Right, it's not Parazyd's image. Kernel cross-compilation is possible by arm-none-eabi-gcc (I did it this way). But I did not find the crypt library there, which I used for re-compiling the system V init process. I did not find other toolchains in the Devuan mirrors. It is very possible I'm not aware of simpler steps. It was already pinned in my debootstrapped image - I just left the pinning there. Yes, Devuan Jessie uses udev. But in the absence of an initrd, as in my case, the loopback lo device is not mounted before udev starts net.agent, which waits for lo and hangs the boot for 30 seconds, until it times out. Also udev is not needed for hotplug on the N900, right? That's why I did it this way. Using udev would be probably cleaner, but I think needs modifications of udev itself to avoid the boot delay. Thanks for reading and for the useful comments!