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authorStefan Reinauer <stepan@openbios.org>2003-11-22 15:15:47 +0000
committerStefan Reinauer <stepan@openbios.org>2003-11-22 15:15:47 +0000
commit37414ca2c6e59649f8eee4da4a37b5ae57617dcf (patch)
tree7f912dfe8cb9321c341c093f337d8d69ebd051a5 /documentation
parentdcac0161d443c6846092afedd58bb84e84e458ad (diff)
downloadcoreboot-37414ca2c6e59649f8eee4da4a37b5ae57617dcf.tar.xz
initial version of LinuxBIOS on AMD64 paper
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+%
+% This document is released under the GPL
+% Initially written by Stefan Reinauer, <stepan@openbios.org>
+%
+
+\documentclass[titlepage,12pt]{article}
+\usepackage{a4}
+\usepackage{graphicx}
+\usepackage{url}
+\usepackage[pdftex]{hyperref}
+% \usepackage{makeidx}
+% \makeindex
+
+\hypersetup{
+ urlbordercolor={1 1 1},
+ menubordercolor={1 1 1},
+ linkbordercolor={1 1 1},
+ colorlinks=false,
+ % pdfpagemode=None, % PDF-Viewer starts without TOC
+ % pdfstartview=FitH,
+ pdftitle={LinuxBIOS on AMD64},
+ pdfauthor={Stefan Reinauer},
+ pdfsubject={LinuxBIOS configuration and build process},
+ pdfkeywords={LinuxBIOS, Opteron, AMD64, Athlon64, Build}
+}
+
+
+% \newcommand{\sh}[1]{\begin{verbatim}\texttt{#1}\end{verbatim}}
+% \newcommand{\prog}[1]{\textit{#1}}
+
+\setlength{\parindent}{0pt}
+
+\title{LinuxBIOS on AMD64}
+\author{Stefan Reinauer $<$stepan@openbios.org$>$}
+\date{November 18, 2003}
+
+\begin{document}
+
+\maketitle
+
+\thispagestyle{empty}
+
+\tableofcontents
+
+\newpage
+
+%
+% 1 Abstract
+%
+
+\section{Abstract}
+
+This document targets porting LinuxBIOS to new Motherboards and creating
+custom firmware images using LinuxBIOS. It describes how to build
+LinuxBIOS images for the AMD64 platform, including hypertransport
+configuration and pertinent utilities. If you are missing information or
+find errors in the following descriptions, contact
+\href{mailto:stepan@openbios.org}{\textit{Stefan Reinauer $<$stepan@openbios.org$>$}}
+
+
+%
+% 2 What is LinuxBIOS
+%
+
+\section{What is LinuxBIOS?}
+
+LinuxBIOS aims to replace the normal BIOS found on PCs, Alphas, and
+other machines with a Linux kernel that can boot Linux from a cold
+start. The startup code of an average LinuxBIOS port is about 500 lines
+of assembly and 5000 lines of C. It executes 16 instructions to get into
+32bit mode and then performs DRAM and other hardware initializations
+required before Linux can take over.
+
+The projects primary motivation initially was maintenance of large
+clusters. Not surprisingly interest and contributions have come from
+people with varying backgrounds. Nowadays a large and growing number of
+Systems can be booted with LinuxBIOS, including embedded systems,
+Desktop PCs and Servers.
+
+%
+% 3 Build Requirements
+%
+
+\section{Build Requirements}
+To build LinuxBIOS for AMD64 from the sources you need a recent Linux
+system for x86 or AMD64. SUSE Linux 8.2 or 9.0 are known to work fine.
+The following toolchain is recommended:
+
+ \begin{itemize}
+ \item GCC 3.3.1
+ \item binutils 2.14.90.0.5
+ \item Python 2.3
+ \item CVS 1.11.6
+ \end{itemize}
+
+\textbf{NOTE:} Later versions should also work. Prior versions might lead to problems.
+
+\newpage
+
+%
+% 4 Getting the Sources
+%
+
+\section{Getting the Sources}
+
+The latest LinuxBIOS sources are available via CVS. The CVS repository
+is maintained at SourceForge.net (the project name is \emph{FreeBIOS}). You
+can get the entire source tree via CVS:
+
+{ \small
+\begin{verbatim}
+% cvs -d:pserver:anonymous@cvs.freebios.sourceforge.net:/cvsroot/freebios login
+\end{verbatim}
+}
+
+Hit return when you are asked for a password. Then checkout (or update)
+the freebios source tree as follows:
+
+{ \small
+\begin{verbatim}
+% cvs -z3 -d:pserver:anonymous@cvs.freebios.sourceforge.net:/cvsroot/freebios co freebios2
+\end{verbatim}
+}
+
+Once the source tree is checked out, it can be updated with:
+
+{ \small
+\begin{verbatim}
+% cvs update ­Pd
+\end{verbatim}
+}
+
+Due to recent problems with SourceForge's CVS infrastructure we set up a
+snapshot site that keeps hourly source trees of the last four days. It
+is available at \url{http://snapshots.linuxbios.org/}.
+Due to major structural enhancements to \hbox{LinuxBIOS}, AMD64 support
+is only available in the \texttt{freebios2} tree. This tree reflects (as
+of November 2003) LinuxBIOS version 1.1.5 and will lead to LinuxBIOS 2.0
+when finished. Most x86 hardware is currently only supported by the
+LinuxBIOS 1.0 tree.
+
+%
+% 5 LinuxBIOS configuration overview
+%
+
+\section{LinuxBIOS configuration overview}
+To support a large variety of existing hardware LinuxBIOS allows for a
+lot of configuration options that can be tweaked in several ways:
+
+\begin{itemize}
+\item
+Firmware image specific configuration options can be set in the image
+configuration file which is usually found in
+\texttt{freebios2/targets/$<$vendor$>$/$<$motherboard$>$/}. Such
+options are the default amount of output verbosity during bootup, image
+size, use of fallback mechanisms, firmware image size and payloads
+(Linux Kernel, Bootloader...) The default configuration file name is
+\texttt{Config.lb}, but LinuxBIOS allows multiple configurations to
+reside in that directory.
+
+\item Motherboard specific configuration options can be set in the
+motherboard configuration file placed in
+\texttt{freebios2/src/mainboard/$<$vendor$>$/$<$motherboard$>$}. The
+motherboard configuration file is always called \texttt{Config.lb}. It
+contains information on the onboard components of the motherboard like
+CPU type, northbridge, southbridge, hypertransport configuration and
+SuperIO configuration. This configuration file also allows to include
+addon code to hook into the LinuxBIOS initialization mechanism at
+basically any point.
