Nathan Keltner and Josh Thomas of Atredis dove into hardware hacking with a focus on the Teridian System on Chip (SoC). The Teridian SoC is widely used in the smart meter market and is based on the Harvard Architecture.
Nathan and Josh explain the differences between the von Neumann and Harvard Architectures from an attackers perspective, and then give some specific examples of vulns and exploits.
As a bonus, Josh goes into the security issues with NAND.