[mjg59]

It's up to your firmware to enable any CPU or chipset provided TPM implementation. The CPU supporting it is unhelpful unless the firmware provides a mechanism to turn it on.

[dataflow]

But my question wasn't "how do I check if the embedded TPM is being used?", it was "how do I check if an embedded TPM even exists?"

[mjg59]

It exists in everything x86 made since around 2014. Whether it exists usefully is up to your firmware.