In some cases dmesg contains interesting errors
Do not check if the new kernel is correctly copied in memory. On ARM64 (Hetzner CAX21, CAX41) it improves boot from 4 minutes to a few seconds. Option introduced in kexec-tools here: 0481e9ed61 More on this https://eastrivervillage.com/kexec-tools-with-the-hidden-purgatory/
0481e9ed61