Patrick Wicki enhanced the systemd/systemd repository by improving TPM2 PCR bank handling for environments lacking EFI support. He addressed a bug that previously caused cryptenroll and cryptsetup attach operations to fail when explicit PCR bank settings were unavailable. By introducing a fallback mechanism that intelligently guesses active PCR banks, Patrick ensured these disk encryption workflows remain reliable and automated across diverse hardware. His work involved targeted modifications in C, focusing on system programming and security. The patch reduced manual configuration and prevented -EOPNOTSUPP errors, demonstrating a thoughtful, low-risk approach to increasing provisioning robustness in TPM2-backed encryption scenarios.