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While installing a rpm to update kernel on a deployed target, it will update the boot area and the boot menu with the kernel as the priority but allow you to fall back to the original kernel as well. - In kernel-image's preinstall scriptlet, it backs up original kernel to avoid probable confliction with the new one. - In kernel-image's postinstall scriptlet, it modify grub's config file to updates the new kernel as the boot priority. [YOCTO #4104] (From OE-Core rev: 8d872e7712a62fa4313a1114a92907c29beffa2e) Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com> Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>