libpayload is a small BSD-licensed static library (a lightweight implementation of common and useful functions) intended to be used as a basis for coreboot payloads.
The benefits of linking a coreboot payload against libpayload are:
Payloads do not have to implement and maintain low-level code for I/O, common functions, etc.
Payloads can be recompiled and deployed for CPU architectures supported by coreboot in the future.
The libpayload functions can be tested and scrutinized outside payload development.
Payloads themselves may be partly host-tested, e.g. against an emulation libpayload.
