4b18a922f0
The word 'coreboot' should always be written in lowercase, even at the start of a sentence. Unfortunately, some external websites and projects are spelling coreboot with an uppercase C, so references to those pages can't be changed without breaking the link. Change-Id: I79824da8a9ed36a1e4fe23a1711a89535267bf5f Signed-off-by: Martin Roth <martinroth@google.com> Reviewed-on: https://review.coreboot.org/20031 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
672 lines
21 KiB
TeX
672 lines
21 KiB
TeX
%
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% This document is released under the GPL
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% Initially written by Stefan Reinauer, <stepan@coresystems.de>
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%
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\documentclass[titlepage,12pt]{article}
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\usepackage{a4}
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\usepackage{graphicx}
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\usepackage{epsfig}
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\usepackage{epstopdf}
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\usepackage{url}
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\usepackage{color}
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% \usepackage{geometry}
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\usepackage[pdftex]{hyperref}
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% \usepackage{makeidx}
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% \makeindex
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% \geometry{left=2cm,right=2cm,top=2cm,bottom=2cm}
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\hypersetup{
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urlbordercolor={1 1 1},
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menubordercolor={1 1 1},
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linkbordercolor={1 1 1},
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colorlinks=false,
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% pdfpagemode=None, % PDF-Viewer starts without TOC
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% pdfstartview=FitH,
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pdftitle={coreboot Porting Guide},
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pdfauthor={Zheng Bao},
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pdfsubject={coreboot configuration and build process},
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pdfkeywords={coreboot, AMD, configuration, Build}
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}
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\setlength{\parindent}{0pt}
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\setlength{\hoffset}{0pt}
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\title{coreboot from Scratch}
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\author{Stefan Reinauer $<$stepan@coresystems.de$>$\and Zheng Bao $<$zheng.bao@amd.com$>$}
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\date{Dec 4th, 2013}
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\begin{document}
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\maketitle
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\thispagestyle{empty}
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\tableofcontents
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\newpage
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\section{What is coreboot}
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coreboot aims to replace the normal BIOS found on x86, AMD64, PPC,
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Alpha, and other machines with a Linux kernel that can boot Linux from a cold
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start. The startup code of an average coreboot port is about 500 lines of
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assembly and 5000 lines of C. It executes 16 instructions to get into 32bit
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protected mode and then performs DRAM and other hardware initializations
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required before Linux can take over.
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The projects primary motivation initially was maintenance of large
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clusters. Not surprisingly interest and contributions have come from
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people with varying backgrounds. Nowadays a large and growing number of
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Systems can be booted with coreboot, including embedded systems,
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Desktop PCs and Servers.
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This document is used to build, modify, and port the coreboot code
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base on the AMD platform.
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\section{Changes}
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\begin{itemize}
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\item 2013/12/20 Add Git, Gerrit, toolchains building.
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\item 2009/04/19 replace LinuxBIOS with coreboot
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\item 2004/06/02 url and language fixes from Ken Fuchs $<$kfuchs@winternet.com$>$
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\item 2004/02/10 ACPI and option ROM updates
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\item 2003/11/18 initial release
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\end{itemize}
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%
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% Build Requirements
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%
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\section{Build Requirements}
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To build coreboot for AMD64 from the sources you need a recent Linux.
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SUSE Linux 11.2, CentOS release 6.3, Fedora Core 16, Cygwin, FreeBSD,
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NetBSD are known to work fine.
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To build the toolchain, you need following host compilers:
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\begin{itemize}
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\item GNUtar
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\item GNUpatch
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\item GNUmake
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\item GCC
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\item binutils
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\item bison
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\item flex
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\item m4
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\item wget
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\end{itemize}
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Besides the tools above, after the toolchains are built, you also need the following
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tools to build the source.
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\begin{itemize}
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\item git: Get the source code from repository
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\item libncurses-dev (or ncursesw, ncurses, curses, pdcursesw, pdcurses): for menuconfig
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\item python: Optional for gdb.
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\item perl: Optional for gdb.
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\end{itemize}
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%
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% Getting coreboot
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%
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\section{Getting coreboot}
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The latest coreboot sources are available via GIT.
