On Mon, 15 Oct 2018 17:27:01 -0700, frowand.list@xxxxxxxxx said: > From: Frank Rowand <frank.rowand@xxxxxxxx> > > When an overlay is applied or removed, the live devicetree visible in > /proc/device-tree/, aka /sys/firmware/devicetree/base/, reflects the > changes. There is no method for user space to determine whether the > live devicetree was modified by overlay actions. > > Provide a sysfs file, /sys/firmware/devicetree/tree_version, to allow > user space to determine if the live devicetree has remained unchanged > while a series of one or more accesses of /proc/device-tree/ occur. > > The use of both dynamic devicetree modifications and overlay apply and > removal are not supported during the same boot cycle. Thus non-overlay > dynamic modifications are not reflected in the value of tree_version. Is there an easy way from userspace to detect "yes/no dynamic modifications have been done since boot"?
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