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coreboot is an Open Source project aimed at replacing the proprietary BIOS (firmware) found in most computers. coreboot performs a little bit of hardware initialization and then executes additional boot logic, called a payload. With the separation of hardware initialization and later boot logic, coreboot can scale from specialized applications that run directly from firmware, run operating systems in flash, load custom bootloaders, or implement firmware standards, like PC BIOS services or UEFI. This allows for systems to only include the features necessary in the target application, reducing the amount of code and flash space required. http://www.coreboot.org/
CorebootModulePkg - Source code package of Coreboot Support Modules that will be used to parse the coreboot tables in memory , report memory/io resources and install acpi and smbios tables from coreboot into EFI system tables.
CorebootPayloadPkg - Source code package of Coreboot Payload Modules, Provides definitions of payload image's layout and lists the modules required in DSC file.
Intel holds the key programming information that is crucial for initializing Intel silicon. The Intel® Firmware Support Package (FSP) is a binary distribution of the silicon initialization code that is needed to initialize the Intel silicon. The FSP will perform the necessary initialization steps as documented in the BWG / BIOS Specification including initialization of the CPU, memory controller, chipset and certain bus interfaces, if necessary. The FSP provides chipset and processor initialization in a format that can easily be incorporated into many boot loaders including coreboot. http://www.intel.com/fsp
Coreboot in itself is "only" minimal code for initializing hardware. It does not have the media drivers nor does it provide services required by an OS. After the initialization, it jumps to a payload which can provide services required to load and boot an OS. http://www.coreboot.org/Payloads
UEFI payload provides UEFI services on top of coreboot that allows UEFI OS boot.