Skiboot

Skiboot (Skiboot): Late-stage boot firmware chainloaded by Hostboot after memory initialization. Performs wider platform initialization, including initialization of on-die PCI Express host bus controllers (PHBs). Also implements the OPAL runtime abstraction layer, which remains resident in memory and is called by the running operating system to invoke platform-specific functionality. Chainloads a Linux kernel and initramfs embedded in the mainboard's PNOR boot flash, usually Skiroot.

Skiboot settings are stored in nvram. Skiboot/NVRAM

Skiboot is open source.

References

• Skiboot source code (upstream)
• Skiboot source code (Talos II variant)
• Skiboot documentation