Thanks Robert! I issued a pull request with a couple minor changes to add a variable where you explained: https://github.com/RobertCNelson/boot-scripts/pull/124
Here's the text of the pull request that describes how it could be used to make a smaller image size than the size of your microSD card: Setting the conf_rootfs_partition_size variable allows for better control over the size of the microSD card necessary to house the resulting image when running the beaglebone-black-make-microSD-flasher-from-eMMC.sh script. For example, you might be working with a 32GB microSD card image, but want to generate an image that would also fit on a 4GB microSD card, so you could do the following: sudo conf_rootfs_partition_size=7462912 /opt/scripts/tools/eMMC/beaglebone-black-make-microSD-flasher-from-eMMC.sh Which would specify the size as 7462912 sectors, which is the size of the eMMC rootfs partition (at least on the one I was testing on). After making the flasher you could then use dd to get the image off the microSD card for flashing onto other microSD cards: sudo dd if=<path to microSD card device> of=<path to image file> bs=512 count=7471104 7471104 can be determined by the output from fdisk -l (one more than the End sector, or 8192 more than the size of the rootfs partition): Device Boot Start End Sectors Size Id Type /dev/mmcblk0p1 * 8192 7471103 7462912 3.6G 83 Linux You may be able to speed up the dd command by using a bigger blocksize and adjusting the count accordingly (using a 4MB block size): sudo dd if=<path to microSD card device> of=<path to image file> bs=419430 count=912 On Thursday, April 22, 2021 at 7:58:42 AM UTC-6 RobertCNelson wrote: > On Thu, Apr 22, 2021 at 8:26 AM John Allwine <[email protected]> wrote: > > > > How about changing the partition size in the make flasher script? Could > there be an option to make it the same size as the eMMC? Where is the > partition size determined? > > > https://github.com/RobertCNelson/boot-scripts/blob/master/tools/eMMC/functions.sh#L1311-L1318 > > LC_ALL=C sfdisk ${sfdisk_options} "${destination}" <<-__EOF__ > ${sfdisk_boot_startmb},,${sfdisk_fstype},* > > Change to: > ${sfdisk_boot_startmb},${some new var for size},${sfdisk_fstype},* > > Regards, > > -- > Robert Nelson > https://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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/50005372-feee-4683-b772-0cedc21c9be6n%40googlegroups.com.
