Matt DeVillier d3b49b4cda payloads/Tianocore: Update default build target, simplify build options

Drop the deprecated COREBOOTPAYLOAD option, and replace it with MrChromebox's
updated UefiPayloadPkg option. Simplify the Kconfig options to make it easier
to build from upstream edk2 master. Drop the TIANOCORE_USE_8254_TIMER Kconfig
option since it applied only to CorebootPayloadPkg. Clean up the Makefile now
that we're only building from a single Tianocore package/target.

Test: build/boot qemu Q35 target with both UefiPayload and Upstream options.

Change-Id: If545fbd0c30be6dcc6ff43107b80980fa23a527e
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54019
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2021-05-13 08:30:57 +00:00

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Payloads

coreboot doesn't try to mandate how the boot process should look, it merely does hardware init and then passes on control to another piece of software that we carry along in firmware storage, the payload.

There is various software in that space that is either explicitly written as payload or can be made to work as one.

SeaBIOS

SeaBIOS is an open source implementation of the PCBIOS API that exists since the original IBM PC and was extended since. While originally written for emulators such as QEMU, it can be made to work as a coreboot payload and all the necessary code is in SeaBIOS' mainline code.

Tianocore

Tianocore is the open source reference implementation of the UEFI Specifications that modern firmware for PCs is based on. There were various projects in the past to make it suitable as a coreboot payload, but these days this function is available directly in the UefiPayloadPkg part of its source tree.

GRUB2

GRUB2 was originally written as a bootloader and that's its most popular purpose, but it can also be compiled as a coreboot payload.

Linux

There are several projects using Linux as a payload (which was the configuration that gave coreboot its original name, LinuxBIOS). That kernel is often rather small and serves to load a current kernel from somewhere, e.g. disk or network, and run that through the kexec mechanism.

Two aspects emphasized by proponents of Linux-as-a-payload are the availability of well-tested, battle-hardened drivers (as compared to firmware project drivers that often reinvent the wheel) and the ability to define boot policy with familiar tools, no matter if those are shell scripts or compiled userland programs written in C, Go or other programming languages.

Heads

Heads is a distribution that bundles coreboot, Linux, busybox and custom tools to provide reproducible ROMs. Heads aims to provide a secure and flexible boot environment for laptops and servers. It supports features like measured boot, kexec, GPG, OTP, TLS, firmware updates, but only works on a limited amount of mainboards. For more details have a look at heads-wiki.

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