What is the relationship between Coreboot and Opensbi

[wjh-study]

When I start qemu-riscv,I want to know what is the relationship between coreboot and opensbi.
Is coreboot as zsbl before opensbi?Has anyone followed Coreboot？

[mateoconlechuga]

This is documented one the first page of the coreboot risc-v documentation: https://doc.coreboot.org/arch/riscv/index.html#additional-payload-handoff-requirements

[CodingVoid]

coreboot is basically the ZSBL like you said and OpenSBI provides the runtime services (SBI interface).
The bootflow is usually like this:
ROM code -> coreboot -> OpenSBI -> Payload (Linux kernel, bootloader ...)