On Fri, Mar 17, 2023 at 01:19:37PM +0100, Johannes Zink wrote: > Barebox automatically fixes up several properties to the root and > chosen node of the device tree passed to the booted system. > > These entries contain information about the hardware, reset source > and the barebox version string. > > Add documentation on how to query these information from the booted > linux system. > > Signed-off-by: Johannes Zink <j.zink@xxxxxxxxxxxxxx> > --- > Changelog: > > v1 -> v2: Correct errors in content spotted by Ahmad. While at it, fix some typos. > > Documentation/devicetree/index.rst | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) Applied, thanks Sascha > > diff --git a/Documentation/devicetree/index.rst b/Documentation/devicetree/index.rst > index 36fa69058d1d..f85ce6608d14 100644 > --- a/Documentation/devicetree/index.rst > +++ b/Documentation/devicetree/index.rst > @@ -151,3 +151,25 @@ Contents: > bindings/regulator/* > bindings/rtc/* > bindings/watchdog/* > + > +Automatic Boot Argument Fixups to the Devicetree > +------------------------------------------------ > + > +barebox automatically fixes up some boot and system information in the device tree. > + > +In the device tree root, barebox fixes up > + > + * serial-number (if available) > + * machine compatible (if overridden) > + > +In the ``chosen``-node, barebox fixes up > + > + * barebox-version > + * reset-source > + * reset-source-instance (if available) > + * reset-source-device (node-path, only if available) > + * bootsource > + * boot-hartid (only on RISC-V) > + > +These values can be read from the booted linux system in ``/proc/device-tree/`` > +or ``/sys/firmware/devicetree/base``. > -- > 2.30.2 > > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
