This series implements support for launching U-Boot as an EFI payload on ARM64 devices that already have an EFI capable bootloader.
Patches 9 through 14 in tandem with another series [1] provide all the pieces necessary to build and run U-Boot on Snapdragon X Elite laptops. They're only here to demonstrate the usecase and either already have or will be sent separately, they should not be reviewed as part of this RFC.
Initial support is provided for: * Building U-Boot with an EFI stub on ARM64 * Inheriting DRAM banks from the EFI memory map * Creating a framebuffer node in the OF tree based on EFI GOP info
This allows for booting Linux on top of U-Boot's EFI implementation on Qualcomm Snapdragon X Elite platforms.
The primary motivation for this is to provide a more standard EFI interface on devices like Qualcomm powered Windows laptops. While these devices ship an EFI capable bootloader, it has no understanding of devicetree, requiring distros (or more often, users) to handle devicetree selection and applying necessary fixups.
Additionally, the EFI implementation on these devices is often very far from being systemready compliant, with a variety of bugs like broken keyboards, crashes in OS loaders like systemd-boot, and other small idiosyncrocies.
As a result, simply running U-Boot as an EFI app isn't a suitable solution.
[1]: 20241124-b4-modernise-smem-v1-0-b7852c11b67c@linaro.org
--- Caleb Connolly (10): cmd: efi: avoid unitialized read efi: stub: support running U-Boot as an EFI payload on ARM64 efi: move efi_info_get() to a new header file efi: stub: add helpers to populate memory map and framebuffer efi: stub: add additional types of memory efi: stub: log EFI memory banks efi: stub: add known memory to U-Boot's EFI memory map mach-snapdragon: support booting with EFISTUB common/board_f: init malloc earlier configs: add x1e_defconfig
Neil Armstrong (4): clk: qcom: Add X1E80100 clock driver qcom_defconfig: enable X1E80100 clock driver pinctrl: qcom: Add X1E80100 pinctrl driver qcom_defconfig: enable X1E80100 pinctrl driver
Makefile | 15 +- arch/arm/cpu/armv8/config.mk | 11 + arch/arm/include/asm/global_data.h | 3 + arch/arm/lib/Makefile | 2 + arch/arm/mach-snapdragon/board.c | 15 ++ arch/arm/mach-snapdragon/dram.c | 15 +- arch/arm/mach-snapdragon/qcom-priv.h | 2 + arch/x86/cpu/efi/payload.c | 32 +-- board/qualcomm/efistub.env | 11 + cmd/efi.c | 3 +- common/board_f.c | 2 +- configs/qcom_defconfig | 2 + configs/x1e_defconfig | 17 ++ drivers/clk/qcom/Kconfig | 8 + drivers/clk/qcom/Makefile | 1 + drivers/clk/qcom/clock-x1e80100.c | 348 ++++++++++++++++++++++++++++++++ drivers/pinctrl/qcom/Kconfig | 7 + drivers/pinctrl/qcom/Makefile | 1 + drivers/pinctrl/qcom/pinctrl-x1e80100.c | 100 +++++++++ drivers/video/efi.c | 1 + include/efi.h | 27 +-- include/efi_stub.h | 67 ++++++ lib/efi/Kconfig | 9 +- lib/efi/Makefile | 28 ++- lib/efi/efi_app.c | 1 + lib/efi/efi_info.c | 165 +++++++++++++++ lib/efi/efi_stub_arm64.c | 237 ++++++++++++++++++++++ lib/efi/{efi_stub.c => efi_stub_x86.c} | 1 + lib/efi_loader/efi_memory.c | 5 + lib/of_live.c | 9 + 30 files changed, 1072 insertions(+), 73 deletions(-) --- base-commit: 1e327ec30e48902fff65fb58337b8f80cc526f08
// Caleb (they/them)