+
+\end{itemize}
+
+This document describes different approaches of changing and configuring the
+LinuxBIOS source tree when building for AMD64.
+
+\section{Building LinuxBIOS}
+One of the design goals for building LinuxBIOS was to keep object files
+out of the source tree in a seperate place. This is mandatory for
+building parallel LinuxBIOS images for several distinct motherboards
+and/or platforms. Therefore building LinuxBIOS consists of two steps:
+\begin{itemize}
+\item
+creating a build tree which holds all files automatically created by the
+configuration utility and the object files
+\item
+compiling the LinuxBIOS code and creating a flashable firmware image.
+\end{itemize}
+
+The first of these two steps is accomplished by the \texttt{buildtarget}
+script found in \texttt{freebios2/targets/}. To build LinuxBIOS for
+instance for the AMD Solo Athlon64 motherboard enter:
+
+\begin{verbatim}
+% cd freebios2/targets
+% ./buildtarget amd/solo
+\end{verbatim}
+
+This will create a directory containing a Makefile and other software
+components needed for this build. The directory name is defined in the
+firmware image specific configuration file. In the case of AMD's Solo
+motherboard the default directory resides in
+\texttt{freebios2/targets/amd/solo/solo}. To build the LinuxBIOS image, do
+
+\begin{verbatim}
+% cd amd/solo/solo
+% make
+\end{verbatim}
+
+The LinuxBIOS image filename is specified in the firmware image specific
+configuration file. The default filename for AMD's Solo motherboard is
+\texttt{solo.rom}.
+
+\section{Programming LinuxBIOS to flash memory}
+The image resulting from a LinuxBIOS build can be directly programmed to
+a flash device, either using a hardware flash programmer or by using the
+Linux flash driver devbios or mtd. This document assumes that you use a
+hardware flash programmer. If you are interested in doing in-system
+software flash programming, find detailed information:
+
+\begin{itemize}
+\item \url{http://www.openbios.org/development/devbios.html} (/dev/bios)
+\item \url{http://www.linuxmtd.infradead.org/} (Memory Technology Device Subsystem MTD)
+\end{itemize}
+
+\newpage
+
+\section{LinuxBIOS configuration}
+The following chapters will cope with configuring LinuxBIOS. All
+configuration files share some basic rules
+\begin{itemize}
+\item
+The default configuration file name in LinuxBIOS is \texttt{Config.lb}.
+\item
+All variables used in a configuration file have to be declared in this
+file with \texttt{uses VARNAME} before usage.
+\item
+Comments can be added on a new line by using the comment identifier
+\texttt{\#} at the beginning of the line.
+\item
+LinuxBIOS distinguishes between statements and options. Statements cause
+the LinuxBIOS configuration mechanism to act, whereas options set
+variables that are used by the build scripts or source code.
+\item
+Default configuration values can be set in the motherboard configuration
+files (keyword default)
+\item
+Option overrides to the default configuration can only be specified in
+the build target configuration file
+\texttt{freebios2/targets/$<$vendor$>$/$<$mainboard$>$/Config.lb}
+(keyword option)
+\end{itemize}
+
+\subsection{Common Configuration Statements}
+
+\begin{itemize}
+
+\item \begin{verbatim}uses\end{verbatim}
+
+All local configuration variables have to be declared before they can be
+used. Example:
+\begin{verbatim}
+ uses ROM_IMAGE_SIZE
+\end{verbatim}
+
+\textbf{NOTE:} Only configuration variables known to the configuration
+system can be used in configuration files. LinuxBIOS checks
+\texttt{freebios2/src/config/Options.lb} to see whether a configuration
+variable is known.
+
+\item \begin{verbatim}default\end{verbatim}
+
+The \texttt{default} statement is used to set a configuration variable
+with an overridable default value. It is commonly used in motherboard
+configuration files.
+
+Example:
+
+\begin{verbatim}
+ default ROM_IMAGE_SIZE=0x10000
+\end{verbatim}
+
+It is also possible to assign the value of one configuration variable to
+another one, i.e.:
+
+\begin{verbatim}
+ default FALLBACK_SIZE=ROM_SIZE
+\end{verbatim}
+
+Also, simple expressions are allowed:
+
+\begin{verbatim}
+ default FALLBACK_SIZE=(ROM_SIZE - NORMAL_SIZE)
+\end{verbatim}
+
+If an option contains a string, this string has to be protected with
+quotation marks:
+
+\begin{verbatim}
+ default CC="gcc ­m32"
+\end{verbatim}
+
+\item \begin{verbatim}option\end{verbatim}
+
+The \texttt{option} statement basically behaves identically to the
+\texttt{default} statement. But unlike default it can only be used in
+build target configuration files
+(\texttt{freebios2/targets/$<$vendor$>$/$<$mainboard$>$}). The option
+statement allows either to set new options or to override default values
+set with the default statement in a motherboard configuration file.
+Syntax and application are the same as with default.
+
+\end{itemize}
+
+\subsection{Firmware image specific configuration}
+LinuxBIOS allows to create different firmware images for the same
+hardware. Such images can differ in the amount of output they produce,
+the payload, the number of subimages they consist of etc.
+
+The firmware image specific configuration file can be found in
+\texttt{freebios2/targets/$<$vendor$>$/<motherboard$>$}.
+
+\subsubsection{Firmware image specific keywords}
+In addition to the above described keywords the following statements are
+available in firmware image specific configuration files:
+
+\begin{itemize}
+\item \begin{verbatim}romimage\end{verbatim}
+
+The \texttt{romimage} definition describes a single rom build within the
+final LinuxBIOS image. Normally there are two romimage definitions per
+LinuxBIOS build: \texttt{normal} and \texttt{fallback}.
+
+Each \texttt{romimage} section needs to specify a mainboard directory and a
+payload. The mainboard directory contains the mainboard specific
+configuration file and source code. It is specified relatively to
+\texttt{freebios2/src/mainboard}. The payload definition is an absolute
+path to a static elf binary (i.e Linux kernel or etherboot)
+
+\begin{verbatim}
+romimage "normal"
+ option USE_FALLBACK_IMAGE=0
+ option ROM_IMAGE_SIZE=0x10000
+ option LINUXBIOS_EXTRA_VERSION=".0Normal"
+ mainboard amd/solo
+ payload /suse/stepan/tg3ide_
+ disk.zelf
+end
+\end{verbatim}
+
+\item \begin{verbatim}buildrom\end{verbatim}
+
+The \texttt{buildrom} statement is used to determine which of the
+LinuxBIOS image builds (created using \texttt{romimage}) are packed
+together to the final LinuxBIOS image. It also specifies the order of
+the images and the final image size:
+
+\begin{verbatim}
+ buildrom ./solo.rom ROM_SIZE "normal" "fallback"
+\end{verbatim}
+
+\end{itemize}
+
+
+\subsubsection{Firmware image configuration options}
+In addition to the definitions described above there are a number of
+commonly used options. Configuration options set in the firmware image
+specific configuration file can override default selections from the
+Motherboard specific configuration. See above examples about
+option on how to set them.
