Regarding ARMv8M processor Cortex-M23

Hello,

I am looking for a development board and software development kit with ARMv8M processors Cortex-M23.

I need to prototype trusted applications in c/c++ programming language for my research work.

 I am expecting availability of development libraries along with the said board.

Can someone provide a pointer for availability of such board with proper documentation on its usage.

Thanks and Regards

Anil