doc: board/qualcomm: Update RDP signing instructions

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>

diff --git a/doc/board/qualcomm/rdp.rst b/doc/board/qualcomm/rdp.rst
index fd14f1d9829dfaea4a7b503c1f60de8441f362e5..99cf8eba57ce9fc8860ba112df274515f941b46d 100644 (file)
--- a/doc/board/qualcomm/rdp.rst
+++ b/doc/board/qualcomm/rdp.rst
@@ -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