linux-kernel - [PATCH] efi: Clarify Kconfig help for EFI

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Message-Id: <1397239154-30121-1-git-send-email-thomas@archlinux.org>
Date:	Fri, 11 Apr 2014 19:59:14 +0200
From:	Thomas Bächler <thomas@...hlinux.org>
To:	Matt Fleming <matt.fleming@...el.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Thomas Bächler <thomas@...hlinux.org>
Subject: [PATCH] efi: Clarify Kconfig help for EFI_MIXED

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

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