PolarSSL is now part of ARM Official announcement and rebranded as mbed TLS.

ECC Certificate Support

Jan 10, 2018 22:55
User Anon

What is the current status for supporting ECC Certificates with named curves?

Jan 14, 2018 11:23
Ron Eldor

As you can see, Mbed TLS supports named curves.
X.509 certificates signed with ECC is supported as well.
Mbed TLS Team member