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For users who doesn't need to change and commit the code:
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{ \small
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\begin{verbatim}
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$ git clone https://review.coreboot.org/p/coreboot
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\end{verbatim}
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}
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For developers, you need to get a gerrit account which you can register
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at \url{https://review.coreboot.org}. Please refer section ~\ref{sec:gerrit}
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{ \small
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\begin{verbatim}
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$ git clone ssh://<username>@review.coreboot.org:29418/coreboot
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$ git clone https://[<username>:<password>@]review.coreboot.org/coreboot.git
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\end{verbatim}
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}
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Checks out a sub-repository in the 3rdparty directory.
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{ \small
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\begin{verbatim}
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$ git submodule update --init --checkout
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\end{verbatim}
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}
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%
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% Building the toolchain
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%
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\section{Building the toolchain}
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coreboot recommends and guarantees the toolchain integrated with coreboot.
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Linux distributions usually modify their compilers in ways incompatible with coreboot.
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{ \small
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\begin{verbatim}
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$ cd coreboot
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$ make crossgcc
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\end{verbatim}
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}
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or
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{ \small
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\begin{verbatim}
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$ cd util/crossgcc
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$ buildgcc
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\end{verbatim}
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}
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The buildgcc will try to get packages from website. You need to make sure you can
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get access the internet. Or you can get the source.tar.gz and put it in util/crossgcc/tarballs.
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{ \small
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\textcolor{blue} {Welcome to the} \textcolor{red} {coreboot} \textcolor{blue} {cross toolchain builder v1.23 (September 20th, 2013)}
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Target arch is now i386-elf
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Will skip GDB ... ok
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Downloading tar balls ...
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* gmp-5.1.2.tar.bz2 (cached)
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* mpfr-3.1.2.tar.bz2 (cached)
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* mpc-1.0.1.tar.gz (cached)
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* libelf-0.8.13.tar.gz (cached)
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* gcc-4.7.3.tar.bz2 (cached)
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* binutils-2.23.2.tar.bz2 (cached)
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* acpica-unix-20130626.tar.gz (cached)
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Downloaded tar balls ... \textcolor {green}{ok}
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Unpacking and patching ...
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* gmp-5.1.2.tar.bz2
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* mpfr-3.1.2.tar.bz2
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* mpc-1.0.1.tar.gz
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* libelf-0.8.13.tar.gz
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* gcc-4.7.3.tar.bz2
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* binutils-2.23.2.tar.bz2
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o binutils-2.23.2\_arv7a.patch
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o binutils-2.23.2\_no-bfd-doc.patch
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* acpica-unix-20130626.tar.gz
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Unpacked and patched ... \textcolor {green}{ok}
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Building GMP 5.1.2 ... \textcolor {green}{ok}
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Building MPFR 3.1.2 ... \textcolor {green}{ok}
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Building MPC 1.0.1 ... \textcolor {green}{ok}
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Building libelf 0.8.13 ... \textcolor {green}{ok}
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Building binutils 2.23.2 ... \textcolor {green}{ok}
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Building GCC 4.7.3 ... ok
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Skipping Expat (Python scripting not enabled)
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Skipping Python (Python scripting not enabled)
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Skipping GDB (GDB support not enabled)
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Building IASL 20130626 ... \textcolor {green}{ok}
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Cleaning up... \textcolor {green}{ok}
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\textcolor {green}{You can now run your i386-elf cross toolchain from /home/baozheng/x86/coreboot-gerrit/util/crossgcc/xgcc.}
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}
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If you are lucky, you can get toolchains located in util/crossgcc/xgcc.
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%
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% Build coreboot
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%
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\section{Building coreboot}
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\subsection{Build main module of coreboot}
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{ \small
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\begin{verbatim}
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$ cd coreboot
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$ make menuconfig
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.config - coreboot v4.0-4895-gc5025a4-dirty Configuration
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+------------------------ coreboot Configuration -------------------------+
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| Arrow keys navigate the menu. <Enter> selects submenus --->. |
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| Highlighted letters are hotkeys. Pressing <Y> includes, <N> excludes, |
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| <M> modularizes features. Press <Esc><Esc> to exit, <?> for Help, </> |
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| for Search. Legend: [*] built-in [ ] excluded <M> module < > |
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| +---------------------------------------------------------------------+ |
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| | General setup ---> | |
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| | Mainboard ---> | |
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| | Architecture (x86) ---> | |
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| | Chipset ---> | |
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| | Devices ---> | |
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| | VGA BIOS ---> | |
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| | Display ---> | |
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| | PXE ROM ---> | |
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| | Generic Drivers ---> | |
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| | Console ---> | |
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| | [ ] Relocatable Modules | |
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| | System tables ---> | |
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| | Payload ---> | |
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| | Debugging ---> | |
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| | --- | |
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| +----v(+)-------------------------------------------------------------+ |
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+-------------------------------------------------------------------------+
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| <Select> < Exit > < Help > |
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+-------------------------------------------------------------------------
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\end{verbatim}
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}
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Select Mainboard -$>$ Mainboard Vendor -$>$ AMD
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-$>$ Mainboard Model -$>$ Olive Hill
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Then save, exit and run make.
