Hi, On 27.11.2021 13.55, Daniel Golle wrote: > On Sat, Nov 27, 2021 at 11:28:05AM +0200, Oskari Lemmelä wrote: >> Hi, >> >> On 25.11.2021 3.06, Daniel Golle wrote: >>> Import patchset allowing loading and applying device tree overlays at >>> run-time via configfs. >>> >>> This will allow for packaging DTOs for hardware add-ons such as the >>> various HATs (Hardware Attached on Top) common for SBCs. >>> A new kernel config option CONFIG_OF_CONFIGFS is introduced and some >>> additional sysfs attributes are added in case CONFIG_OF_OVERLAY is >>> enabled. >> >> Is this something that did not get accepted by upstream linux? >> Those patches seem to be almost 8 years old. > > I didn't investigate the full history of that patchset, I just found > it to be the default and only way available to modify DT from > user-space (and hence useful for SBC targets). >
If I remember correctly dynamic runtime DT loading was rejected by linux community. Many SBC distros used them, but when it did not make to mainline they have changed strategy. U-boot dynamic device tree loading have been implemented after that to do same thing before Linux kernel is loaded. Oskari > Quite a few trees on git.kernel.org come with that patch on top and > when looking for DT overlay documentation, the docs assume you got that > patch applied [1], [2]... > > [1]: https://elinux.org/R-Car/DT-Overlays > [2]: > https://www.96boards.org/documentation/consumer/dragonboard/dragonboard410c/guides/dt-overlays.md.html#3-load-overlays-dynamically > _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
