Partitioning SD card using Crochet build tool

I'm trying to create an image using Crochet build tool. Without changing the default settings, the SD card is partitioned as the following:

root@bananapi:~ # df -h
Filesystem        Size    Used   Avail Capacity  Mounted on
/dev/mmcsd0s2a    6.7G    2.7G    3.5G    43%    /
devfs             1.0K    1.0K      0B   100%    /dev
/dev/mmcsd0s1      32M    496K     31M     2%    /boot/msdos
/dev/md0           29M     24K     26M     0%    /tmp
/dev/md1           14M     72K     13M     1%    /var/log
/dev/md2           11M    8.0K     10M     0%    /var/tmp

What option should I use to change the volume of partitions like /tmp? And how can I separate the portions?
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