Root Build Factory is awesome for creating images and we can certainly create new images when we get new kernels .. but we need a way to make that (kernel upgrades) happen in a automated way as well.
I know that some images use unique kernels, but we need a way to update the ones that use the distro kernel.
There is a yum and dnf plugin to handle kernel updates. It calls a bash script rbf(boardname).sh after install/upgrade of the package kernel-core. Refer [1] The script is called with 3 arguments: distro name, kernel version and root path. Refer [2] Presently there is only one kind of script. The one that appends an entry to /boot/extlinux/extlinux.conf. As and when we find new boards which can use the distro kernel, we can add kernel upgrade scripts. Such kernel upgrade scripts will probably have to use U-Boot's mkimage utility.
[1] https://github.com/mndar/rbf/tree/master/yumplugins [2] https://github.com/mndar/rbf/blob/master/doc/KERNELUP_README.md [3] https://github.com/mndar/rbf/blob/master/README.md