Messages in this thread | | | Date | Fri, 11 Apr 2014 11:03:13 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] efi: Clarify Kconfig help for EFI_MIXED |
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On 04/11/2014 10:59 AM, Thomas Bächler wrote: > EFI stub support is only missing for a 64 bit kernel on 32-bit firmware, > on 64-bit kernels, EFI stub works as usual. > --- > > Matt, I don't know if this help was intentionally discouraging, > however, out of curiosity, I tested this with ovmf, and the > kernel boots fine on 64-bit firmware bit with EFI stub, and on > 32-bit firmware using efilinux. > > Documenting this properly is important for distribution kernels. > We would want to support this on Arch, but not if it means > introducing a regression for EFI stub users. > > arch/x86/Kconfig | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 5b8ec0f..2bbbbb9 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -1529,8 +1529,8 @@ config EFI_MIXED > mode. > > Note that it is not possible to boot a mixed-mode enabled > - kernel via the EFI boot stub - a bootloader that supports > - the EFI handover protocol must be used. > + kernel via the EFI boot stub on 32-bit firmware - a bootloader > + that supports the EFI handover protocol must be used. > > If unsure, say N. >
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.
-hpa
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