97 lines
4.1 KiB
ReStructuredText
97 lines
4.1 KiB
ReStructuredText
.. _west-sign:
|
|
|
|
Signing Binaries
|
|
################
|
|
|
|
The ``west sign`` :ref:`extension <west-extensions>` command can be used to
|
|
sign a Zephyr application binary for consumption by a bootloader using an
|
|
external tool. Run ``west sign -h`` for command line help.
|
|
|
|
MCUboot / imgtool
|
|
*****************
|
|
|
|
The Zephyr build system has special support for signing binaries for use with
|
|
the `MCUboot`_ bootloader using the `imgtool`_ program provided by its
|
|
developers. You can both build and sign this type of application binary in one
|
|
step by setting some Kconfig options. If you do, ``west flash`` will use the
|
|
signed binaries.
|
|
|
|
If you use this feature, you don't need to run ``west sign`` yourself; the
|
|
build system will do it for you.
|
|
|
|
Here is an example workflow, which builds and flashes MCUboot, as well as the
|
|
:ref:`hello_world` application for chain-loading by MCUboot. Run these commands
|
|
from the :file:`zephyrproject` workspace you created in the
|
|
:ref:`getting_started`.
|
|
|
|
.. code-block:: console
|
|
|
|
west build -b YOUR_BOARD bootloader/mcuboot/boot/zephyr -d build-mcuboot
|
|
west build -b YOUR_BOARD zephyr/samples/hello_world -d build-hello-signed -- \
|
|
-DCONFIG_BOOTLOADER_MCUBOOT=y \
|
|
-DCONFIG_MCUBOOT_SIGNATURE_KEY_FILE=\"bootloader/mcuboot/root-rsa-2048.pem\"
|
|
|
|
west flash -d build-mcuboot
|
|
west flash -d build-hello-signed
|
|
|
|
Notes on the above commands:
|
|
|
|
- ``YOUR_BOARD`` should be changed to match your board
|
|
- The ``CONFIG_MCUBOOT_SIGNATURE_KEY_FILE`` value is the insecure default
|
|
provided and used by by MCUboot for development and testing
|
|
- You can change the ``hello_world`` application directory to any other
|
|
application that can be loaded by MCUboot, such as the :ref:`smp_svr_sample`
|
|
|
|
For more information on these and other related configuration options, see:
|
|
|
|
- :kconfig:option:`CONFIG_BOOTLOADER_MCUBOOT`: build the application for loading by
|
|
MCUboot
|
|
- :kconfig:option:`CONFIG_MCUBOOT_SIGNATURE_KEY_FILE`: the key file to use with ``west
|
|
sign``. If you have your own key, change this appropriately
|
|
- :kconfig:option:`CONFIG_MCUBOOT_EXTRA_IMGTOOL_ARGS`: optional additional command line
|
|
arguments for ``imgtool``
|
|
- :kconfig:option:`CONFIG_MCUBOOT_GENERATE_CONFIRMED_IMAGE`: also generate a confirmed
|
|
image, which may be more useful for flashing in production environments than
|
|
the OTA-able default image
|
|
- On Windows, if you get "Access denied" issues, the recommended fix is
|
|
to run ``pip3 install imgtool``, then retry with a pristine build directory.
|
|
|
|
If your ``west flash`` :ref:`runner <west-runner>` uses an image format
|
|
supported by imgtool, you should see something like this on your device's
|
|
serial console when you run ``west flash -d build-mcuboot``:
|
|
|
|
.. code-block:: none
|
|
|
|
*** Booting Zephyr OS build zephyr-v2.3.0-2310-gcebac69c8ae1 ***
|
|
[00:00:00.004,669] <inf> mcuboot: Starting bootloader
|
|
[00:00:00.011,169] <inf> mcuboot: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
|
|
[00:00:00.021,636] <inf> mcuboot: Boot source: none
|
|
[00:00:00.027,313] <wrn> mcuboot: Failed reading image headers; Image=0
|
|
[00:00:00.035,064] <err> mcuboot: Unable to find bootable image
|
|
|
|
Then, you should see something like this when you run ``west flash -d
|
|
build-hello-signed``:
|
|
|
|
.. code-block:: none
|
|
|
|
*** Booting Zephyr OS build zephyr-v2.3.0-2310-gcebac69c8ae1 ***
|
|
[00:00:00.004,669] <inf> mcuboot: Starting bootloader
|
|
[00:00:00.011,169] <inf> mcuboot: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
|
|
[00:00:00.021,636] <inf> mcuboot: Boot source: none
|
|
[00:00:00.027,374] <inf> mcuboot: Swap type: none
|
|
[00:00:00.115,142] <inf> mcuboot: Bootloader chainload address offset: 0xc000
|
|
[00:00:00.123,168] <inf> mcuboot: Jumping to the first image slot
|
|
*** Booting Zephyr OS build zephyr-v2.3.0-2310-gcebac69c8ae1 ***
|
|
Hello World! nrf52840dk_nrf52840
|
|
|
|
Whether ``west flash`` supports this feature depends on your runner. The
|
|
``nrfjprog`` and ``pyocd`` runners work with the above flow. If your runner
|
|
does not support this flow and you would like it to, please send a patch or
|
|
file an issue for adding support.
|
|
|
|
.. _MCUboot:
|
|
https://mcuboot.com/
|
|
|
|
.. _imgtool:
|
|
https://pypi.org/project/imgtool/
|