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Arm backend: Avoid Ethos-U SDK re-downloads #21970

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Merged
Erik-Lundell merged 2 commits into from
Aug 20, 2026
+16 −14
Merged

Arm backend: Avoid Ethos-U SDK re-downloads #21970

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8de3878
Arm backend: Avoid Ethos-U SDK re-downloads
Erik-Lundell Aug 19, 2026
8703cc4
Merge branch 'main' into dont-download-ethosu
Erik-Lundell Aug 20, 2026
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30 changes: 16 additions & 14 deletions backends/arm/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -13,11 +13,8 @@ if(NOT EXECUTORCH_ROOT)
endif()

include(${EXECUTORCH_ROOT}/tools/cmake/Utils.cmake)

if(POLICY CMP0169)
# Allow FetchContent_Populate to be used for source-only fetch
cmake_policy(SET CMP0169 OLD)
endif()
include(${EXECUTORCH_ROOT}/backends/arm/scripts/corstone_utils.cmake)
include(${EXECUTORCH_ROOT}/backends/arm/cmake/ArmEthosUSDK.cmake)

set(_common_include_directories
${EXECUTORCH_ROOT}/.. ${EXECUTORCH_ROOT}/runtime/core/portable_type/c10
Expand All @@ -43,7 +40,13 @@ set(ETHOS_SDK_PATH
"${EXECUTORCH_ROOT}/examples/arm/arm-scratch/ethos-u"
CACHE PATH "Path to Ethos-U bare metal driver/env"
)
option(FETCH_ETHOS_U_CONTENT "Fetch ethos_u dependencies" ON)
# Set default value of FETCH_ETHOS_U_CONTENT depending on whether ethos sdk is
# available in $ETHOS_SDK_PATH.
arm_ethos_u_default_fetch("${ETHOS_SDK_PATH}" _fetch_ethos_u_default)
option(FETCH_ETHOS_U_CONTENT
"Fetch ethos_u dependencies instead of relying on pre-downloads"
${_fetch_ethos_u_default}
)

if(EXECUTORCH_BUILD_ARM_BAREMETAL AND EXECUTORCH_BUILD_ARM_ETHOSU_LINUX)
message(
Expand Down Expand Up @@ -75,10 +78,9 @@ if(EXECUTORCH_BUILD_ARM_BAREMETAL OR EXECUTORCH_BUILD_ARM_ETHOSU_LINUX)
executorch_delegate_ethos_u
PRIVATE ${EXECUTORCH_ROOT}/backends/arm/runtime/EthosUBackend_Cortex_M.cpp
)
include(${EXECUTORCH_ROOT}/backends/arm/scripts/corstone_utils.cmake)
if(FETCH_ETHOS_U_CONTENT)
fetch_ethos_u_content(${ETHOS_SDK_PATH} ${EXECUTORCH_ROOT})
endif()
arm_ensure_ethos_u_content(
"${ETHOS_SDK_PATH}" "${EXECUTORCH_ROOT}" ${FETCH_ETHOS_U_CONTENT}
)
set(DRIVER_ETHOSU_INCLUDE_DIR
"${ETHOS_SDK_PATH}/core_software/core_driver/include"
)
Expand Down Expand Up @@ -108,11 +110,11 @@ if(EXECUTORCH_BUILD_ARM_BAREMETAL OR EXECUTORCH_BUILD_ARM_ETHOSU_LINUX)
GIT_REPOSITORY ${ETHOSU_LINUX_DRIVER_GIT_REPO}
GIT_TAG ${ETHOSU_LINUX_DRIVER_GIT_TAG}
GIT_SHALLOW TRUE
# Point FetchContent at a nonexistent source subdirectory, tricking it
# into downloading the sources without adding the project to the build.
SOURCE_SUBDIR none
)
FetchContent_GetProperties(ethosu_linux_driver_src)
if(NOT ethosu_linux_driver_src_POPULATED)
FetchContent_Populate(ethosu_linux_driver_src)
endif()
FetchContent_MakeAvailable(ethosu_linux_driver_src)
set(ETHOSU_LINUX_DRIVER_SOURCE_DIR ${ethosu_linux_driver_src_SOURCE_DIR})
endif()

Expand Down
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