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{ \small
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\begin{verbatim}
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$ make
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\end{verbatim}
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}
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The built image, coreboot.rom, is located at folder build.
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\section{Programming coreboot to flash memory}
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The image resulting from a coreboot build can be directly programmed to
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a flash device, either using an external flash programmers, e.g., Dediprog SF100, or by using the
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Linux flash utility, flashrom.
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\subsection{Add modules and payload}
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\subsubsection{VGA BIOS}
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There is a big Chance that you need to get a VGA BIOS.
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{ \small
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\begin{verbatim}
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.config - coreboot v4.0 Configuration
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------------------------------------------------------------------------------
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+-------------------------------- VGA BIOS --------------------------------+
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| Arrow keys navigate the menu. <Enter> selects submenus --->. |
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| Highlighted letters are hotkeys. Pressing <Y> includes, <N> excludes, |
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| <M> modularizes features. Press <Esc><Esc> to exit, <?> for Help, </> |
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| for Search. Legend: [*] built-in [ ] excluded <M> module < > module |
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| +----------------------------------------------------------------------+ |
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| | [*] Add a VGA BIOS image | |
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| | (vgabios.bin) VGA BIOS path and filename | |
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| | (1002,1306) VGA device PCI IDs | |
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| +----------------------------------------------------------------------+ |
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+--------------------------------------------------------------------------+
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| <Select> < Exit > < Help > |
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+--------------------------------------------------------------------------+
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\end{verbatim}
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}
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Select VGA BIOS. ``The VGA device PCI IDs'' should be the same as your device. Get the
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Option ROM from Vendor's website.
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\subsubsection{Payload}
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coreboot in itself is "only" minimal code for initializing a mainboard
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with peripherals. After the initialization, it jumps to a payload.
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Currently, SeaBIOS is the most widely used payload. The best way to integrate SeaBIOS
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is setting it in menuconfig.
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{ \small
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\begin{verbatim}
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+------------------------------- Payload ---------------------------------+
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| Arrow keys navigate the menu. <Enter> selects submenus --->. |
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| Highlighted letters are hotkeys. Pressing <Y> includes, <N> excludes, |
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| <M> modularizes features. Press <Esc><Esc> to exit, <?> for Help, </> |
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| for Search. Legend: [*] built-in [ ] excluded <M> module < > module |
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| +----------------------------------------------------------------------+ |
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| | Add a payload (SeaBIOS) ---> | |
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| | SeaBIOS version (1.7.2.1) ---> | |
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| | [*] Use LZMA compression for payloads (NEW) | |
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| +----------------------------------------------------------------------+ |
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+--------------------------------------------------------------------------+
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| <Select> < Exit > < Help > |
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+--------------------------------------------------------------------------+
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\end{verbatim}
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The script in Makefile will automatically checkout, config, build the SeaBIOS source,
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and integrat the binary into the final image.
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%
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% Working with Git
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%
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\section{Working with Git}
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\subsection{Configuration of Git}
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Inside the checkout you should install a commit-msg hook that adds a
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Change-Id into commit messages, which uniquely identifies the logical
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change in Gerrit even across multiple iterations of the commit. The
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hook only needs to be installed once per clone, and installation can
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be done with:
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{ \small
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\begin{verbatim}
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$ cd coreboot
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$ cp ./util/gitconfig/* .git/hooks
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\end{verbatim}
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}
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configure your name and email in git.
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{ \small
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\begin{verbatim}
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$ git config --global user.name "Your Name Comes Here"
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$ git config --global user.email your.email@example.com'
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\end{verbatim}
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}
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The name~\ref{user name} and email~\ref{Contact Information} should be the same the settings in gerrit.
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Otherwise you can not push you code to community.
