>>> to the NAND? I want to prevent damaging anything by overwriting the NAND >>>> and only work within an SD Card. >>>> >>>> Wouldn't it have been easier to install a jumper to select which memory >>>> the device boots from? >>>> >>>> Thanks, >>>> >>>> -- >>>> 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 beagleboard...@googlegroups.com. >>>> 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 beagleboard...@googlegroups.com. >>> 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 beagleboard...@googlegroups.com. >>> 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
