Щаз же, вроде, Cortex-M0 и Cortex-M3 уже бесплатно раздают. Оплата только royalty.
Arm DesignStart is the ideal starting point for a custom SoC – being able to use both the Cortex-M0 and Cortex-M3 CPUs with a $0 license, just a success-based, royalty-only model, means that our customers can save on costs and reduce risk.