Messages in this thread Patch in this message | | | From | Pantelis Antoniou <> | Subject | [PATCH v5 4/4] Documentation: ABI: /sys/firmware/devicetree/overlays | Date | Wed, 16 Sep 2015 19:09:11 +0300 |
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Documentation ABI entry for overlays sysfs entries.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com> --- .../ABI/testing/sysfs-firmware-devicetree-overlays | 35 ++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
diff --git a/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays new file mode 100644 index 0000000..2166051 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays @@ -0,0 +1,35 @@ +What: /sys/firmware/devicetree/overlays/ +Date: March 2015 +Contact: Pantelis Antoniou <pantelis.antoniou@konsulko.com> +Description: + This directory contains the applied device tree overlays of + the running system, as directories of the overlay id. + + enable: The master enable switch, by default is 1, and when + set to 0 it cannot be re-enabled for security reasons. + + The discussion about this switch takes place in: + http://comments.gmane.org/gmane.linux.drivers.devicetree/101871 + + Kees Cook: + "Coming from the perspective of drawing a bright line between + kernel and the root user (which tends to start with disabling + kernel module loading), I would say that there at least needs + to be a high-level one-way "off" switch for the interface so + that systems that have this interface can choose to turn it off + during initial boot, etc." + +What: /sys/firmware/devicetree/overlays/<id> +Date: March 2015 +Contact: Pantelis Antoniou <pantelis.antoniou@konsulko.com> +Description: + Each directory represents an applied overlay, containing + the following attribute files. + + targets: A file containing the list of targets of each overlay + with each line containing a target. + + can_remove: The attribute set to 1 means that the overlay can + be removed, while 0 means that the overlay is being + overlapped therefore removal is prohibited. + -- 1.7.12
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