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doc: board/qualcomm: Update RDP signing instructions

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IPQ5424 expects U-Boot to have MBN version 7 header. The qtestsign tool
presently documented doesn't support v7. Hence update the instructions
to use a different tool that can support both v6 and v7.

Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com>
Reviewed-by: Casey Connolly <casey.connolly@linaro.org>
Link: https://lore.kernel.org/r/20250304110105.2762124-4-quic_varada@quicinc.com
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>
This commit is contained in:
Varadarajan Narayanan 2025-03-04 16:31:02 +05:30 committed by Casey Connolly
parent 9997cc261a
commit c1363633c6
1 changed files with 9 additions and 6 deletions
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15
doc/board/qualcomm/rdp.rst
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@ -21,13 +21,16 @@ First, setup ``CROSS_COMPILE`` for aarch64. Then, build U-Boot for ``IPQ9574``::
This will build ``u-boot.elf`` in the configured output directory.
Although the RDPs do not have secure boot set up by default, the firmware still
expects firmware ELF images to be "signed". The signature does not provide any
security in this case, but it provides the firmware with some required metadata.
The firmware expects the ELF images to be in MBN format. The `elftombn.py` tool
can be used to convert the ELF images to MBN format.
To "sign" ``u-boot.elf`` you can use e.g. `qtestsign`_::
IPQ9574: (MBN version 6)
$ qtestsign -v6 aboot -o u-boot.mbn u-boot.elf
$ python elftombn.py -f u-boot.elf -o u-boot.mbn -v6
IPQ5424: (MBN version 7)
$ python elftombn.py -f u-boot.elf -o u-boot.mbn -v7
Then install the resulting ``u-boot.mbn`` to the ``0:APPSBL`` partition
on your device with::
@ -51,5 +54,5 @@ U-Boot should be running after a reboot (``reset``).
Note that the support added is very basic. Restoring the original U-Boot
on boards with older version of the software requires a debugger.
.. _qtestsign: https://github.com/msm8916-mainline/qtestsign
.. _elftombn.py: https://git.codelinaro.org/clo/qsdk/oss/system/tools/meta/-/tree/NHSS.QSDK.13.0.5.r2/scripts?ref_type=heads
.. _edl: https://github.com/bkerler/edl