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mission:tech:odyssey:sku:software [2012-02-18 18:16] – created chronomission:tech:odyssey:sku:software [2013-06-05 14:34] (current) – external edit 127.0.0.1
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 +====== Off-Board build-environment for ARM ======
 +
 +To compile your own image you have to build a toolchain able to produce binary files that can run on the Netus G20. It's powered by a ARM926EJ-S™ ARM® Thumb® Processor, which means that you have to prepare a (cross)compiler for ARMV5TE architecture. Although it's possible to compile a lot of packages on the SKU itself, it's far more convenient and faster to compile the packages on a more powerful system
 +
 +===== Prepare HBT-Environment =====
 +
 +To improve structure and reduce the risk of of //contaminating// the host with wrong arch builds 3 environments will be created, a bit like a matroska doll.
 +
 +  * The Host
 +  * The Build container
 +  * The Target container
 +
 +[[http://gcc.gnu.org/onlinedocs/gcc-4.5.1/gcc/ARM-Options.html#ARM-Options|GCC 4.5.1 ARM Options]]
 +
 +==== Base Structure ====
 +
 +<code bash>
 +mkdir -p /vault/virtual/icaros/base
 +</code>
 +
 +It's recommended to use a 64 bit version, when your host is running on 64bit.
 +
 +<code bash>
 +cd /vault/virtual/icaros/base
 +wget http://ftp.uni-erlangen.de/pub/mirrors/gentoo/releases/amd64/current-stage3/stage3-amd64-20101118.tar.bz2
 +wget http://ftp.uni-erlangen.de/pub/mirrors/gentoo/snapshots/portage-latest.tar.bz2
 +</code>
 +
 +create support scripts:
 +\\ 
 +
 +The $BEROOT variable:
 +
 +<code bash>
 +export BEROOT=/vault/virtual/icaros/armv5te-softfloat-linux-gnueabi/
 +</code>
 +
 +==== Create a new Build-Environment container ====
 +
 +From here on you should be able to use copy&paste
 +
 +<code bash>
 +mkdir $BEROOT
 +cd $BEROOT
 +cp $BEROOT/../base/stage3-amd64-20101118.tar.bz2 $BEROOT
 +cp $BEROOT/../base/portage-latest.tar.bz2 $BEROOT
 +tar xfjpv stage3-amd64-20101118.tar.bz2 -C $BEROOT
 +tar xfvj portage-latest.tar.bz2 -C $BEROOT/usr
 +</code>
 +
 +little helper to easily enter the build-env in the future
 +
 +<code>
 +vi $BEROOT/bin/chroot-setup
 +</code>
 +
 +<code bash>
 +#!/bin/bash
 +echo "Setting up BE-ROOT environment"
 +env-update && source /etc/profile
 +export SYSROOT="/usr/armv5te-softfloat-linux-gnueabi"
 +cd $HOME
 +exec /bin/bash
 +</code>
 +
 +Change the permission to make it execuatble
 +
 +<code>chmod 0700 $BEROOT/bin/chroot-setup</code>
 +
 +for more comfort your can change your bash prompt to see that you're chrooted
 +
 +<code bash>
 +echo "export PS1=\"\[\033[01;31m\][BE-CHROOT]\[\033[01;34m\] \W $\[\033[00m\] \"" >> $BEROOT/etc/bash/bashrc
 +</code>
 +
 +your gentoo base system is now almost ready to enter
 +
 +<code bash>
 +cp -L /etc/resolv.conf $BEROOT/etc/
 +mount -t proc proc $BEROOT/proc
 +mount -o rbind /dev $BEROOT/dev
 +</code>
 +
 +===chroot===
 +
 +<code bash>
 +chroot ${EGROOT} /bin/chroot-setup
 +</code>
 +
 +=== Update & Preparation of the Build-Environment ===
 +
 +<code bash>emerge --sync</code>
 +
 +Prepare the make.conf of the build-environment
 +
 +<code bash>
 +CFLAGS="-O2 -pipe"
 +CXXFLAGS="${CFLAGS}"
 +CHOST="x86_64-pc-linux-gnu"
 +MAKEOPTS="-j6"
 +
 +USE=""
 +
 +GENTOO_MIRRORS="http://ftp.uni-erlangen.de/pub/mirrors/gentoo \
 +                http://linux.rz.ruhr-uni-bochum.de/download/gentoo-mirror"
 +
 +PORTDIR_OVERLAY=/usr/local/portage
 +</code>
 +
 +Create the local portage overlay
 +
 +<code bash>
 +mkdir /usr/local/portage
 +mkdir /etc/portage
 +</code>
 +
 +
 +=== emerge crossdev ===
 +
 +setting up portage to choose latest crossdev
 +
 +<code>
 +nano /etc/portage/package.keywords
 +</code>
 +
 +content 
 +
 +<code>
 +sys-devel/crossdev **
 +</code>
 +
 +
 +Finally emerge the crossdev tools
 +
 +<code bash>emerge -av portage-utils crossdev dev-embedded/u-boot-tools</code>
 +
 +=== build crossdev chain ===
 +
 +Now it's start to set up the toolchain
 +
 +USE=-* crossdev -t armv5tejl-softfloat-linux-gnueabi
 +
 +The above didnt work in any combination, changing the target to
 +armv5te-softfloat-linux-gnueabi however worked with default values like a charm. Need to test if the compiled code will work in the AT91 and if there are other complications.
