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soc/mediatek/adsp: Build zephyr.ri using rimage when available

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This is mostly a cut/paste copy of similar code in intel_adsp and imx,
which sadly can't be shared given the way the design works.  Also
includes a bonus, slightly-passive-aggressive description of why that
is.

Signed-off-by: Andy Ross <andyross@google.com>
This commit is contained in:
Andy Ross 2024-11-18 17:01:18 -08:00 • committed by Benjamin Cabé
commit 00417b36bc
1 changed files with 30 additions and 0 deletions
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30
soc/mediatek/mt8xxx/CMakeLists.txt
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@ -12,3 +12,33 @@ add_custom_target(dsp_img ALL
COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/gen_img.py
${ZEPHYR_BINARY_DIR}/${KERNEL_ELF_NAME}
${CMAKE_BINARY_DIR}/zephyr/zephyr.img)
# Sign zephyr.ri using west (if the underlying rimage tool is
# available; generally it isn't except in SOF builds). Note that the
# "target" string to use for rimage is set at the board level as a
# RIMAGE_TARGET cached (cached so that the python script can read it!)
# cmake variable (not kconfig!). See board_set_rimage_target().
# Thankfully the SOC name and the rimage target names for these
# platforms are identical. The west sign integration similarly needs
# a RIMAGE_CONFIG_PATH cmake cached (!) variable set to a directory
# containing the .toml files for the platforms, which SOF will set on
# its own at build time. And likewise the signing key isn't provided
# by Zephyr and needs tob e found by a SOF build by passing it in
# RIMAGE_SIGN_KEY.
#
# The short version is that zephyr.ri can only realistically be
# exercised from a SOF build and it doesn't belong here in Zephyr;
# rimage is a SOF tool. Signing audio firmware is only done for SOF
# firmware and not general Zephyr apps for the same hardware. This
# should live in SOF where it doesn't have to be duplicated for every
# device and where it won't be forced to communicate via side channels.
board_set_rimage_target(${CONFIG_SOC})
set(RIMAGE_SIGN_KEY "otc_private_key_3k.pem" CACHE STRING "default rimage key")
add_custom_target(zephyr.ri ALL DEPENDS ${CMAKE_BINARY_DIR}/zephyr/zephyr.ri)
add_custom_command(
OUTPUT ${CMAKE_BINARY_DIR}/zephyr/zephyr.ri
COMMENT "Sign with rimage..."
COMMAND west $<$<BOOL:${CMAKE_VERBOSE_MAKEFILE}>:--verbose> sign
--if-tool-available --tool rimage --build-dir ${CMAKE_BINARY_DIR}
DEPENDS ${CMAKE_BINARY_DIR}/zephyr/${KERNEL_ELF_NAME}
)