+
+\begin{itemize}
+
+\item \begin{verbatim}CC\end{verbatim}
+
+Target C Compiler. Default is \texttt{\$(CROSS\_COMPILE)gcc}. Set to
+\texttt{gcc ­m32} for compiling AMD64 LinuxBIOS images on an AMD64
+machine.
+
+\item \begin{verbatim}CONFIG_CHIP_CONFIGURE \end{verbatim}
+
+Use new \textit{chip\_configure} method for configuring (nonpci)
+devices. Set to \texttt{1} for all AMD64 motherboards.
+
+\item \begin{verbatim}MAXIMUM_CONSOLE_LOGLEVEL\end{verbatim}
+
+Errors or log messages up to this level can be printed. Default is
+\texttt{8}, minimum is \texttt{0}, maximum is \texttt{10}.
+
+\item \begin{verbatim}DEFAULT_CONSOLE_LOGLEVEL\end{verbatim}
+
+Console will log at this level unless changed. Default is \texttt{7},
+minimum is \texttt{0}, maximum is \texttt{10}.
+
+\item \begin{verbatim}CONFIG_CONSOLE_SERIAL8250\end{verbatim}
+
+Log messages to 8250 uart based serial console. Default is \texttt{0}
+(don't log to serial console). This value should be set to \texttt{1}
+for all AMD64 builds.
+
+\item \begin{verbatim}ROM_SIZE\end{verbatim}
+
+Size of final ROM image. This option has no default value.
+
+\item \begin{verbatim}FALLBACK_SIZE\end{verbatim}
+
+Fallback image size. Defaults to \texttt{65536} bytes. \textbf{NOTE:}
+This does not include the fallback payload.
+
+\item \begin{verbatim}HAVE_OPTION_TABLE\end{verbatim}
+
+Export CMOS option table. Default is \texttt{0}. Set to \texttt{1} if
+your motherboard has CMOS memory and you want to use it to store
+LinuxBIOS parameters (Loglevel, serial line speed, ...)
+
+\item \begin{verbatim}CONFIG_ROM_STREAM\end{verbatim}
+
+Boot image is located in ROM (as opposed to \texttt{CONFIG\_IDE\_STREAM}, which
+will boot from an IDE disk)
+
+\item \begin{verbatim}HAVE_FALLBACK_BOOT\end{verbatim}
+
+Set to \texttt{1} if fallback booting is required. Defaults to
+\texttt{0}.
+
+\end{itemize}
+
+
+The following options should be used within a romimage section:
+
+\begin{itemize}
+
+\item \begin{verbatim}USE_FALLBACK_IMAGE\end{verbatim}
+
+Set to \texttt{1} to build a fallback image. Defaults to \texttt{0}
+
+\item \begin{verbatim}ROM_IMAGE_SIZE\end{verbatim}
+
+Default image size. Defaults to \texttt{65535} bytes.
+
+\item \begin{verbatim}LINUXBIOS_EXTRA_VERSION\end{verbatim}
+
+LinuxBIOS extra version. This option has an empty string as default. Set
+to any string to add an extra version string to your LinuxBIOS build.
+
+\end{itemize}
+
+\newpage
+
+\subsection{Motherboard specific configuration}
+
+Motherboard specific configuration files describe the onboard
+motherboard components, i.e. bridges, number and type of CPUs. They also
+contain rules for building the low level start code which is translated
+using romcc and/or the GNU assembler. This code enables caches and
+registers, early mtrr settings, fallback mechanisms, dram init and
+possibly more.
+
+\textbf{NOTE:} The option keyword can not be used in motherboard specific
+configuration files. Options shall instead be set using the default
+keyword so that they can be overridden by the image specific
+configuration files if needed.
+
+\subsubsection{Motherboard specific keywords}
+
+The following statements are used in motherboard specific configuration
+files:
+
+\begin{itemize}
+\item \begin{verbatim}arch\end{verbatim}
+
+Sets the CPU architecture. This should be \texttt{i386} for AMD64 boards.
+Example:
+
+\begin{verbatim}
+ arch i386 end
+\end{verbatim}
+
+\item \begin{verbatim}cpu\end{verbatim}
+
+The cpu statement is needed once per possibly available CPU. In a
+one-node system, write:
+
+\begin{verbatim}
+ cpu k8 "cpu0" end
+\end{verbatim}
+
+\item \begin{verbatim}driver\end{verbatim}
+
+The \texttt{driver} keyword adds an object file to the driver section of a
+LinuxBIOS image. This means it can be used by the PCI device
+initialization code. Example:
+
+\begin{verbatim}
+ driver mainboard.o
+\end{verbatim}
+
+\item \begin{verbatim}object\end{verbatim}
+
+The \texttt{object} keyword adds an object file to the LinuxBIOS image.
+Per default the object file will be compiled from a \texttt{.c} file
+with the same name. Symbols defined in such an object file can be used
+in other object files and drivers. Example:
+
+\begin{verbatim}
+ object reset.o
+\end{verbatim}
+
+\item \begin{verbatim}makerule\end{verbatim}
+
+This keyword can be used to extend the existing file creation rules
+during the build process. This is useful if external utilities have to
+be used for the build. LinuxBIOS on AMD64 uses romcc for it's early
+startup code placed in auto.c.
+
+To tell the configuration mechanism how to build \texttt{romcc} files,
+do:
+
+\begin{verbatim}
+makerule ./auto.E
+ depends "$(MAINBOARD)/auto.c"
+ action "$(CPP) ­I$(TOP)/src $(ROMCCPPFLAGS) $(CPPFLAGS) \
+ $(MAINBOARD)/auto.c > ./auto.E"
+end
+makerule ./auto.inc
+ depends "./auto.E ./romcc"
+ action "./romcc ­mcpu=k8 ­O ./auto.E > auto.inc"
+end
+\end{verbatim}
+
+Each makerule section contains file dependencies (using the depend
+keyword) and an action that is taken when the dependencies are satisfied
+(using the action keyword).
+
+\item \begin{verbatim}mainboardinit\end{verbatim}
+
+With the mainboardinit keyword it's possible to include assembler code
+directly into the LinuxBIOS image. This is used for early infrastructure
+initialization, i.e. to switch to protected mode. Example:
+
+\begin{verbatim}
+ mainboardinit cpu/i386/entry16.inc
+\end{verbatim}
+
+\item \begin{verbatim}ldscript\end{verbatim}
+
+The GNU linker ld is used to link object files together to a LinuxBIOS
+ROM image.