 +
 +<code>
 +crossdev -v -t armv5te-softfloat-linux-gnueabi
 +</code>
 +
 +
 +
 +The output will hopefully look similar to this:
 +
 +<code bash>
 + * crossdev version:      @CDEVPV@
 + * Host Portage ARCH:     amd64
 + * Target Portage ARCH:   arm
 + * Target System:         armv5te-softfloat-linux-gnueabi
 + * Stage:                 4 (C/C++ compiler)
 +
 + * binutils:              binutils-[latest]
 + * gcc:                   gcc-[latest]
 + * headers:               linux-headers-[latest]
 + * libc:                  glibc-[latest]
 +
 + * PORTDIR_OVERLAY:       /usr/local/portage
 + * PORT_LOGDIR:           /var/log/portage
 + * PORTAGE_CONFIGROOT:    
 +
 + * Forcing the latest versions of {binutils,gcc}-config/gnuconfig ...   [ ok ]
 + * Emerging cross-binutils ...                                          [ ok ]
 + * Emerging cross-linux-headers-quick ...                               [ ok ]
 + * Emerging cross-glibc-headers ...                                     [ ok ]
 + * Emerging cross-gcc-stage1 ...                                        [ ok ]
 + * Emerging cross-linux-headers ...                                     [ ok ]
 + * Emerging cross-glibc ...                                             [ ok ]
 + * Emerging cross-gcc-stage2 ...                                        [ ok ]
 +</code>
 +
 +At this point the cross toolchain is successfully installed, usually you can proceed without the next step but better to be safe than sorry, check if the toolchain works, simply launch: 
 +
 +<code bash>
 +[EG-CHROOT] ~ $ armv5te-softfloat-linux-gnueabi-gcc --version
 +armv5te-softfloat-linux-gnueabi-gcc (Gentoo 4.5.1-r1 p1.3, pie-0.4.5) 4.5.1
 +Copyright (C) 2010 Free Software Foundation, Inc.
 +This is free software; see the source for copying conditions.  There is NO
 +warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 +
 +</code>
 +
 +==== set up the target infrastructure ====
 +
 +Next set up the target infrastructure
 +
 +<code bash>
 +mkdir ${SYSROOT}/etc
 +cp /etc/make.globals "${SYSROOT}/etc"
 +mkdir -p "${SYSROOT}/etc/portage/profile"
 +</code>
 +
 +
 +Prepare the make.conf of the target-environment
 +
 +<code>
 +nano ${SYSROOT}/etc/make.conf
 +</code>
 +
 +<code bash>
 +#
 +# make.conf for Netus G20 ARM Embedded System
 +#
 +
 +CHOST=armv5tejl-softfloat-linux-gnueabi
 +CBUILD=i686-pc-linux-gnu
 +ROOT=/usr/local/${CHOST}/
 +ARCH="arm"
 +
 +MAKEOPTS="-j8"
 +ACCEPT_KEYWORDS="~x86 arm ~arm"
 +CFLAGS="-Os -pipe -march=armv5t -mtune=arm926ej-s -fomit-frame-pointer -I${ROOT}/usr/include/ -I${ROOT}/include/"
 +CXXFLAGS="${CFLAGS}"
 +LDFLAGS="-L${ROOT}/usr/lib -L${ROOT}/lib"
 +
 +
 +USE="${ARCH} zlib bindist make-symlinks minimal"
 +
 +
 +PKG_CONFIG_PATH="${ROOT}/usr/lib/pkgconfig/"
 +FEATURES="-collision-protect sandbox buildpkg noman noinfo nodoc"
 +PORTDIR_OVERLAY="/usr/local/portage"
 +PKGDIR=${ROOT}/packages/
 +PORTAGE_TMPDIR=${ROOT}/tmp/
 +PORTAGE_WORKDIR_MODE=2775
 +PORTAGE_ECLASS_WARNING_ENABLE=0
 +CLEAN_DELAY=0
 +EPAUSE_IGNORE=1
 +EBEEP_IGNORE=1
 +
