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We're hopeful the recent attention will help us with finding hardware partners with aligned goals. It's a requirement for the devices to be at least as secure as a Pixel. That includes a modern mobile SoC and a comparable secure element to the Titan M implementing the same APIs.
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There are other kinds of secure elements available. The APIs needed by AOSP need to be implemented for them though. It's not provided out-of-the-box by anything else but many have support for signed applets in addition to their own firmware. You set it up to use your own keys.