+
+Since it is a lot more comfortable and flexible to use the GNU linker
+with linker scripts (ldscripts) than to create complex command line
+calls, LinuxBIOS features including linker scripts to control image
+creation. Example:
+
+\begin{verbatim}
+ ldscript /cpu/i386/entry16.lds
+\end{verbatim}
+
+
+\item \begin{verbatim}dir\end{verbatim}
+
+LinuxBIOS reuses as much code between the different ports as possible.
+To achieve this, commonly used code can be stored in a seperate
+directory. For a new motherboard, it is enough to know that the code in
+that directory can be used as is.
+
+LinuxBIOS will also read a \texttt{Config.lb} file stored in that
+directory. This happens with:
+
+\begin{verbatim}
+ dir /pc80
+\end{verbatim}
+
+
+\item \begin{verbatim}config\end{verbatim}
+
+This keyword is needed by the new chip configuration scheme. Should be
+used as:
+
+\begin{verbatim}
+ config chip.h
+\end{verbatim}
+
+\item \begin{verbatim}register\end{verbatim}
+The \texttt{register} keyword can occur in any section, passing
+additional parameters to the code handling the according device.
+Example:
+
+\begin{verbatim}
+ register "com1" = "{1, 0, 0x3f8, 4}"
+\end{verbatim}
+
+\item \begin{verbatim}northbridge\end{verbatim}
+
+The \texttt{northbridge} keyword describes a system northbridge. Some
+systems, like AMD64, can have more than one northbridge, i.e. one per
+CPU node. Each northbridge is described by the path to the northbridge
+code in LinuxBIOS (relative to \texttt{freebios2/src/northbridge}), i.e.
+\texttt{amd/amdk8} and a unique name (i.e ´mc0' ) Example:
+
+\begin{verbatim}
+ northbridge amd/amdk8 "mc0"
+ [..]
+ end
+\end{verbatim}
+
+\item \begin{verbatim}southbridge\end{verbatim}
+
+To simplify the handling of bus bridges in a LinuxBIOS system, all
+bridges available in a system that are not northbridges (i.e AGP, IO,
+PCIX) are seen as southbridges.
+
+Since from the CPUs point of view any southbridge is connected via the
+northbridge, a southbridge section is declared within the northbridge
+section of the north bridge it is attached to.
+
+Like the northbridge, any other bridge is described by the path to it's
+driver code, and a unique name. If the described bridge is a
+hypertransport device, the northbridge's hypertransport link it connects
+to can be specified using the \texttt{link} keyword. Example:
+
+\begin{verbatim}
+northbridge amd/amdk8 "mc0"
+ [..]
+ southbridge amd/amd8111 "amd8111" link 0
+ [..]
+ end
+ [..]
+end
+\end{verbatim}
+
+\item \begin{verbatim}pci\end{verbatim}
+
+The \texttt{pci} keyword can only occur within a \texttt{northbridge} or
+\texttt{southbridge} section. It is used to describe the PCI devices
+that are provided by the bridge. Generally all bridge sections have a
+couple of \texttt{pci} keywords.
+
+The first occurrence of the \texttt{pci} keyword tells LinuxBIOS where
+the bridge devices start, relative to the PCI configuration space used
+by the bridge. The following occurences of the \texttt{pci} keyword
+describe the provided devices.
+
+Adding the option \texttt{on} or \texttt{off} to a PCI device will
+enable or disable this device. This feature can be used if some bridge
+devices are not wired to hardware outputs and thus are not used.
+
+Example:
+
+\begin{verbatim}
+northbridge amd/amdk8 "mc1"
+ pci 0:19.0
+ pci 0:19.0
+ pci 0:19.0
+ pci 0:19.1
+ pci 0:19.2
+ pci 0:19.3
+end
+\end{verbatim}
+
+or
+
+\begin{verbatim}
+southbridge amd/amd8111 "amd8111" link 0
+ pci 0:0.0
+ pci 0:1.0 on
+ pci 0:1.1 on
+ pci 0:1.2 on
+ pci 0:1.3 on
+ pci 0:1.5 off
+ pci 0:1.6 off
+ pci 1:0.0 on
+ pci 1:0.1 on
+ pci 1:0.2 on
+ pci 1:1.0 off
+ [..]
+end
+\end{verbatim}
+
+\item \begin{verbatim}superio\end{verbatim}
+
+SuperIO devices are basically handled like brigdes. They are taking
+their driver code from \texttt{freebios2/src/superio/}. They don't
+provide a PCI compatible configuration interface, but instead are ISA
+PnP devices. Normally they are connected to a southbridge. If this is
+the case, the \texttt{superio} section will be a subsection of the
+\texttt{southbridge} section of the southbridge it is connected to.
+Example:
+
+\begin{verbatim}
+superio NSC/pc87360 link 1
+ pnp 2e.0
+ pnp 2e.1
+ pnp 2e.2
+ pnp 2e.3
+ pnp 2e.4
+ pnp 2e.5
+ pnp 2e.6
+ pnp 2e.7
+ pnp 2e.8
+ pnp 2e.9
+ pnp 2e.a
+ register "com1" = "{1, 0, 0x3f8, 4}"
+ register "lpt" = "{1}"
+end
+\end{verbatim}
+
+\end{itemize}
+
+\newpage
+
+\subsubsection{Motherboard specific configuration options}
+
+The following options are commonly used in motherboard specific
+configuration files.
+
+They should be set using the \texttt{default} keyword:
+
+\begin{itemize}
+
+\item \begin{verbatim}HAVE_HARD_RESET\end{verbatim}
+
+If set to \texttt{1}, this option defines that there is a hard reset
+function for this mainboard. This option is not defined per default.
+
+\item \begin{verbatim}HAVE_PIRQ_TABLE\end{verbatim}
+
+If set to \texttt{1}, this option defines that there is an IRQ Table for
+this mainboard. This option is not defined per default.
+
+\item \begin{verbatim}IRQ_SLOT_COUNT\end{verbatim}
+
+Number of IRQ slots. This option is not defined per default.
+
+\item \begin{verbatim}HAVE_MP_TABLE\end{verbatim}
+
+Define this option to build an MP table (v1.4). The default is not to
+build an MP table.
+
+\item \begin{verbatim}HAVE_OPTION_TABLE\end{verbatim}
+
+Define this option to export a CMOS option table. The default is not to
+export a CMOS option table.
