Table of Contents
Intel Edison
By default the Edison board uses Yocto Linux which really doesn't interest me. I'm not into this Arduino stuff, I normally write direct in C and don't want to have some kind of pre-build Linux.
So,the best way would be to put Gentoo Linux on the Edison (which I'm also using for lots of ARM boards).
I keep things short here for now. The Edison has an integrated eMMC and it's not that easy to write/partition it. Normally I've a removable SD-Card which I attach to my PC, create the partitions, compile u-boot, write u-boot, format partitions, build Gentoo, put Gentoo on root, build Kernel and finally put Kernel on /boot and insert the SD-Card to the board.
Access to the integrated eMMC is possible via DFU which makes things difficult. Another way would be an boot-able SD-Card. Problem for me, my break-out-board ( Intel® Edison and Mini Breakout Kit) has no external MMC-Card and I don't want to solder anything at this point.
Then I found ubilinux where you can download some scripts and a prebuild Ubuntu-like image. The image (*.ext4) can be mounted via '-o loop' and that's where I started. The most important part is to keep your gentoo as small as possible. A good way is to put portage into a squashfs image and so I came up with a 800MB gentoo.
More or less I did these things:
- create a new directory for your Gentoo-root:
mkdir gentoo_root
- download and extract i686-stage3
#check http://distfiles.gentoo.org/releases/x86/autobuilds/ for latest filename wget http://distfiles.gentoo.org/releases/x86/autobuilds/current-stage3-i686/stage3-i686-20150303.tar.bz2 tar -vjxf *.tar.bz2 -C gentoo_root
- change make.conf
# These settings were set by the catalyst build script that automatically # built this stage. # Please consult /usr/share/portage/config/make.conf.example for a more # detailed example. CHOST="i686-pc-linux-gnu" CFLAGS="-march=i686 -mtune=atom -O2 -fomit-frame-pointer -pipe" CXXFLAGS="${CFLAGS}" # WARNING: Changing your CHOST is not something that should be done lightly. # Please consult http://www.gentoo.org/doc/en/change-chost.xml before changing. CHOST="i686-pc-linux-gnu" # These are the USE flags that were used in addition to what is provided by the # profile used for building. USE="-X -alsa -ipv6 -doc -debug -gdbm -gmp mmx wifi bindist -systemd -nls -berkdb" FEATURES="buildpkg" PYTHON_TARGETS="python2_7" USE_PYTHON="2.7" PORTDIR="/usr/portage" DISTDIR="${PORTDIR}/distfiles" - compile everything you need, also do
emerge --update --newuse --deep --with-bdeps=y @world emerge --depclean
- prepare portage for squashfs (we'll use a compressed portage, which is only about 90MB:
#create links for writeable folders rm -rf /usr/portage/distfiles rm -rf /usr/portage/packages ln -fs /mnt/root/usr/portage/packages /usr/portage/packages ln -fs /mnt/root/usr/portage/distfiles /usr/portage/distfiles #compress portage mksquashfs /usr/portage/ portage.squash -noappend -e /usr/portage/packages/ -e /usr/portage/distfiles/ #remove portage rm -rf /usr/portage* #create rw-folders mkdir /usr/portage/packages mkdir /usr/portage/distfiles
- download ubilinux
wget http://www.emutexlabs.com/files/ubilinux/ubilinux_0.9_quark-live_usb_install.zip unzip ubilinux_0.9_quark-live_usb_install.zip
- create copy for new gentoo image:
mkdir toFlash/ext4_img cp -r toFlash toFlash_gentoo
- mount image files, we need the original to copy some files later on
mount toFlash/edison-image-edison.ext4 toFlash/ext4_img -o loop mount toFlash_gentoo/edison-image-edison.ext4 toFlash_gentoo/ext4_img -o loop
- update ext4-image content:
rsync -av --delete gentoo_root/ toFlash_gentoo/ext4_img/
- copy important stuff from old ext4-image to loop_mountpoint
cp toFlash/ext4_img/boot toFlash_gentoo/ext4_img/boot cp toFlash/ext4_img/lib/firmware toFlash_gentoo/ext4_img/lib/firmware cp toFlash/ext4_img/etc/modprobe.d/ toFlash_gentoo/ext4_img/etc/modprobe.d/ echo -e '#!/bin/sh\n\necho 1 >/sys/devices/virtual/misc/watchdog/disable\n" > toFlash_gentoo/ext4_img/etc/local.d/no_watchdog.start echo -e 'chmod +x toFlash_gentoo/ext4_img/etc/local.d/no_watchdog.start' >> toFlash_gentoo/ext4_img/etc/local.d/no_watchdog.start #set a password passwd
- update modules
chroot toFlash_gentoo/ext4_img/ depmod -a exit
- add agetty for serial interface (toFlash_gentoo/ext4_img/etc/inittab)
# SERIAL CONSOLES #s0:12345:respawn:/sbin/agetty 38400 ttyS0 vt100 #s1:12345:respawn:/sbin/agetty 9600 ttyS1 vt100 s0:12345:respawn:/sbin/agetty 115200 ttyMFD2 vt100
- unmount image and check for errors
unmount toFlash/ext4_img unmount toFlash_gentoo/ext4_img e2fsck -f toFlash_gentoo/edison-image-edison.ext4
- flash gentoo (see ubilinux for details)
cd toFlash_gentoo/ ./flashall.sh
As an alternative you could simply use my ext4 image and replace the one from ubilinux. The flashing takes quite a while, about 1h for me.
Misc
For wifi you should probably create a config-file for the mac on the board:
Eddi ~ # cat /config/wifi/mac.txt 02:00:86:db:6e:54
For portage on the board, you've to do some mounts (requires kernel with squashfs support):
mkdir /mnt/root mount /dev/mmcblk0p8 /mnt/root mount /portage.squash /usr/portage
Bigger root
Eddi ~ # parted /dev/mmcblk0 GNU Parted 3.2 Using /dev/mmcblk0 Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) unit B del 10 del 9 resize 8 3909074431 q Eddi ~ # resize2fs /dev/mmcblk0p8 resize2fs 1.42.12 (29-Aug-2014) Filesystem at /dev/mmcblk0p8 is mounted on /; on-line resizing required old_desc_blocks = 1, new_desc_blocks = 1 The filesystem on /dev/mmcblk0p8 is now 937979 (4k) blocks long. Eddi ~ # df Filesystem 1K-blocks Used Available Use% Mounted on /dev/root 3481284 765668 2533436 24% / devtmpfs 10240 0 10240 0% /dev tmpfs 98408 416 97992 1% /run cgroup_root 10240 0 10240 0% /sys/fs/cgroup shm 492024 0 492024 0% /dev/shm
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