` apply patch,
add "options KSTACK_PAGES=4" to your arm kernel config,
add:
```
vm.kmem_size_max=800m
vm.kmem_size=512m
vfs.zfs.arc_max=550m
``` to /boot/loader.conf
```
to /boot/loader.conf
make kernel world UBLDR_LOADADDR=0x42000000
``` (address is your hardware dependant, here is Allwinner A)
(address is your hardware dependant, here is Allwinner A)
create zfs FreeBSD system just build on the hard disk
set loaderdev enviroment variable in u-boot to "zfs <your pool>"
or make it empty`