+
+\item \begin{verbatim}CONFIG_SMP\end{verbatim}
+
+Set this option to \texttt{1} if the mainboard supports symmetric
+multiprocessing (SMP). This option defaults to \texttt{0} (no SMP).
+
+\item \begin{verbatim}CONFIG_MAX_CPUS\end{verbatim}
+
+If \begin{verbatim}CONFIG_SMP\end{verbatim} is set, this option defines
+the maximum number of CPUs (i.e. the number of CPU sockets) in the
+system. Defaults to \texttt{1}.
+
+\item \begin{verbatim}CONFIG_IOAPIC\end{verbatim}
+
+Set this option to \texttt{1} to enable IOAPIC support. This is
+mandatory if you want to boot a 64bit Linux kernel on an AMD64 system.
+
+\item \begin{verbatim}STACK_SIZE\end{verbatim}
+
+LinuxBIOS stack size. The size of the function call stack defaults to
+\texttt{0x2000} (8k).
+
+\item \begin{verbatim}HEAP_SIZE\end{verbatim}
+
+LinuxBIOS heap size. The heap is used when LinuxBIOS allocates memory
+with malloc(). The default heap size is \texttt{0x2000}, but AMD64 boards
+generally set it to \texttt{0x4000} (16k)
+
+\item \begin{verbatim}XIP_ROM_BASE\end{verbatim}
+
+Start address of area to cache during LinuxBIOS execution directly from
+ROM.
+
+\item \begin{verbatim}XIP_ROM_SIZE\end{verbatim}
+
+Size of area to cache during LinuxBIOS execution directly from ROM
+
+\item \begin{verbatim}CONFIG_COMPRESS\end{verbatim}
+
+Set this option to \texttt{1} for a compressed image. If set to
+\texttt{0}, the image is bigger but will start slightly faster (since no
+decompression is needed).
+
+\end{itemize}
+
+
+\newpage
+%
+% 9. Tweaking the source code
+%
+\section{Tweaking the source code}
+Besides configuring the existing code it is sometimes necessary or
+wished to tweak certain parts of LinuxBIOS by direct changes to the
+code. This chapter covers some possible enhancements and changes that
+are needed when porting LinuxBIOS to a new motherboard or just come
+handy now and then.
+
+\subsection{Hypertransport configuration}
+Before LinuxBIOS is able to activate all CPUs and detect bridges
+attached to these CPUs (and thus, see all devices attached to the
+system) it has to initialize the coherent hypertransport devices.
+
+The current algorithms to do coherent hypertransport initialization are
+not fully automatically evaluating the hypertransport chain graph.
+Therefore the code needs to be adapted when porting LinuxBIOS to a new
+AMD64 motherboard. An example arrangement of hypertransport devices
+looks like this:
+
+\begin{figure}[htb]
+\centering
+\includegraphics[scale=1.0]{hypertransport.pdf}
+\caption{Example: Hypertransport Link Connections}
+\label{fix:hypertransport}
+\end{figure}
+
+Each hypertransport device has one to three hypertransport links that
+are used for device interconnection. These links are called LDT$[$012$]$, or
+accordingly UP, ACROSS, DOWN. Communication between the hypertransport
+devices can be freely routed, honoring the physical wiring. Teaching the
+coherent hypertransport initialization algorithm this wiring happens in
+two steps.
+
+\newpage
+
+\begin{enumerate}
+\item Setting outgoing connections
+The algorithm needs to know which outgoing port of a CPU node is
+connected to the directly succeeding node. This is done in
+\texttt{freebios2/src/mainboard/$<$vendor$>$/$<$mainboard$>$/auto.c}
+with a number of preprocessor defines (one define for two-node systems,
+three defines for four-node systems).
+
+The ports in question are flagged with a circle in the graph for
+illustration. For the example graph above (all outgoing connections are
+realized using LDT1/ACROSS) the defines are:
+
+\begin{verbatim}
+#define CONNECTION_0_1 ACROSS
+#define CONNECTION_0_2 ACROSS
+#define CONNECTION_1_3 ACROSS
+\end{verbatim}
+
+\item Describing routing information between CPUs.
+
+There are basically three different message types for hypertransport
+communication:
+\begin{enumerate}
+\item request packages
+\item response packages
+\item broadcast packages
+\end{enumerate}
+
+These three message types are routed using different hypertransport
+ports. The routing information is written to the AMD K8 routing table.
+In an Nnode system this routing table consists of 3*N*N entries , one
+for each message type and for each possible CPU --> CPU communication. For
+simplicity LinuxBIOS keeps the 3 routing entries for each CPU --> CPU
+communication in one machine word. The routing table of each node looks
+like this:
+
+\begin{verbatim}
+/* Routing Table for Node i
+ *
+ * F0: 0x40, 0x44, 0x48, 0x4c, 0x50, 0x54, 0x58, 0x5c
+ * i: 0, 1, 2, 3, 4, 5, 6, 7
+ *
+ * [ 0: 3] Request Route
+ * [0] Route to this node
+ * [1] Route to Link 0
+ * [2] Route to Link 1
+ * [3] Route to Link 2
+ * [11: 8] Response Route
+ * [0] Route to this node
+ * [1] Route to Link 0
+ * [2] Route to Link 1
+ * [3] Route to Link 2
+ * [19:16] Broadcast route
+ * [0] Route to this node
+ * [1] Route to Link 0
+ * [2] Route to Link 1
+ * [3] Route to Link 2
+ */
+\end{verbatim}
+
+The routing table is passed to the coherent hypertransport
+initialization algorithm by defining a function called
+\texttt{generate\_row()} in \texttt{auto.c}:
+
+\begin{verbatim}
+static unsigned int generate_row
+ (uint8_t node, uint8_t row, uint8_t maxnodes)
+\end{verbatim}
+
+This function is trivial if there is only one CPU in the system, since
+no routing has to be done:
+
+\begin{verbatim}
+static unsigned int generate_row
+ (uint8_t node, uint8_t row, uint8_t maxnodes)
+{
+ return 0x00010101; /* default row entry */
+}
+\end{verbatim}
+
+On a two-node system things look slightly more complicated. Since the
+coherent hypertransport initialization algorithm works by consecutively
+enabling CPUs, it contains routing information for driving the system
+with one node and two nodes:
+
+\begin{verbatim}
+static unsigned int generate_row
+ (uint8_t node, uint8_t row, uint8_t maxnodes)
+{
+ uint32_t ret=0x00010101; /* default row entry */
+ static const unsigned int rows_2p[2][2] = {
+ { 0x00050101, 0x00010404 },
+ { 0x00010404, 0x00050101 }
+ };
+ if(maxnodes>2) maxnodes=2;
+ if (!(node>=maxnodes || row>=maxnodes)) {
+ ret=rows_2p[node][row];
+ }
+ return ret;
+}
+\end{verbatim}
+
+Systems with four nodes have to contain routing information for one, two
+and four-node setups:
+
+\begin{verbatim}
+static unsigned int generate_row
+ (uint8_t node, uint8_t row, uint8_t maxnodes)
+{
+ uint32_t ret=0x00010101; /* default row entry */
+ static const unsigned int rows_2p[2][2] = {
+ { 0x00030101, 0x00010202 },
+ { 0x00010202, 0x00030101 }
+ };
+ static const unsigned int rows_4p[4][4] = {
+ { 0x00070101, 0x00010202, 0x00030404, 0x00010204 },
+ { 0x00010202, 0x000b0101, 0x00010208, 0x00030808 },
+ { 0x00030808, 0x00010208, 0x000b0101, 0x00010202 },
+ { 0x00010204, 0x00030404, 0x00010202, 0x00070101 }
+ };
+ if (!(node>=maxnodes || row>=maxnodes)) {
+ if (maxnodes==2)
+ ret=rows_2p[node][row];
+ if (maxnodes==4)
+ ret=rows_4p[node][row];
+ }
+ return ret;
+}
+\end{verbatim}
+\end{enumerate}
+
+\subsection{DRAM configuration}
+Setting up the RAM controller(s) is probably the most complex part of
+LinuxBIOS. Basically LinuxBIOS serially initializes all RAM controllers
+in the system, using SPDROM (serial presence detect) data to set
+timings, size and other properties. The SPD data is usually read
+utilizing the I2C SMBUS interface of the southbridge.
