General discussion • errata for Raspberry Pi 4 Boot Security whitepaper

https://pip.raspberrypi.com/categories/ ... curity.pdf

RP-004651-WP

The overhead of verifying a minimal boot.img (about 9MB) is approximately 3.5 seconds, which directly influences the boot time. Most of this is the CPU overhead of the SHA256 calculation, and hence unavoidable.

The Pi 4 eats FAT12 images and I have gotten ~4 MB archives to work and the RSA verify process takes ~1 sec with turbo. With cd start.elf it could probably be even smaller. Just a note

Statistics: Posted by wcl55 — Tue Jun 24, 2025 3:40 pm

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