b62f86be43
This adds another external payload to coreboot. The payload has been heavily based on u-boots UEFI implementation. The leanefi payload is basically a translator from coreboot to UEFI. It takes the coreboot tables and transforms them into UEFI interfaces. Although it can potentially load any efi application that can handle the minimized interface that leanefi provides, it has only been tested with LinuxBoot (v6.3.5) as a payload. It has been optimized to support only those interfaces that Linux requires to start. Among other leanefi does not support: - efi capsule update (also efi system resource table) - efi variables - efi text input protocol (it can only output) - most boot services. mostly memory services are left (e.g. alloc/free) - all runtime services (although there is still a very small runtime footprint that is planned to be removed in the near future) - TCG2/TPM (although that is mostly because of laziness) The README.md currently provides more details on why. The payload currently only supports arm64 and has only been tested on emulation/simulator targets. The original motivation was to get ACPI on arm64 published to the OS without using EDK2. It is however also possible to supply the leanefi with a FDT that is published to the OS. At that point one would however probably use coreboot only instead of this shim layer on top. It would be way nicer to have Linux support something else than UEFI to propagate the ACPI tables, but it requires to get the Linux maintainer/community on board. So for now this shim layer ciruimvents that. LBBR Test: // 1. dump FDT from QEMU like mentioned in aarch64 coreboot doc // 2. compile u-root however you like (aarch64) // 3. compile Linux (embed u-root initramfs via Kconfig) // 4. copy Linux kernel to payloads/leanefi/Image // 5. copy following coreboot defconfig to configs/defconfig: CONFIG_BOARD_EMULATION_QEMU_AARCH64=y CONFIG_PAYLOAD_NONE=n CONFIG_PAYLOAD_LEANEFI=y CONFIG_LEANEFI_PAYLOAD=y CONFIG_LEANEFI_PAYLOAD_PATH="[path-to-linux]/arch/arm64/boot/Image" CONFIG_LEANEFI_FDT=y CONFIG_LEANEFI_FDT_PATH="[path-to-dumped-DTB]" // 6. compile coreboot make defconfig make -j$(nproc) // 7. run qemu like mentioned in coreboot doc (no FIT) // 8. say hello to u-root and optionally kexec into the next kernel Signed-off-by: Maximilian Brune <maximilian.brune@9elements.com> Change-Id: I4093378e89c3cb43fb0846666de80a7da36b03f1 Reviewed-on: https://review.coreboot.org/c/coreboot/+/78913 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Ron Minnich <rminnich@gmail.com> Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de> |
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| .. | ||
| BOOTBOOT | ||
| coreDOOM | ||
| depthcharge | ||
| edk2 | ||
| FILO | ||
| GRUB2 | ||
| iPXE | ||
| leanefi | ||
| linux | ||
| LinuxBoot | ||
| Memtest86Plus | ||
| SeaBIOS | ||
| skiboot | ||
| tint | ||
| U-Boot | ||
| .gitignore | ||
| Makefile.mk | ||