+
+There is one central data structure that describes the RAM controllers
+available on an AMD64 system and the concerned devices:
+
+\begin{verbatim}
+struct mem_controller {
+ unsigned node_id;
+ device_t f0, f1, f2, f3;
+ uint8_t channel0[4];
+ uint8_t channel1[4];
+};
+\end{verbatim}
+
+Available motherboard implementations and CPUs create the need to add
+special setup code to RAM initialization in a number of places.
+LinuxBIOS provides hooks to easily add code in these places without
+having to change the generic code. Whether these hooks have to be used
+depends on the motherboard design. In many cases the functions executed
+by the hooks just carry out trivial default settings or they are even
+empty.
+
+Some motherboard/CPU combinations need to trigger an additional memory
+controller reset before the memory can be initialized properly. This is,
+for example, used to get memory working on preC stepping AMD64
+processors. LinuxBIOS provides two hooks for triggering onboard memory
+reset logic:
+
+\begin{itemize}
+\item \begin{verbatim}static void memreset_setup(void)\end{verbatim}
+\item \begin{verbatim}static void memreset(int controllers, const struct
+ mem_controller *ctrl)\end{verbatim}
+\end{itemize}
+
+Some motherboards utilize an SMBUS hub or possibly other mechanisms to
+allow using a large number of SPDROMs and thus ram sockets. The result
+is that only the SPDROM information of one cpu node is visible at a
+time. The following function, defined in \texttt{auto.c}, is called every time
+before a memory controller is initialized and gets the memory controller
+information of the next controller as a parameter:
+
+\begin{verbatim}
+static inline void activate_spd_rom (const struct mem_controller *ctrl)
+\end{verbatim}
+
+The way SMBUS hub information is coded into the \texttt{mem\_controller}
+structure is motherboard implementation specific and not closer
+described here. See \texttt{freebios2/src/mainboard/amd/quartet/auto.c}
+for an example.
+
+LinuxBIOS folks have agreed on SPD data being the central information
+source for RAM specific information. But not all motherboards/RAM
+modules feature a physical SPD ROM. To still allow an easytouse SPD
+driven setup, there is a hook that abstracts reading the SPD ROM
+ingredients that are used by the memory initialization mechanism:
+
+\begin{verbatim}
+static inline int spd_read_byte(unsigned device, unsigned address)
+\end{verbatim}
+
+This function, defined in \texttt{auto.c}, directly maps it's calls to
+\texttt{smbus\_read\_byte()} calls if SPD ROM information is read via
+the I2C SMBUS:
+
+\begin{verbatim}
+static inline int spd_read_byte(unsigned device, unsigned address)
+{
+ return smbus_read_byte(device & 0xff, address);
+}
+\end{verbatim}
+
+If there is no SPD ROM available in the system design, this function
+keeps an array of SPD ROM information hard coded per logical RAM module.
+It returns the ´faked' SPD ROM information using device and address
+as indices to this array.
+
+
+\subsection {IRQ Tables}
+
+Motherboards that provide an IRQ table should have the following two
+variables set in their \texttt{Config.lb} file:
+
+\begin{verbatim}
+default HAVE_PIRQ_TABLE=1
+default IRQ_SLOT_COUNT=7
+\end{verbatim}
+
+This will make LinuxBIOS look for the file
+\texttt{freebios2/src/mainboard/<vendor>/<motherboard>/irq\_tables.c} which
+contains the source code definition of the IRQ table. LinuxBIOS corrects
+small inconsistencies in the IRQ table during startup (checksum and
+number of entries), but it is not yet writing IRQ tables in a completely
+dynamic way.
+
+\textbf{NOTE:} To get Linux to understand and actually use the IRQ
+table, it is not always a good idea to specify the vendor and device id
+of the actually present interrupt router device. Linux 2.4 for example
+does not know about the interrupt router of the AMD8111 southbridge. In
+such cases it is advised to choose the vendor/device id of a compatible
+device that is supported by the Linux kernel. In case of the AMD8111
+interrupt router it is advised to specify the AMD768/Opus interrupt
+controller instead (vendor id=\texttt{0x1022}, device id=\texttt{0x7443})
+
+\subsection {MP Tables}
+
+LinuxBIOS contains code to create MP tables conforming the
+Multiprocessor Specification V1.4. To include an MP Table in a LinuxBIOS
+image, the following configuration variables have to be set (in the
+mainboard specific configuration file
+\texttt{freebios2/src/mainboard/<vendor><mainboard>/Config.lb}):
+
+\begin{verbatim}
+default CONFIG_SMP=1
+default CONFIG_MAX_CPUS=1 # 2,4,..
+default HAVE_MP_TABLE=1
+\end{verbatim}
+
+LinuxBIOS will then look for a function for setting up the MP table in
+the file \texttt{freebios2/src/mainboard<vendor>/<mainboard>/mptable.c}:
+
+\begin{verbatim}
+void *smp_write_config_table(void *v, unsigned long * processor_map)
+\end{verbatim}
+
+MP Table generation is still somewhat static, i.e. changing the bus
+numbering will force
+you to adopt the code in mptable.c. This is subject to change in future
+revisions.
