linuxboot | LinuxBoot project is working to enable Linux
kandi X-RAY | linuxboot Summary
kandi X-RAY | linuxboot Summary
Supported server mainboards === * qemu emulated Q35 systems * [Intel S2600WF] * [Dell R630] * Winterfell Open Compute node (works well) * Leopard Open Compute node (works well) * Tioga Pass Open Compute node (works well) * Monolake Open Compute node (not tested). Build instructions === Make sure you have installed the dependencies uuid-dev, nasm, and acpica-tools (or equivalent for your distribution). You need to provide: * The vendor UEFI firmware for the mainboard * A Linux kernel built with the CONFIG_EFI_BDS option enabled * An initrd.cpio file with enough tools to kexec the rest of the system. For the initrd, the [Heads firmware] or [u-root] systems work well. Both will build minimal runtimes that can fit into the few megabytes of space available. For everything except qemu, you’ll need to copy the vendor ROM dump to boards/$(BOARD)/$(BOARD).rom. Due to copyright restrictions, we can’t bundle the ROM images in this tree and you must supply your own ROM from your own machine. qemu can built its own ROM from the edk2 tree, so this is not necessary.
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QUESTION
I am literally confused about the use case of using LinuxBoot as the payload for Coreboot.
I learned that LinuxBoot can completely replace the UEFI's DXE and BDS phases, and then can load the bootloader (say GRUB) or even the Linux kernel directly.
Now, I also read that LinuxBoot can be used as the payload for Coreboot.
If LinuxBoot can do everything from platform initialization to loading kernel, then why would someone even put Coreboot in the sequence? Simply, why the use case of using LinuxBoot as Coreboot's payload exists? What role will Coreboot play?
...ANSWER
Answered 2018-Dec-09 at 12:45UEFI consists of multiple phases: SEC, PEI and DXE. LinuxBoot replaces the DXE phase, Coreboot replaces the SEC and PEI phases.
Coreboot is responsible for the platform initialization that cannot be done by Linux, such as DRAM initialization (it is also called "training") and ACPI table generation. Linux then works as a Coreboot payload, which does things such as PCI device enumeration, and loads the bootloader or can kexec()
into another Linux kernel.
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