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Then run the following command once, to tell git that by default you
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want to submit all commits in the currently checked-out branch for
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review on gerrit:
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{ \small
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\begin{verbatim}
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$ git config remote.origin.push HEAD:refs/for/master
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\end{verbatim}
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}
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The above configurations for git has been integrated into Makefile. You can run
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{ \small
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\begin{verbatim}
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$ make gitconfig
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\end{verbatim}
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}
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\subsection{Work flow}
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It is recommended that you make a new branch when you start to work, not pushing changes to master.
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{ \small
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\begin{verbatim}
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$ git checkout master -b mybranch
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\end{verbatim}
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}
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After you have done your changes, run:
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{ \small
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\begin{verbatim}
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$ git add file_need_to_submit.c
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$ git commit -m "my first change."
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\end{verbatim}
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}
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% Does anyone have a better word to describe the phylosophy of spliting changes to patches?
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You need to realize that the changes you have made should be well devided into
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several commits. Each of them has one and only one meaning. You could use git rebase -i to
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split, squash, remove, rewrite you comment.
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Here is an example of a well-formatted commit message:
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{ \small
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\begin{verbatim}
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examplecomponent: Refactor duplicated setup into a function
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Setting up the demo device correctly requires the exact same register
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values to be written into each of the PCI device functions. Moving the
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writes into a function allows also otherexamplecomponent to use them.
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Signed-off-by: Joe Hacker <joe@hacker.email>
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\end{verbatim}
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}
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Then you can push the code.
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{ \small
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\begin{verbatim}
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$ git push
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\end{verbatim}
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}
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You can go to the ~\ref{sec:gerrit} gerrit to see if your changes is successfully pushed.
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Often it might happen that the patch you sent for approval is not good
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enough from the first attempt. Gerrit and git make it easy to track
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patch evolution during the review process until patches meet our
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quality standards and are ready for approval.
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You can easily modify a patch sent to gerrit by you or even by someone
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else. Just apply it locally using one of the possible ways to do it,
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make a new local commit that fixes the issues reported by the
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reviewers, then rebase the change by preserving the same Change-ID. We
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recommend you to use the git rebase command in interactive mode,
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Once your patch gets a +2 comment, your patch can be merged (cherry-pick, actually) to origin/master.
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%
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% Working with Gerrit
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%
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\section{Working with Gerrit}
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\label{sec:gerrit}
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If you are a coreboot user, not planning to contribute, you can skip this section.
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\subsection{Get gerrit account}
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You need to get an OpenID first. Currently Google account give you an OpenID. It means, if you have a gmail account, you have an OpenID. You can try to signed in.
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click \url{https://review.coreboot.org}
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%\includegraphics[width=6.00in,height=1.00in]{gerrit_signin.png}
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{ \small
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\begin{verbatim}
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+-----------------------------------------------------------+
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|All Projects Documentation Register Sign In |
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|Open Merged Abandoned |
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|Search for status:open |
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+-----------------------------------------------------------+
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|Subject Status Owner Project Branch Updated CR V |
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|cpu: Rename.. Alexandru coreboot master 1:20 PM +1 |
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|cpu: Only a.. Alexandru coreboot master 1:17 PM X |
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|arch/x86: D.. Alexandru coreboot master 1:09 PM |
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| |
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| Next -> |
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|Press '?' to view keyboard shortcuts | Powered by Gerrit |
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+-----------------------------------------------------------+
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\end{verbatim}
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}
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Click ``Sign In'', You will get
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%\includegraphics[width=6.00in,height=4.00in]{openid.png}
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You will be redirected to Google to get logging in.
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% \includegraphics[width=6.00in,height=1.50in]{login.png}
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{ \small
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\begin{verbatim}
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Sign In to Gerrit Code Review at review.coreboot.org
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+--------------------------------------------------+
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+--------------------------------------------------+
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[] Remember me
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Sign In Cancel
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Sign in with a Google Account
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Sign in with a Yahoo! ID
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What is OpenID?
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OpenID provides secure single-sign-on, without revealing your passwords to this website.
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There are many OpenID providers available. You may already be member of one!
