I’ve got a question that doesn’t seem to be on the internet. A lot of people want to expand their partition size because 4GB can be limiting. My question is the opposite, I want to be able to shrink it. Every single time, while flashing, it (logically) expands the partition to the maximum amount of space. How can I install say a clean debian image onto the eMMC storage on the BeagleBone Black that is exactly 1.9GB?
Hi @aslansutu another user wanted that same feature, so they added it back on April 22nd 2021…
In /boot/SOC.sh add a variable conf_rootfs_partition_size with an integer value in MB’s (correction sectors)…
Regards,
The pull request gives an example of how to do it manually: added conf_rootfs_partition_size by jallwine · Pull Request #124 · RobertCNelson/boot-scripts · GitHub
Note that this method requires setting up a Beaglebone through the standard method and then rips the image off the eMMC and stores it with a specific rootfs size to an inserted microSD card. Then you can use that microSD card to flash the eMMC.
Blockquote
In /boot/SOC.sh add a variable conf_rootfs_partition_size with an integer value in MB’s…
I believe the conf_rootfs_partition_size is the number of 512 byte sectors.
@pocketnc_john good point… i was looking at sfdisk_boot_startmb, then I see, i postfix “M” on it… So yes conf_rootfs_partition_size is a sector number, unless you add an M or G at the end…
sfdisk_boot_startmb="${sfdisk_boot_startmb}M"
fi
echo_broadcast "==> sfdisk parameters:"
echo_broadcast "sfdisk: [$(LC_ALL=C sfdisk --version)]"
echo_broadcast "sfdisk: [sfdisk ${sfdisk_options} ${destination}]"
echo_broadcast "sfdisk: [${sfdisk_boot_startmb},,${sfdisk_fstype},*]"
echo_broadcast "==> Partitionning"
generate_line 60
LC_ALL=C sfdisk ${sfdisk_options} "${destination}" <<-__EOF__
${sfdisk_boot_startmb},${conf_rootfs_partition_size},${sfdisk_fstype},*
Regards,