[PATCH 00/32] arm: Support building as an EFI app
Heinrich Schuchardt
xypron.glpk at gmx.de
Thu Feb 6 11:55:55 CET 2025
On 2/3/25 18:41, Simon Glass wrote:
> The original x86 EFI-app was written back in 2015, about a year before
> the EFI-loader was introduced. At that point, ARM mostly used U-Boot and
> FIT (Flat Image Tree).
>
> Today, sadly, there are a few efforts to re-invent FIT poorly, to cater
> to more primitive boot-environments than U-Boot. One justification for
> this re-invetion has been that EDK2 did not support FIT.
>
> EDK2 does now support FIT but only for the firmware stage. Even then,
> vendors tend to use their own forks, so any new features are slow to
> make it into the market.
>
> EDK2 also supports the ext4 filesystem, but many devices don't include
> that feature, so most distros make use of FAT for storing their boot
> files. Since FAT is not journalled, it is not particularly reliable in
> the face of reset, power failure, etc.
>
> As an interim measure, we can use U-Boot as an EFI app running on top of
> whatever EDK2 fork is in use. This allows use of modern features such as
> FIT and filesystems other than FAT. So far this only supports x86, but
> recent ARM laptops are making use of EFI too.
>
> So this series adds an EFI app for 64-bit ARM.
>
> Note: Since U-Boot does not support EFI's GOP 'blt-only' mode, the
> vidconsole does not operate, but it can still be used, since EDK2
> handles drawing instead of U-Boot. As a result, the U-Boot logo is not
> shown.
Thank you Simon for going through this effort to generalize the EFI app.
The EFI app should build on all EFI architecture. Will you add RISC-V
support, too?
Best regards
Heinrich
>
>
> Simon Glass (32):
> Convert build-efi script to Python
> Makefile: Avoid using TEXT_BASE if not present
> video: Move vesa_setup_video_priv() into its own file
> video: Use a local mode_info struct in the EFI driver
> lib: Provide fdtdec_get_pci_bar32() only with PCI enabled
> scripts: Update build-efi to support building U-Boot
> scripts: Update build-efi to support arm64
> efi: Rename app and payload to include x86
> efi: Allow board/efi Kconfig to be used outside x86
> efi: x86: Move EFI SDRAM-handling into a common file
> efi: x86: Rework VENDOR_EFI option to permit other archs
> efi: x86: Allow setting the global_data pointer with EFI
> efi: Tidy up setup of global_data
> efi: Rename ImageBase to image_base
> efi: lmb: Avoid access to _start
> efi: arm: Don't do the EL2 switch when running under EFI
> efi: arm: Avoid allocating page tables when running under EFI
> efi: arm: Avoid enabling caches when running under EFI
> efi: arm: Implement access to global_data for EFI
> efi: arm: Omit the ARM start-up code in the EFI app
> efi: arm: Drop exception code when running as an EFI app
> efi: arm: Allow use of the EFI table in the app
> efi: arm: Disable --gc-sections for the app
> efi: arm: Drop startup code from the app
> efi: arm: Adjust how the monitor length is calculated
> efi: arm: Select the EFI linker script for the app
> efi: arm: Provide startup and relocation code
> efi: Generate the app as a shared library
> efi: arm: Disable STATIC_RELA for the EFI app
> efi: arm: Use EFI flags for all compilation with the app
> efi: arm: Simplify the crt0 file and update link script
> efi: arm: Add an EFI app for arm64
>
> Kconfig | 1 +
> MAINTAINERS | 6 +-
> Makefile | 8 +-
> arch/Kconfig | 2 +
> arch/arm/Kconfig | 6 +-
> arch/arm/Makefile | 2 +
> arch/arm/config.mk | 12 ++
> arch/arm/cpu/armv8/Makefile | 4 +-
> arch/arm/cpu/armv8/config.mk | 7 +-
> arch/arm/dts/efi-arm_app.dts | 31 +++
> arch/arm/include/asm/global_data.h | 16 +-
> arch/arm/lib/Makefile | 12 +-
> arch/arm/lib/bootm.c | 7 +-
> arch/arm/lib/cache.c | 3 +
> arch/arm/lib/crt0_aarch64_efi.S | 158 +++-----------
> arch/arm/lib/elf_aarch64_efi.lds | 49 +++--
> arch/riscv/lib/crt0_riscv_efi.S | 28 +--
> arch/x86/Kconfig | 4 +-
> arch/x86/cpu/efi/Makefile | 1 -
> arch/x86/include/asm/global_data.h | 7 +
> board/efi/Kconfig | 41 +++-
> board/efi/efi-arm_app/Kconfig | 16 ++
> board/efi/efi-arm_app/MAINTAINERS | 13 ++
> board/efi/efi-arm_app/Makefile | 5 +
> board/efi/efi-arm_app/board.c | 18 ++
> board/efi/efi-arm_app/efi-arm_app.env | 11 +
> board/efi/efi-x86_payload/Kconfig | 2 +-
> common/board_f.c | 4 +-
> common/board_r.c | 9 +-
> configs/efi-arm_app64_defconfig | 51 +++++
> configs/efi-x86_app32_defconfig | 4 +-
> configs/efi-x86_app64_defconfig | 4 +-
> configs/efi-x86_payload32_defconfig | 4 +-
> configs/efi-x86_payload64_defconfig | 4 +-
> doc/develop/uefi/u-boot_on_efi.rst | 21 +-
> drivers/pci/pci_rom.c | 32 ---
> drivers/video/Makefile | 2 +
> drivers/video/efi.c | 1 +
> drivers/video/vesa_helper.c | 41 ++++
> include/asm-generic/sections.h | 2 +
> include/vesa.h | 2 +
> lib/efi/Kconfig | 2 +-
> lib/efi/Makefile | 1 +
> lib/efi/efi_app.c | 13 +-
> {arch/x86/cpu => lib}/efi/sdram.c | 1 -
> lib/fdtdec.c | 2 +
> lib/lmb.c | 3 +-
> scripts/build-efi.py | 293 ++++++++++++++++++++++++++
> scripts/build-efi.sh | 207 ------------------
> 49 files changed, 719 insertions(+), 454 deletions(-)
> create mode 100644 arch/arm/dts/efi-arm_app.dts
> create mode 100644 board/efi/efi-arm_app/Kconfig
> create mode 100644 board/efi/efi-arm_app/MAINTAINERS
> create mode 100644 board/efi/efi-arm_app/Makefile
> create mode 100644 board/efi/efi-arm_app/board.c
> create mode 100644 board/efi/efi-arm_app/efi-arm_app.env
> create mode 100644 configs/efi-arm_app64_defconfig
> create mode 100644 drivers/video/vesa_helper.c
> rename {arch/x86/cpu => lib}/efi/sdram.c (94%)
> create mode 100755 scripts/build-efi.py
> delete mode 100755 scripts/build-efi.sh
>
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