beaglebone-black-make-microSD-flasher-from-eMMC set sd partition size

Colin_Bester · January 28, 2022, 9:54pm

It seems that when running beaglebone-black-make-microSD-flasher-from-eMMC.sh (am33x-v3.8) that it utilized the entire SD card size when creating image. Is there a convenient way to limit the size of partitions to smaller size (say 4GB) as opposed to entire SD card.

This is no biggie but was wondering.

~C

RobertCNelson · January 28, 2022, 10:29pm

A user did merge in a conf_rootfs_partition_size variable…

    LC_ALL=C sfdisk ${sfdisk_options} "${destination}" <<-__EOF__
${sfdisk_boot_startmb},${conf_rootfs_partition_size},${sfdisk_fstype},*
__EOF__

github.com

RobertCNelson/boot-scripts/blob/master/tools/eMMC/functions.sh#L1288-L1320


      
          conf_rootfs_partition_size=${conf_rootfs_partition_size:-""}
          conf_boot_startmb=${conf_boot_startmb:-"4"}
          sfdisk_fstype=${sfdisk_fstype:-"L"}
          if [ "x${sfdisk_fstype}" = "x0x83" ] ; then
            sfdisk_fstype="L"
          fi
          boot_label=${boot_label:-"BEAGLEBONE"}
          if [ "x${boot_label}" = "xBOOT" ] ; then
            boot_label="rootfs"
          fi
          
          sfdisk_options="--force --Linux --in-order --unit M"
          sfdisk_boot_startmb="${conf_boot_startmb}"
          
          test_sfdisk=$(LC_ALL=C sfdisk --help | grep -m 1 -e "--in-order" || true)
          if [ "x${test_sfdisk}" = "x" ] ; then
            echo_broadcast "sfdisk: [2.26.x or greater]"
            if [ "x${bootrom_gpt}" = "xenable" ] ; then
              sfdisk_options="--force --label gpt"
            else

This file has been truncated. show original

So you could specify conf_rootfs_partition_size in /boot/SOC.sh

github.com

RobertCNelson/boot-scripts/blob/master/tools/eMMC/functions.sh#L1115


      
            generate_line 40
            dd if=${drive} of=/dev/null bs=1M count=108
            sync
            generate_line 40
            flush_cache
            echo_broadcast "==> Erasing: ${drive} complete"
            generate_line 40
          }
          
          loading_soc_defaults() {
          	local soc_file="/boot/SOC.sh"
          	empty_line
          	if [ -f ${soc_file} ] ; then
          		generate_line 40
          		echo_broadcast "==> Loading ${soc_file}"
          		generate_line 60 '*'
          		cat ${soc_file}
          		generate_line 60 '*'
          		. ${soc_file}
          		echo_broadcast "==> Loaded"
          	else

Regards,

Colin_Bester · January 28, 2022, 11:17pm

Thanks, I assume this is with a much newer image as I don’t see any function.sh

I will check if apt-get update works or not, thanks

RobertCNelson · January 28, 2022, 11:20pm

This is a git repo under /opt/scripts/

Careful, do not do a full git pull… there are a lot of things in there for newer Distro’s and has not been tested on 3.8.x

Regards,

Colin_Bester · January 28, 2022, 11:53pm

Gotcha.