What is TPM PCR?
Quick note explaining TPM PCR for BIOS/UEFI and embedded firmware readers.
What is TPM PCR?
A TPM PCR is a Platform Configuration Register that stores boot measurements through extend operations.
Why it matters
- Explains firmware trust and protection mechanisms.
- Helps debug Secure Boot, measured boot, and variable-protection behavior.
- Useful when reviewing boot security policy.
Practical example
Example: Secure Boot decides whether an image is allowed to run; Measured Boot records what actually ran.
Quick checklist
- Which policy or key database is involved?
- Is the image/variable signed or measured as expected?
- Do logs report authentication, measurement, or access-denied errors?
Quick takeaway
TPM PCR is a small concept, but it often becomes important when reading logs or debugging real firmware.
Related notes
- What is Measured Boot?
- What is TPM Event Log?
- What is TPM2 ACPI Table?
- What is SMM Lock?
- What is BIOS Lock?
Public references
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Nội dung liên quan
Một số bài viết, ghi chú hoặc project có liên quan đến nội dung bạn vừa đọc.
What is Measured Boot?
Quick note explaining Measured Boot for BIOS/UEFI and embedded firmware readers.
What is SMM Lock?
Quick note explaining SMM Lock for BIOS/UEFI and embedded firmware readers.
What is BIOS Lock?
Quick note explaining BIOS Lock for BIOS/UEFI and embedded firmware readers.
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