https://wiki.gentoo.org/index.php?title=BeagleBone_Black


CrossCompile doc :
http://www.gentoo.org/proj/en/base/embedded/handbook/?part=1&chap=2

(https://wiki.projectmeshnet.org/Install_on_BeagleBone_Black)
CFLAGS="-O2 -march=armv7-a -mtune=cortex-a8 -mfpu=neon -ftree-vectorize -ffast-math -mfloat-abi=hard -marm -Wno-error=maybe-uninitialized"
LDFLAGS="-O2 -march=armv7-a -mtune=cortex-a8 -mfpu=neon -ftree-vectorize -ffast-math -mfloat-abi=hard -marm -Wno-error=maybe-uninitialized"

http://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html


(http://osdir.com/ml/beagleboard/2013-09/msg00300.html)
...
The make.conf for cross-compiling is:

#
# /home/beagle/etc/portage/make.conf.cross
#
CFLAGS="-O2 -pipe -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=hard --sysroot=/home/beagle"
CXXFLAGS="${CFLAGS}"
CHOST="armv7-none-linux-gnueabi"
# --as-needed must be set separately
# Builds sysroot-ng correctly.
#LDFLAGS="--sysroot=/home/beagle -Wl,--as-needed -Wl,-O1,--sysroot=/home/beagle -L/usr/lib"
# Builds most packages correctly.
LDFLAGS="--sysroot=/home/beagle -Wl,--as-needed -Wl,-O1,--sysroot=/home/beagle -L/home/beagle/usr/lib"
#
INSTALL_MASK="*.la"
# Additional USE flags.
USE="arm bindist make-symlinks minimal X zlib -doc -ipv6"
#
# Emerge environment.
ACCEPT_KEYWORDS="arm"
PKG_CONFIG_SYSROOT_DIR=/home/beagle
PKG_CONFIG_ALLOW_SYSTEM_LIBS=1
PKG_CONFIG_LIBDIR=/home/beagle/usr/lib/pkgconfig
PKG_CONFIG_PATH=/home/beagle/usr/lib/pkgconfig:/home/beagle/usr/share/pkgconfig
#
PORTDIR="/usr/portage"
DISTDIR="/usr/portage/distfiles"
PORTDIR_OVERLAY="/home/beagle/usr/local/portage ${PORTDIR_OVERLAY}"
PORT_LOGDIR="/home/beagle/var/log/devel"
#
PORTAGE_ELOG_CLASSES="info warn error log"
PORTAGE_ELOG_SYSTEM="save"
#
VIDEO_CARDS="dummy fbdev omapfb vesa"
INPUT_DEVICES="evdev keyboard mouse"
#
# eof
#

USE="-fortran" crossdev -v -S --g 4.7.2 -t armv7-none-linux-gnueabi --env \
'EXTRA_ECONF="--with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float-abi=hard \
libc_cv_forced_unwind=yes libc_cv_ctors_header=yes libc_cv_c_cleanup=yes"'



wget ftp://ftp.denx.de/pub/u-boot/u-boot-latest.tar.bz2
tar -xjf u-boot-latest.tar.bz2

?cd into u-boot directory
?make tools-only
?sudo install tools/mkimage /usr/local/bin

lzop nécessaire pour la compression du kernel

? git clone git://github.com/beagleboard/kernel.git
git clone https://github.com/beagleboard/linux.git
git checkout 3.14

?? ./patch.sh

La config : https://github.com/beagleboard/linux/tree/3.14/arch/arm/configs

Spécifier le fichier dans le make ?
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- beaglebone_defconfig -j


http://wiki.beyondlogic.org/index.php/BeagleBoneBlack_Building_Kernel
http://elinux.org/Building_BBB_Kernel

How to connect to the BeagleBone via mini-USB
# modprobe ftdi_sio vendor=0x0403 product=0xa6d0
# screen /dev/ttyUSB1 115200 # (or USB0)

udev rules :
https://forums.gentoo.org/viewtopic-t-963014-start-0.html

voir Raspberry pi :
(http://wiki.gentoo.org/wiki/Raspberry_Pi)

root # make ARCH=arm bcmrpi_defconfig
root # make ARCH=arm CROSS_COMPILE=/usr/bin/armv6j-hardfloat-linux-gnueabi- oldconfig
root # make ARCH=arm CROSS_COMPILE=/usr/bin/armv6j-hardfloat-linux-gnueabi- -j2
root # make ARCH=arm CROSS_COMPILE=/usr/bin/armv6j-hardfloat-linux-gnueabi- modules_install INSTALL_MOD_PATH=/mnt/raspberrypiroot/