linux-kernel - [PATCH 3/3 -v4] x86_64 EFI runtime service support: document for EFI runtime services

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Message-Id: <1193295493.23935.204.camel@caritas-dev.intel.com>
Date:	Thu, 25 Oct 2007 14:58:13 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	akpm@...ux-foundation.org, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Andi Kleen <ak@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Chandramouli Narayanan <mouli@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 3/3 -v4] x86_64 EFI runtime service support: document for
	EFI runtime services

This patch adds document for EFI x86_64 runtime services support.

---

 boot-options.txt |   12 +++++++++++-
 uefi.txt         |   10 ++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

Signed-off-by: Chandramouli Narayanan <mouli@...ux.intel.com>
Signed-off-by: Huang Ying <ying.huang@...el.com>

Index: linux-2.6.24-rc1/Documentation/x86_64/boot-options.txt
===================================================================
--- linux-2.6.24-rc1.orig/Documentation/x86_64/boot-options.txt	2007-10-25 13:58:14.000000000 +0800
+++ linux-2.6.24-rc1/Documentation/x86_64/boot-options.txt	2007-10-25 13:58:18.000000000 +0800
@@ -110,12 +110,15 @@
 
 Rebooting
 
-   reboot=b[ios] | t[riple] | k[bd] [, [w]arm | [c]old]
+   reboot=b[ios] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old]
    bios	  Use the CPU reboot vector for warm reset
    warm   Don't set the cold reboot flag
    cold   Set the cold reboot flag
    triple Force a triple fault (init)
    kbd    Use the keyboard controller. cold reset (default)
+   efi    Use efi reset_system runtime service. If EFI is not configured or the
+          EFI reset does not work, the reboot path attempts the reset using
+          the keyboard controller.
 
    Using warm reset will be much faster especially on big memory
    systems because the BIOS will not go through the memory check.
@@ -300,4 +303,11 @@
 		newfallback: use new unwinder but fall back to old if it gets
 			stuck (default)
 
+EFI
+
+  noefi		Disable EFI support
+
+  noefi_time	Disable EFI time runtime service, programming CMOS
+  		hardware directly
+
 Miscellaneous
Index: linux-2.6.24-rc1/Documentation/x86_64/uefi.txt
===================================================================
--- linux-2.6.24-rc1.orig/Documentation/x86_64/uefi.txt	2007-10-25 13:58:18.000000000 +0800
+++ linux-2.6.24-rc1/Documentation/x86_64/uefi.txt	2007-10-25 13:58:18.000000000 +0800
@@ -19,6 +19,10 @@
 - Build the kernel with the following configuration.
 	CONFIG_FB_EFI=y
 	CONFIG_FRAMEBUFFER_CONSOLE=y
+  If EFI runtime services are expected, the following configuration should
+  be selected.
+	CONFIG_EFI=y
+	CONFIG_EFI_VARS=y or m		# optional
 - Create a VFAT partition on the disk
 - Copy the following to the VFAT partition:
 	elilo bootloader with x86_64 support, elilo configuration file,
@@ -27,3 +31,9 @@
 	can be found in the elilo sourceforge project.
 - Boot to EFI shell and invoke elilo choosing the kernel image built
   in first step.
+- If some or all EFI runtime services don't work, you can try following
+  kernel command line parameters to turn off some or all EFI runtime
+  services.
+	noefi		turn off all EFI runtime services
+	noefi_time	turn off EFI time runtime service
+	reboot_type=k	turn off EFI reboot runtime service
-
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