The firmware for the TPM(+a few functions more) chip in Chromebooks is Open Source. There was a presentation on it in 2018 whose slides can be found on https://

The firmware for the TPM(+a few functions more) chip in Chromebooks is Open Source. There was a presentation on it in 2018 whose slides can be found on https://web.archive.org/web/20211120005203/https://2018.osfc.io/uploads/talk/paper/7/gsc_copy.pdf https://web.archive.org/web/20211120005203/https://2018.osfc... You'd have to adapt it to the SoC you're running it on though. Have fun.