An example for sam9x25-ek:

make \
 PACK_UBI_MIN_IO_SIZE=2KiB \
 PACK_UBIFS_OPTS="-e 124KiB -c 1984" \
 PACK_UBI_OPTS="-p 128KiB -s 2048" \
 PACK_UBI_VOL_TYPE=dynamic \
 PACK_UBI_VOL_NAME=rootfs \
 PACK_UBI_VOL_FLAGS=autoresize \
 HSH_EXCLUDE_DOCS=1 ARCH=arm APTCONF=apt.conf.sisyphus.arm ve/generic.ubifs

https://bugzilla.altlinux.org/show_bug.cgi?id=27994#c0