UefiCpuPkg VTF0: Add README, remove Makefile

* Add README
* Remove Makefile which is no longer used to build VTF0

Signed-off-by: jljusten
Reviewed-by: geekboy15a

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12355 6f19259b-4bc3-4df7-8a09-765794883524

UefiCpuPkg/ResetVector/Vtf0/Makefile

@@ -1,42 +0,0 @@
-## @file
-#  Makefile to create FFS Raw sections for VTF images.
-#
-#  Copyright (c) 2008 - 2010, Intel Corporation. All rights reserved.<BR>
-#
-#  This program and the accompanying materials
-#  are licensed and made available under the terms and conditions of the BSD License
-#  which accompanies this distribution.  The full text of the license may be found at
-#  http://opensource.org/licenses/bsd-license.php
-#
-#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-#
-
-TARGETS = Bin/ResetVector.ia32.raw Bin/ResetVector.x64.raw
-ASM = nasm
-
-COMMON_DEPS = \
-  Ia16/Real16ToFlat32.asm \
-  Ia32/Flat32ToFlat64.asm \
-  JumpToSec.asm \
-  Ia16/ResetVectorVtf0.asm \
-  Ia32/SearchForBfvBase.asm \
-  Ia32/SearchForSecAndPeiEntries.asm \
-  SerialDebug.asm \
-  Makefile \
-  Tools/FixupForRawSection.py
-
-.PHONY: all
-all: $(TARGETS)
-
-Bin/ResetVector.ia32.raw: $(COMMON_DEPS) ResetVectorCode.asm
-	nasm -D ARCH_IA32 -o $@ ResetVectorCode.asm
-	python Tools/FixupForRawSection.py $@
-
-Bin/ResetVector.x64.raw: $(COMMON_DEPS) ResetVectorCode.asm
-	nasm -D ARCH_X64 -o $@ ResetVectorCode.asm
-	python Tools/FixupForRawSection.py $@
-
-clean:
-	-rm $(TARGETS)
-

UefiCpuPkg/ResetVector/Vtf0/README

@@ -0,0 +1,41 @@
+
+=== HOW TO USE VTF0 ===
+
+Add this line to your FDF FV section:
+INF  RuleOverride=RESET_VECTOR USE = IA32 UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.inf
+(For X64 SEC/PEI change IA32 to X64 => 'USE = X64')
+
+In your FDF FFS file rules sections add:
+[Rule.Common.SEC.RESET_VECTOR]
+  FILE RAW = $(NAMED_GUID) {
+    RAW RAW                |.raw
+  }
+
+=== VTF0 Boot Flow ===
+
+1. Transition to IA32 flat mode
+2. Locate BFV (Boot Firmware Volume) by checking every 4kb boundary
+3. Locate SEC image
+4. X64 VTF0 transitions to X64 mode
+5. Call SEC image entry point
+
+== VTF0 SEC input parameters ==
+
+All inputs to SEC image are register based:
+EAX/RAX - Initial value of the EAX register (BIST: Built-in Self Test)
+DI      - 'BP': boot-strap processor, or 'AP': application processor
+EBP/RBP - Pointer to the start of the Boot Firmware Volume
+
+=== HOW TO BUILD VTF0 ===
+
+Dependencies:
+* Python 2.5~2.7
+* Nasm with x86-64 support
+
+To rebuild the VTF0 binaries:
+1. Change to VTF0 source dir: UefiCpuPkg/ResetVector/Vtf0
+2. nasm and python should be in executable path
+3. Run this command:
+   python Build.py
+4. Binaries output will be in UefiCpuPkg/ResetVector/Vtf0/Bin
+