# GRUB Strategy PartBoot currently uses stock GRUB/shim binaries and generates `grub.cfg`. PartBoot does not edit or build GRUB from source in this phase. This keeps Secure Boot, firmware compatibility, filesystem support, and maintenance risk lower than carrying a custom GRUB fork. Revisit source-level GRUB customization only when one of these is required: - embedded static config in the GRUB binary - custom GRUB modules not available in stock builds - a full signing pipeline for custom binaries