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um: Document dtb command line option

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Add documentation for the dtb command line option and the
ability to load/parse device trees.

Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Reviewed-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
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Anton Ivanov 2022-01-04 10:44:57 +00:00 committed by Richard Weinberger
parent 2a6852cb8f
commit 6427c16527
1 changed files with 20 additions and 0 deletions
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Documentation/virt/uml/user_mode_linux_howto_v2.rst
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@ -1189,6 +1189,26 @@ E.g. ``os_close_file()`` is just a wrapper around ``close()``
which ensures that the userspace function close does not clash
with similarly named function(s) in the kernel part.
Using UML as a Test Platform
============================
UML is an excellent test platform for device driver development. As
with most things UML, "some user assembly may be required". It is
up to the user to build their emulation environment. UML at present
provides only the kernel infrastructure.
Part of this infrastructure is the ability to load and parse fdt
device tree blobs as used in Arm or Open Firmware platforms. These
are supplied as an optional extra argument to the kernel command
line::
dtb=filename
The device tree is loaded and parsed at boottime and is accessible by
drivers which query it. At this moment in time this facility is
intended solely for development purposes. UML's own devices do not
query the device tree.
Security Considerations
-----------------------