 +GENTOO_MIRRORS="http://ftp.uni-erlangen.de/pub/mirrors/gentoo \
 +                http://linux.rz.ruhr-uni-bochum.de/download/gentoo-mirror"
 +
 +VIDEO_CARDS=""
 +INPUT_DEVICES=""
 +</code>
 +
 +original:
 +
 +lrwxrwxrwx 1 root root 30 Nov 22 08:18 /usr/armv5te-softfloat-linux-gnueabi/etc/make.profile -> /usr/portage/profiles/embedded
 +
 +
 +<code>
 +ln -s /usr/portage/profiles/default/linux/arm/10.0/ "${SYSROOT}/etc/make.profile"
 +</code>
 +
 +
 +xkmake: A cross kernel make wrapper
 +
 +<code>
 +nano /bin/xkmake 
 +</code>
 +
 +
 +<code bash>
 +#!/bin/sh
 +exec make ARCH="arm" CROSS_COMPILE="armv5te-softfloat-linux-gnueabi-" INSTALL_MOD_PATH="${SYSROOT}" "$@"
 +</code>
 +
 +=== Kernel ===
 +
 +<code>
 +USE="-* minimal unicode" armv5te-softfloat-linux-gnueabi-emerge -pv gentoo-sources
 +</code>
 +
 +
 +
 +<code bash>
 +cd /usr/armv5te-softfloat-linux-gnueabi/usr/src/linux
 +wget http://www.acmesystems.it/foxg20/download/linux/linux-2.6.35.4-foxg20-patches
 +</code>
 +
 +<code bash>
 +patch -p1 < linux-2.6.35.4-foxg20-patches
 +
 +patching file arch/arm/mach-at91/board-foxg20.c
 +patching file arch/arm/mach-at91/Kconfig
 +patching file arch/arm/mach-at91/Makefile
 +</code>
 +
 +Download example Kernel configuration file:
 +
 +<code bash>
 +$ wget http://www.acmesystems.it/foxg20/download/linux/linux-2.6.35.4-foxg20-config
 +$ mv linux-2.6.35.4-foxg20-config .config
 +</code>
 +
 +Download the **makefile** (with minus m) useful to simplify the compiling command:
 +
 +<code bash>
 +$ wget http://www.acmesystems.it/foxg20/download/linux/linux-2.6.35.4-foxg20-makefile
 +$ mv linux-2.6.35.4-foxg20-makefile makefile
 +</code>
 +
 +
 +to get pps working
 +
 +<code>
 +Device drivers -> PPS support
 +* Enable high-resolution timestamps
 +* Enable 'ktimer' and 'line discipline' as modules
 +</code>
 +
 +otherwise ldattach: cannot set line discipline: Invalid argument
 +
 +=== create sd card ===
 +
 +tune2fs -c 0 -i 0 /dev/xyz
 +
 +
 +Why not jffs2 or ubifs
 +
 +What about file systems like jffs2 and ubifs, which are aware of flash card wearing?
 +SD cards, according to SanDisk specs, should have wear leveling logic, which controls the number of writes and remaps blocks as needed. Wear-aware file systems might actually play against the logic of the card and are usually not recommendable.
 +
 +==== Software ====
 +
 +gpsd-2.95
 +
 +before emerging chrony:
 +
 +<code>
 +cd /usr/include/
 +wget "http://gitweb.enneenne.com/?p=pps-tools;a=blob_plain;f=timepps.h;h=d2628d2d061ea2a3623e57990d9ada62623773cf;hb=master" -O timepps.h
 +cd /usr/include/linux
 +wget http://projects.qi-hardware.com/index.php/p/qi-kernel/source/file/jz-2.6.35/include/linux/pps.h
 +
 +</code>
 +
 +chrony-1.24
 +
 +setserial
 +
 +<code>
 +localhost ~ # setserial /dev/ttyS1 low_latency
 +localhost ~ # ldattach 18 /dev/ttyS1 
 +[  419.370000] new PPS source atmel_serial1 at ID 0
 +[  419.370000] PPS source #0 "/dev/ttyS1" added
 +</code>
 +
 +{{tag>odyssey sku arm software development linux gentoo netus}}
  
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