Am 14.04.2014 09:15, schrieb Ingo Molnar: >>> Right, it is really that it is not possible to boot a mixed-mode kernel >>> on its non-native firmware using the stub, since the stub itself can >>> only be one way or the other. >> >> Yeah, my help text was a bit... unhelpful. >> >> CONFIG_EFI_MIXED does not introduce a regression of any sort, you can >> enable it without worrying about that. >> >> All the boot configurations that used to work will continue to work. >> >> What I meant to say was that it isn't possible to use the EFI mixed >> *feature* (booting a 64-bit kernel with 32-bit firmware) with the >> EFI boot stub - so you can build support into your kernel but >> there's no way to make the CPU actually execute those code paths. > > Same goes for booting a 32-bit kernel on 64-bit firmware, right? >
It seems that isn't implemented:
config EFI_MIXED
bool "EFI mixed-mode support"
depends on EFI_STUB && X86_64
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