Do you know embedded or mobile commodity hardware that integrate ARM-based processors and which does not support ARM's TrustZone? Do I have to assume that any commodity device (e.g. OMAP platform) which integrates a TrustZone-ready processor (Cortex-A9 and higher) automatically supports these seucrity extensions?
The hardware could integrate simple microcontrollers (Cortex-M) or more complex system-on-a-chip hardware (e.g. general purpose OMAP processors).
A few devices for which I am not sure whether they support TrustZone or TI's M-Shield are: LG Optimus 3D P920, LG Prada, Samsung Galaxy SI / SII, Motorola Droid Bionic, Motorola Atrix 2.