Hello Alexander, >> If so, I have to add patch for mtd subsystem to always have device for master >> initialized regardless of kernel flag. >> Only to initialize struct device, not to create full mtd node. >> >> Miquel - are you agree to this? Conceptually yes, but please mind one thing: we do not break userspace. So if you want to keep the master mtd device, fine, but you need to do it in a consistent way so that people not enabling the kernel flag won't get a new device in their rootfs, shifting all indexes upwards. That being said, you are probably going in the right direction by doing that. Thanks, Miquèl