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From: "Thomas Bächler" <thomas@archlinux.org>
To: Matt Fleming <matt.fleming@intel.com>
Cc: "Thomas Gleixner" <tglx@linutronix.de>,
	"Ingo Molnar" <mingo@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org, linux-kernel@vger.kernel.org,
	"Thomas Bächler" <thomas@archlinux.org>
Subject: [PATCH] efi: Clarify Kconfig help for EFI_MIXED
Date: Fri, 11 Apr 2014 19:59:14 +0200	[thread overview]
Message-ID: <1397239154-30121-1-git-send-email-thomas@archlinux.org> (raw)

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.
 
-- 
1.9.2


             reply	other threads:[~2014-04-11 17:59 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-11 17:59 Thomas Bächler [this message]
2014-04-11 18:03 ` [PATCH] efi: Clarify Kconfig help for EFI_MIXED H. Peter Anvin
2014-04-11 18:44   ` Matt Fleming
2014-04-14  7:15     ` Ingo Molnar
2014-04-14  8:28       ` Thomas Bächler
2014-04-14  9:33         ` Matt Fleming
2014-04-14  9:47           ` Borislav Petkov

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