+
+\subsection{POST}
+LinuxBIOS has three different methods of handling POST codes. They can
+be triggered using configuration file options.
+\begin{itemize}
+\item
+\emph{Ignore POST completely}. No early code debugging is possible with
+this setting. Set the configuration variable \texttt{NO\_POST} to
+\texttt{1} to switch off all POST handling in LinuxBIOS.
+\item
+\emph{Normal IO port 80 POST}. This is the default behavior of
+LinuxBIOS. No configuration variables have to be set. To be able to see
+port 80 POST output, you need a POST expansion card for ISA or PCI. Port
+80 POST allows simple debugging without any other output method
+available (serial interface or VGA display)
+\item
+\emph{Serial POST}.
+This option allows to push POST messages to the serial interface instead
+of using IO ports. \textbf{NOTE:} The serial interface has to be
+initialized before serial POST can work. To use serial POST, set the
+configuration variable \texttt{CONFIG\_SERIAL\_POST} to the value 1.
+\end{itemize}
+
+
+\subsection{HDT Debugging}
+If you are debugging your LinuxBIOS code with a Hardware Debug Tool
+(HDT), you can find the source code line for a given physical EIP
+address as follows: Look the address up in the file linuxbios.map. Then
+search the label Lxx in the file auto.inc created by romcc. The original
+source code file and line number is mentioned in auto.inc.
+
+
+\subsection{Device Drivers}
+With only a few data structures LinuxBIOS features a simple but flexible
+device driver interface. This interface is not intended for autonomously
+driving the devices but to initialize all system components so that they
+can be used by the booted operating system.
+
+Since nowadays most systems are PCI centric, the data structures used
+are tuned towards (onboard and expansion bus) PCI devices. Each driver
+consists of at least two structures.
+
+The \texttt{pci\_driver} structure maps PCI vendor/device id pairs to a
+second structure that describes a set of functions that together
+initialize and operate the device:
+
+\begin{verbatim}
+ static void adaptec_scsi_init(struct device *dev)
+ {
+ [..]
+ }
+ static struct device_operations lsi_scsi_ops = {
+ .read_resources = pci_dev_read_resources,
+ .set_resources = pci_dev_set_resources,
+ .enable_resources = pci_dev_enable_resources,
+ .init = lsi_scsi_init,
+ .scan_bus = 0,
+ };
+ static struct pci_driver lsi_scsi_driver __pci_driver = {
+ .ops = &lsi_scsi_ops,
+ .vendor = 0xXXXX,
+ .device = 0xXXXX,
+ };
+\end{verbatim}
+
+By separating the two structures above, M:N relations between compatible
+devices and drivers can be described. The driver source code containing
+above data structures and code have to be added to a LinuxBIOS image
+using the driver keyword in the motherboard specific configuration file
+\texttt{freebios2/src/mainboard/<vendor>/<mainboard>/Config.lb}:
+
+\begin{verbatim}
+ driver lsi_scsi.o
+\end{verbatim}
+
+\subsection{Bus Bridges}
+
+Currently all bridges supported in the LinuxBIOS2 tree are transparent
+bridges. This means, once the bridge is initialized, it's remote devices
+are visible on one of the PCI buses without special probing. LinuxBIOS
+supports also bridges that are nontransparent. The driver support code
+can provide a \texttt{scan\_bus} function to scan devices behind the bridge.
+
+\subsection{CPU Reset}
+When changing speed and width of hypertransport chain connections
+LinuxBIOS has to either assert an LDTSTOP or a reset to make the changes
+become active. Additionally Linux can do a firmware reset, if LinuxBIOS
+provides the needed infrastructure. To use this capability, define the
+option \texttt{HAVE\_HARD\_RESET} and add an object file specifying the
+reset code in your mainboard specific configuration file
+\texttt{freebios2/src/mainboard/$<$vendor$>$/$<$mainboard$>$/Config.lb}:
+
+\begin{verbatim}
+ default HAVE_HARD_RESET=1
+ object reset.o
+\end{verbatim}
+
+The C source file \texttt{reset.c} (resulting in \texttt{reset.o}
+during compilation) shall define the following function to take care
+of the system reset:
+
+\begin{verbatim}
+ void hard_reset(void);
+\end{verbatim}
+
+See \texttt{freebios2/src/mainboard/arima/hdama/reset.c} for an example
+implementation.
+
+\newpage
+
+%
+% 10. LinuxBIOS Internals
+%
+
+\section{LinuxBIOS Internals}
+This chapter covers some of the internal structures and algorithms of
+LinuxBIOS that have not been mentioned so far.
+
+\subsection{Code Flow}
+
+\begin{figure}[htb]
+\centering
+\includegraphics[scale=0.7]{codeflow.pdf}
+\caption{LinuxBIOS rough Code Flow}
+\label{fix:codeflow}
+\end{figure}
+
+\newpage
+
+\subsection{Fallback mechanism}
+LinuxBIOS provides a mechanism to pack two different LinuxBIOS builds
+within one LinuxBIOS ROM image. Using the system CMOS memory LinuxBIOS
+determines whether the last boot with a default image succeeded and
+boots a failsafe image on failure. This allows insystem testing without
+the risk to render the system unusable. See
+\texttt{freebios2/src/mainboard/arima/hdama/failover.c} for example
+code. The fallback mechanism can be used with the \texttt{cmos\_util}.
+
+\subsection{(Un) Supported Standards}
+LinuxBIOS supports the following standards
+\begin{itemize}
+\item Multiprocessing Specification (MPSPEC) 1.4
+\item IRQ Tables
+\item Elf Booting
+\end{itemize}
+However, the following standards are not supported until now, and will
+probably not be supported in future revisions:
+\begin{itemize}
+\item ACPI
+\item APM
+\end{itemize}
+
+\subsection{LinuxBIOS table}
+LinuxBIOS stores information about the system in a data structure called
+the LinuxBIOS table. This table can be read under Linux using the tool
+lxbios from the Lawrence Livermore National Laboratory.
+
+Get more information about lxbios and the utility itself at
+\url{http://www.llnl.gov/linux/lxbios/lxbios.html}
+
+\subsection{ROMCC limitations}
+ROMCC, part of the LinuxBIOS project, is a C compiler that translates to
+completely rommable code. This means the resulting code does not need
+any memory to work. This is one of the major improvements in LinuxBIOS
+V2, since it allows almost all code to be written in C. DRAM
+initialization can be factored and reused more easily among mainboards
+and platforms.
