This patch adds support for getting the boot hart ID using new RISCV_EFI_BOOT_PROTOCOL in linux efi stub. While there is an existing solution of passing the boot hart ID through Device Tree, it doesn't work for ACPI. Hence an EFI protocol protocol is recommended which works for both DT and ACPI based platforms. The latest draft spec of this new protocol is available at https://github.com/riscv-non-isa/riscv-uefi/releases/download/1.0-rc2/RISCV_UEFI_PROTOCOL-spec.pdf This linux ptach can be found in: riscv_boot_protocol_rfc_v1 branch at https://github.com/vlsunil/linux.git This is tested in qemu with both u-boot and edk2 firmware changes. To test this patch with u-boot, we need u-boot to support this new protocol which can be found in: riscv_boot_protocol_rfc_v1 branch at https://github.com/vlsunil/u-boot.git Sunil V L (1): riscv/efi_stub: Add support for RISCV_EFI_BOOT_PROTOCOL drivers/firmware/efi/libstub/efistub.h | 15 ++++++++++++ drivers/firmware/efi/libstub/riscv-stub.c | 28 ++++++++++++++++++++--- include/linux/efi.h | 1 + 3 files changed, 41 insertions(+), 3 deletions(-) -- 2.25.1
