On Fri, 2012-09-07 at 16:56 +0800, Dave Young wrote:
> Actually in x86 setup code if bootloader do not pass correct efi_info in
> boot_params efi_enabled will be set to 0 automaticlly.
>
When we kexec a kernel, the EFI signature is missing in the bootloader
signature in boot_params, so kexec'd kernels currently disable EFI
automatically even without noefi in this code:
arch/x86/kernel/setup.c:
733 if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
734 "EL32", 4)) {
735 efi_enabled = 1;
736 efi_64bit = false;
737 } else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signatu re,
738 "EL64", 4)) {
739 efi_enabled = 1;
740 efi_64bit = true;
741 }
efi_enabled is initialized to 0.
--
Khalid Aziz <khalid.aziz at hp.com>
