* [PATCH] um: Document dtb command line option
[not found] <1118129237.194759.1640202076897.JavaMail.zimbra@nod.at>
@ 2022-01-04 10:44 ` anton.ivanov
2022-01-13 15:09 ` Vincent Whitchurch
0 siblings, 1 reply; 2+ messages in thread
From: anton.ivanov @ 2022-01-04 10:44 UTC (permalink / raw)
To: linux-um
Cc: linux-kernel, devicetree, kernel, robh+dt, jdike, johannes,
vincent.whitchurch, richard, linux-doc, Anton Ivanov
From: Anton Ivanov <anton.ivanov@cambridgegreys.com>
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>
---
.../virt/uml/user_mode_linux_howto_v2.rst | 20 +++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/Documentation/virt/uml/user_mode_linux_howto_v2.rst b/Documentation/virt/uml/user_mode_linux_howto_v2.rst
index 2cafd3c3c6cb..81986fe014d4 100644
--- a/Documentation/virt/uml/user_mode_linux_howto_v2.rst
+++ b/Documentation/virt/uml/user_mode_linux_howto_v2.rst
@@ -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
-----------------------
--
2.30.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] um: Document dtb command line option
2022-01-04 10:44 ` [PATCH] um: Document dtb command line option anton.ivanov
@ 2022-01-13 15:09 ` Vincent Whitchurch
0 siblings, 0 replies; 2+ messages in thread
From: Vincent Whitchurch @ 2022-01-13 15:09 UTC (permalink / raw)
To: anton.ivanov
Cc: linux-um, linux-kernel, devicetree, kernel, robh+dt, jdike,
johannes, richard, linux-doc
On Tue, Jan 04, 2022 at 11:44:57AM +0100, anton.ivanov@cambridgegreys.com wrote:
> From: Anton Ivanov <anton.ivanov@cambridgegreys.com>
>
> 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>
LGTM, thanks.
Reviewed-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
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