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Date: Fri, 11 Apr 2014 11:03:13 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Thomas Bächler <thomas@...hlinux.org>, Matt Fleming <matt.fleming@...el.com> CC: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, x86@...nel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] efi: Clarify Kconfig help for EFI_MIXED 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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