According to kernel developer Wolfram Sang, problems are causing the overloading of the maintainers who can hardly keep up any more with the incorporation of patches in the kernel. Basic devices were also a topic: the microcontrollers from ARM’s Cortex-M series (which are used for applications such as smart metering, human interface devices, automotive and industrial control systems, white goods, consumer products and medical instrumentation. Ed.) have no memory management unit (MMU), which requires appreciable differences in development. As a consequence uClinux uses its own format for binaries for devices without a MMU.