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Subject[PATCH 5/5] x86_64 EFI support -v3: EFI document
This patch adds document for EFI x86_64 support. The boot parameters
added are documented in Documentation/i386/zero-page.txt. The setup
and operation guide of EFI based system is documented in

Signed-off-by: Chandramouli Narayanan <>
Signed-off-by: Huang Ying <>


i386/zero-page.txt | 18 ++++++++++++++----
x86_64/uefi.txt | 42 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+), 4 deletions(-)

Index: linux-2.6.23-rc1/Documentation/i386/zero-page.txt
--- linux-2.6.23-rc1.orig/Documentation/i386/zero-page.txt 2007-07-30 11:28:45.000000000 +0800
+++ linux-2.6.23-rc1/Documentation/i386/zero-page.txt 2007-07-30 11:29:28.000000000 +0800
@@ -31,11 +31,11 @@
0xb0 - 0x13f Free. Add more parameters here if you really need them.
0x140- 0x1be EDID_INFO Video mode setup

-0x1c4 unsigned long EFI system table pointer
-0x1c8 unsigned long EFI memory descriptor size
-0x1cc unsigned long EFI memory descriptor version
+0x1c4 unsigned long EFI system table pointer*
+0x1c8 unsigned long EFI memory descriptor size*
+0x1cc unsigned long EFI memory descriptor version*
0x1d0 unsigned long EFI memory descriptor map pointer
-0x1d4 unsigned long EFI memory descriptor map size
+0x1d4 unsigned long EFI memory descriptor map size*
0x1e0 unsigned long ALT_MEM_K, alternative mem check, in Kb
0x1e4 unsigned long Scratch field for the kernel setup code
0x1e8 char number of entries in E820MAP (below)
@@ -87,3 +87,13 @@
0x2d0 - 0xd00 E820MAP
0xd00 - 0xeff EDDBUF (edd.S) for disk signature read sector
0xd00 - 0xeeb EDDBUF (edd.S) for edd data
+Changes for x86_64 implementation:
+For alignment purposes, the following parameters are rearranged.
+0x1b8 unsigned long EFI system table pointer
+0x1c0 unsigned long EFI Loader signature
+0x1c4 unsigned long EFI memory descriptor size
+0x1c8 unsigned long EFI memory descriptor version
+0x1cc unsigned long EFI memory descriptor map size
Index: linux-2.6.23-rc1/Documentation/x86_64/uefi.txt
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.23-rc1/Documentation/x86_64/uefi.txt 2007-07-30 11:29:28.000000000 +0800
@@ -0,0 +1,42 @@
+General note on [U]EFI x86_64 support
+This provides documentation on [U]EFI support for x86_64 architecture.
+The nomenclature EFI and UEFI are used intechangeably in this document.
+Although the tools below are _not_ needed for building the kernel,
+the needed bootloader support and associated tools for x86_64 platforms
+with EFI firmware and specifications are listed below.
+1. UEFI specification:
+2. Booting EFI64 enabled kernel requires boot loader support.
+Patches to elilo and gnu-efi library with x86_64 support and documentation
+have been submitted to respective project maintainers.
+ elilo:
+ gnu-efi library:
+ gnu-efi-3.0d release now supports [U]EFI x86_64.
+3. The tool to convert ELF to PE-COFF image:
+ binutils- supports Intel64 EFI.
+ see
+ [ elilo/gnu-efi with x86_64 support need this binutils support ]
+4. x86_64 platform with EFI/UEFI firmware.
+- Apply the EFI64 kernel patches and build with the following configuration.
+ EFI_FB=y
+- Create a VFAT partition on the disk
+- Copy the following to the VFAT partition:
+ elilo bootloader with x86_64 support and elilo configuration file
+ efi64 kernel image and initrd. Instructions on building elilo
+ and its dependencies can be found in the elilo sourceforge project.
+- Boot to EFI shell and invoke elilo choosing efi64 kernel image
+- On UEFI2.0 firmware systems, pass vga=normal for boot messages to show up
+ console. You can pass along the 'resume' boot option to test suspend/resume.
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