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By default, the arm SD card images built by the FreeBSD infrastructure are built using the minimal space possible. In usual practice, the code assumes that it shall expand the image to take all the available space in the SD card.

Here is how to defeat that if you wish:

• on your host build system:
  • burn the image to an SD card
  • mount the image via mount -t ufs /dev/daXs2a /mnt (where X may vary)
  • edit /mnt/etc/rc.conf
  • comment out the line growfs_enable=“YES”
  • umount /mnt
• on your target system:
  • install the SD card and boot normally.

You may then make manual changes to the partitioning, or whatever else you would like.

If you simply want to use the defaults instead, then do /etc/rc.d/growfs onestart.