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The reset and IOMMU management for remoteprocs like IRIS is implemented in the hypervisor for older targets such as X1E [1]. When booting Linux/KVM directly in EL2, this functionality is missing and the PAS interface normally used by IRIS to boot the video firmware is not working. The Venus driver supports starting the video firmware without using the PAS interface. The same code also works for X1E when using KVM. However, for the new IRIS dt-bindings it was decided to avoid using the dummy "video-firmware" node in the device tree to describe the IOMMU [2]. Discussion is still ongoing how to describe this properly [3]. To avoid regressions when running using KVM, add a TODO in x1-el2.dtso for now and disable IRIS even when it was enabled by the board. [1]: https://resources.linaro.org/en/resource/sF8jXifdb9V1mUefdbfafa [2]: https://lore.kernel.org/r/20250823155349.22344-2-krzysztof.kozlowski@linaro.org/ [3]: https://lore.kernel.org/r/20250819165447.4149674-12-mukesh.ojha@oss.qualcomm.com/ Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> Link: https://lore.kernel.org/r/20250915-x1e-iris-dt-v2-3-1f928de08fd4@linaro.org Signed-off-by: Bjorn Andersson <andersson@kernel.org> |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.