On Thu, Apr 22, 2021 at 12:42 PM John Allwine <[email protected]> wrote: > > 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
Thanks all merged up! PS, you can add the variable to /boot/SOC.sh: https://github.com/RobertCNelson/boot-scripts/blob/master/tools/eMMC/functions.sh#L1114 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/CAOCHtYguU_aeeN5%2BKE-X0L%2Bfmt4hJ9wCSiqa29zSS%3DTSHLwznA%40mail.gmail.com.
