On 19/06/2020 18:22, Xu Scott wrote: > Is it able to call UEFI ExitBootServices in ipxe.efi? I ask because I want to turn on UEFI Secure Boot while not want to verify the Linux kernel by firmware . I want to verify the Linux kernel by iPXE’s imgtrust. No, you can't use iPXE to bypass the Secure Boot checks on the Linux kernel image. Michael