Hello Igor,
I am using vanilla 4.4 for labomo-r1
it seems zram module is missing. Do you intend to compile the kernel with this option, please?
gr@bpi:~$ sudo modprobe -Rf zram
modprobe: FATAL: Module zram not found.
On raspbian, kernel 3.18.x-4.1.x, there is a kernel module "zram" useful for embedded systems... working fine (also using on my x86 laptop)
https://wiki.gentoo.org/wiki/Zram
Nice week-end,
Regards,
Guillaume