+
+Since no memory is available during this early initialization point,
+romcc has to map all used variables in registers for their time being.
+Same applies for their stack usage. Generally the less registers are
+used up by the algorithms, the better code can be factored, resulting in
+a smaller object size. Since getting the best register usage is an NP
+hard problem, some heuristics are used to get reasonable translation
+time. If you run out of registers during compilation, try to refactor
+your code.
+
+\subsection{CMOS handling}
+LinuxBIOS can use the motherboard's CMOS memory to store information
+defined in a data structure called the CMOS table . This information
+contains serial line speed, fallback boot control, output verbosity,
+default boot device, ECC control, and more. It can be easily enhanced by
+enhancing the CMOS table. This table, if present, is found at
+\texttt{freebios2/src/mainboard/$<$vendor$>$/$<$mainboard$>$/cmos.layout}.
+It describes the available options, their possible values and their
+position within the CMOS memory. The layout file looks as follows:
+\begin{verbatim}
+ # startbit length config configID name
+ [..]
+ 392 3 e 5 baud_rate
+ [..]
+
+ # configid value human readable description
+ 5 0 115200
+ 5 1 57600
+ 5 2 38400
+ 5 3 19200
+ 5 4 9600
+ 5 5 4800
+ 5 6 2400
+ 5 7 1200
+
+\end{verbatim}
+
+To change CMOS values from a running Linux system, use the
+\texttt{cmos\_util}, provided by Linux Networks as part of the LinuxBIOS
+utilities suite. Get it at
+\textit{ftp://ftp.lnxi.com/pub/linuxbios/utilities/}
+
+\subsection {Booting Payloads}
+LinuxBIOS can load a payload binary from a Flash device or IDE. This
+payload can be a boot loader, like FILO or Etherboot, a kernel image, or
+any other static ELF binary.
+
+To create a Linux kernel image, that is bootable in LinuxBIOS, you have
+to use mkelfImage. The command line I used, looks like follows:
+
+\begin{verbatim}
+ objdir/sbin/mkelfImage ­t bzImagei386 ­kernel /boot/vmlinuz \
+ ­commandline="console=ttyS0,115200 root=/dev/hda3" \
+ ­initrd=/boot/initrd ­output vmlinuz.elf
+\end{verbatim}
+
+
+This will create the file \texttt{vmlinuz.elf} from a distribution
+kernel, console redirected to the serial port and using an initial
+ramdisk.
+
+\subsection{Kernel on dhcp/tftp}
+
+One possible scenario during testing is that you keep your kernel (or
+any additional payload) on a different machine on the network. This can
+quickly be done using a DHCP and TFTP server.
+
+Use for example following \texttt{/etc/dhcpd.conf} (adapt to your
+network):
+
+\begin{verbatim}
+ subnet 192.168.1.0 netmask 255.255.255.0 {
+ range 192.168.1.0 192.168.1.31;
+ option broadcastaddress 192.168.1.255;
+ }
+
+ ddnsupdatestyle adhoc;
+
+ host hammer12 {
+ hardware ethernet 00:04:76:EA:64:31;
+ fixedaddress 192.168.1.24;
+ filename "vmlinuz.elf";
+ }
+\end{verbatim}
+
+
+Additionally you have to run a \texttt{tftp} server. You can start one
+using \texttt{inetd}. To do this, you have to remove the comment from
+the following line in \texttt{/etc/inetd.conf}:
+
+\begin{verbatim}
+ tftp dgram udp wait root /usr/sbin/in.tftpd in.tftpd -s /tftpboot
+\end{verbatim}
+
+Then put your kernel image \texttt{vmlinuz.elf} to \texttt{/tftpboot} on
+the \texttt{tftp} server.
+
+
+\newpage
+
+%
+% 11 Glossary
+%
+
+\section{Glossary}
+\begin{itemize}
+\item payload
+
+LinuxBIOS only cares about lowlevel machine initialization, but also has
+very simple mechanisms to boot a file either from FLASHROM or IDE. That
+file, possibly a Linux Kernel, a boot loader or Etherboot, are called
+payload, since it is the first software executed that does not cope with
+pure initialization.
+
+\item flash device
+
+Flash devices are commonly used in all different computers since unlike
+ROMs they can be electronically erased and reprogrammed.
+\end{itemize}
+
+\newpage
+
+%
+% 12 Bibliography
+%
+
+\section{Bibliography}
+\subsection{Additional Papers on LinuxBIOS}
+
+\begin{itemize}
+ \item { \small
+ \textit{\url{http://www.linuxnetworx.com/products/linuxbios_white_paper.pdf}}
+ }
+ \item
+ \textit{\url{http://www.linuxbios.org/papers/}}
+ \item
+ \textit{\url{http://www.lysator.liu.se/upplysning/fa/linuxbios.pdf}}
+ \item
+ \textit{\url{http://portal.acm.org/citation.cfm?id=512627}}
+\end{itemize}
+
+\subsection {Links}
+
+\begin{itemize}
+ \item Etherboot: \textit{\url{http://www.etherboot.org/}}
+ \item Filo: \textit{\url{http://te.to/~ts1/filo/}}
+ \item OpenBIOS: \textit{\url{http://www.openbios.org/}}
+\end{itemize}
+
+\end{document}
diff --git a/documentation/Makefile b/documentation/Makefile
new file mode 100644
index 0000000000..1b063ffa3f
--- /dev/null
+++ b/documentation/Makefile
@@ -0,0 +1,33 @@
+#
+# Makefile for LinuxBIOS paper.
+# hacked together by Stefan Reinauer <stepan@openbios.org>
+#
+
+PDFLATEX=pdflatex -t a4
+
+FIGS=codeflow.pdf hypertransport.pdf
+
+all: LinuxBIOS-AMD64.pdf
+
+
+codeflow.pdf: codeflow.eps
+ epstopdf $< -o=$@
+
+hypertransport.pdf: hypertransport.eps
+ epstopdf $< -o=$@
+
+LinuxBIOS-AMD64.toc: $(FIGS) LinuxBIOS-AMD64.tex
+ # 2 times to make sure we have a current toc.
+ $(PDFLATEX) LinuxBIOS-AMD64.tex
+ $(PDFLATEX) LinuxBIOS-AMD64.tex
+
+LinuxBIOS-AMD64.pdf: $(FIGS) LinuxBIOS-AMD64.tex LinuxBIOS-AMD64.toc
+ $(PDFLATEX) LinuxBIOS-AMD64.tex
+
+clean:
+ rm -f *.aux *.idx *.log *.toc *.out $(FIGS)
+
+distclean: clean
+ rm -f LinuxBIOS-AMD64.pdf
+
+
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