In my company we use openwrt as our base os for embeded devices. And we use the librt as our core timer schedule, but we found that the timer is not stable, which will have 20ms delay after 10 mins running and then back to normal. but this will cause our device conflicts.
So we try to import the linux-rt, and now it works fine without timer delay.
Now we add our patches to openwrt master branch, and has been tested building allwinner and rockchip arm64 series boards.
This is the branch https://github.com/pengphei/openwrt/tree/master-rt .
Any one interested, please help.