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Get OpenID
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\end{verbatim}
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}
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\subsection{Configure account}
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Click the dropdown button near the user name and click ``Settings''
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% \includegraphics[width=6.00in,height=4.00in]{settings}
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% \epsfig{figure=keystroke_left}
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% \epstopdf {file=settings.eps}
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% \epsfig{file=settings.eps}
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\label{user name} In ``profile'' section, type the user name for git. This probably can be changed only once.
|
|
{ \small
|
|
\begin{verbatim}
|
|
Profile Username zbao
|
|
Preferences Full Name Zheng Bao
|
|
Watched Projects Email Address zheng.bao@amd.com
|
|
Contact Information Registered Jun 28, 2011 4:33 PM
|
|
SSH Public Keys Account ID 1000034
|
|
HTTP Password
|
|
Identities
|
|
Groups
|
|
\end{verbatim}
|
|
}
|
|
|
|
\label{Contact Information} In ``Contact Information'', enter you full name and your Email, which should be configured in your .gitconfig
|
|
{ \small
|
|
\begin{verbatim}
|
|
Full Name __________________________________
|
|
Preferred Email ______________ Registered Email
|
|
|
|
Save Changes
|
|
\end{verbatim}
|
|
}
|
|
|
|
In ``SSH Public Keys'' section, upload your public key.
|
|
{ \small
|
|
\begin{verbatim}
|
|
Status Algorithm Key Comment
|
|
|
|
Delete
|
|
Add SSH Public Key
|
|
> How to Generate an SSH Key
|
|
+--------------------------+
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
+--------------------------+
|
|
clear Add Close
|
|
\end{verbatim}
|
|
}
|
|
|
|
Click ``Add Key ...''
|
|
Go back to you linux command line and type:
|
|
{ \small
|
|
\begin{verbatim}
|
|
$ ssh-keygen
|
|
Generating public/private rsa key pair.
|
|
Enter file in which to save the key (/home/zhengbao/.ssh/id_rsa):
|
|
Enter passphrase (empty for no passphrase):
|
|
Enter same passphrase again:
|
|
Your identification has been saved in /home/zhengbao/.ssh/id_rsa.
|
|
Your public key has been saved in /home/zhengbao/.ssh/id_rsa.pub.
|
|
The key fingerprint is:
|
|
xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx zhengb@host.domain
|
|
The key's randomart image is:
|
|
+--[ RSA 2048]----+
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
| |
|
|
+-----------------+
|
|
\end{verbatim}
|
|
}
|
|
The data in ~/.ssh/id\_rsa.pub is your public key. Copy them to the box in the page of ``SSH Public Keys'' and click add.
|
|
|
|
In ``HTTP Password'' section, click button ``Generate Password''. You will get the password for http checkout.
|
|
{ \small
|
|
\begin{verbatim}
|
|
Username XXX
|
|
Password XXXXXXXXXXXX
|
|
|
|
Generate Password Clear Password
|
|
|
|
\end{verbatim}
|
|
}
|
|
|
|
\subsection{Reviewing Changes}
|
|
For each listed changes in Gerrit, you can review, comment, evaluate,
|
|
cherry-pick, and even re-submit them. For you own patches, only you can
|
|
abandon them. Click in the file and commit message, you can add in-line comment.
|
|
|
|
%
|
|
% 14 Glossary
|
|
%
|
|
|
|
\section{Glossary}
|
|
\begin{itemize}
|
|
\item payload
|
|
|
|
coreboot only cares about low level 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.
|
|
|
|
\item Gerrit
|
|
|
|
Gerrit is a web based code review system, facilitating online code
|
|
reviews for projects using the Git version control system.
|
|
|
|
Gerrit makes reviews easier by showing changes in a side-by-side
|
|
display, and allowing inline comments to be added by any reviewer.
|
|
|
|
Gerrit simplifies Git based project maintainership by permitting any
|
|
authorized user to submit changes to the master Git repository, rather
|
|
than requiring all approved changes to be merged in by hand by the
|
|
project maintainer. This functionality enables a more centralized
|
|
usage of Git.
|
|
|
|
\end{itemize}
|
|
|
|
\newpage
|
|
|
|
%
|
|
% 14 Bibliography
|
|
%
|
|
|
|
\section{Bibliography}
|
|
\subsection{Additional Papers on coreboot}
|
|
|
|
\begin{itemize}
|
|
\item
|
|
\textit{\url{https://www.coreboot.org/Documentation}}
|
|
\end{itemize}
|
|
|
|
\subsection {Links}
|
|
|
|
\begin{itemize}
|
|
\item Etherboot: \textit{\url{http://www.etherboot.org/}}
|
|
\item OpenBIOS: \textit{\url{http://www.openbios.org/}}
|
|
\item Flashrom: \textit{\url{http://www.flashrom.org/}}
|
|
\item Seabios: \textit{\url{http://www.seabios.org/}}
|
|
\end{itemize}
|
|
|
|
|
|
\end{document}
|