The serial number is injected into the firmware image before flashing, so after that you should be able to access it during the boot process.
At least, that is what happens when flashing PureBoot.
Any idea how to access it during the boot process? Or how to access any kind of BIOS config besides which device to boot?
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Press the Esc key, that should bring up many options. I remember a few of them off of memory, one enables/activates the TPM, another one runs a memory diagnostics test, and one of them lists the Coreboot version as well as CPU supported parameters.
If you are not able to find it, you can use the Coreboot script and see if the options relating to the serial number have been updated. If there is no serial number set, you will need to set it manually with the script and reflash Coreboot.
I went into coreinfo that way and looked around thoroughly but I don’t see anywhere for the serial number. I would have to swap the NVMe drives between laptops to check them with the script so if anyone knows of another way to check Coreboot for the serial number please let me know.
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