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docs/system/arm/xlnx-versal-virt: add a note about dumpdtb

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Add a note in the DTB section explaining how to dump the generated DTB
using the dumpdtb machine option.

Signed-off-by: Luc Michel <luc.michel@amd.com>
Reviewed-by: Francisco Iglesias <francisco.iglesias@amd.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20250926070806.292065-46-luc.michel@amd.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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Luc Michel 2025-09-26 09:08:03 +02:00 • committed by Peter Maydell
parent 0ec8c4296d
commit 39cf696fc5
1 changed files with 7 additions and 1 deletions
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8
docs/system/arm/xlnx-versal-virt.rst
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@ -65,7 +65,13 @@ When loading an OS, QEMU generates a DTB and selects an appropriate address
where it gets loaded. This DTB will be passed to the kernel in register x0.
If there's no ``-kernel`` option, we generate a DTB and place it at 0x1000
for boot-loaders or firmware to pick it up.
for boot-loaders or firmware to pick it up. To dump and observe the generated
DTB, one can use the ``dumpdtb`` machine option:
.. code-block:: bash
$ qemu-system-aarch64 -M amd-versal-virt,dumpdtb=example.dtb -m 2G
If users want to provide their own DTB, they can use the ``-dtb`` option.
These DTBs will have their memory nodes modified to match QEMU's