OpenWrt for Arduino Yun cheat sheet: Difference between revisions

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When Build succeed. You find '''openwrt-ar71xx-generic-yun-16M-squashfs-sysupgrade.bin''' in ./bin/ar71xx directory.
When Build succeed. You find '''openwrt-ar71xx-generic-yun-16M-squashfs-sysupgrade.bin''' in ./bin/ar71xx directory.


In order to using the packages, You must placed kernel and arduino packages to server.
In order to using the packages, You must placed kernel and arduino packages to server. Change opkg configuration file.
  ./bin/ar71xx/packages/kernel
  ./bin/ar71xx/packages/kernel
  ./bin/ar71xx/packages/arduino
  ./bin/ar71xx/packages/arduino

Revision as of 14:13, 25 March 2016

OpenWrt running on Atheros AR9331 of Arduino Yun, LLC edition OpenWrt-Yun also Linino, is in obsolete (and has security issues) at kernel and various packages. I will try to investigate the upgrade to the latest version of OpenWrt. (With Absolutely NO Warranty)


Prepare for the Security update of OpenWrt-Yun, Arduino Yun Operating System (YunOS). In the IoT ERA, I think it is a very important thing.

OpenWrt-Yun Chaos Calmer 15.05

RedSnake64's implementation found at Arduino Yun forum.

RedSnake64 edition OpenWrt-Yun: 

https://github.com/RedSnake64/openwrt-yun/tree/15.05
ChaosCalmer_v1.3
I tried it. 'mDNS' is not active, so I could not be accessed in '.local'.
opkg install avahi-nodbus-daemon
Grasp that implementation. I decided to make Arduino Yun package that can be used in OpenWrt trunk Bleeding Edge.

Investigate the Yun Profile of Origin OpenWrt

The OpenWrt Project, already there is a Arduino Yun Profile. 

target/linux/ar71xx/generic/profiles/arduino.mk
ar71xx: add Arduino Yun

https://github.com/openwrt/packages/tree/master/utils/yunbridge
yunbridge
Arduino Yun bridge library has been implemented.

OpenWrt snapshot images: 

https://downloads.openwrt.org/snapshots/trunk/ar71xx/generic/
https://downloads.openwrt.org/snapshots/trunk/ar71xx/generic/packages/
openwrt-ar71xx-generic-yun-16M-squashfs-sysupgrade.bin
This System Image is corresponding Arduino Yun Hardware. but, of course Arduino Yun own software is not implemented.
Mirror site: http://ftp.stw-bonn.de/pub/openwrt/snapshots/trunk/ar71xx/generic/

OpenWrt Core: 

git.openwrt.org Git - openwrt trunk tree
shortlog

OpenWrt Packages: 

https://github.com/openwrt/packages
https://github.com/openwrt/luci
https://github.com/openwrt-routing/packages
https://github.com/openwrt/telephony
https://github.com/openwrt/targets
https://github.com/openwrt-management/packages
Optional package of OpenWrt Project is managed on github.

Investigate the OpenWrt-Yun

OpenWrt-Yun arduino packages

LLC edition arduino package: 

https://github.com/arduino/openwrt-packages-yun/tree/master/arduino

RedSnake64 edition arduino package: 

https://github.com/RedSnake64/openwrt-arduino-packages/tree/for-15.05

Arduino OpenWrt Yún packages: 

(y) avrdude *
(y) cpu-mcu-bridge *
(m) cwiid *
(y) luci-app-arduino-webpanel
(m) node *
(m) node-bleno
(m) node-noble
(m) node-serialport *
(m) node-socket.io
(m) node-socket.io-legacy *
(m) node-socket.io-client
(m) node-socket.io-client-legacy *
(m) node-sqlite3
(m) node-ws
(y) rng-tools *
(y) spacebrew
(y) temboo
(y) uSDaemon
(m) v8m-rb
(y) yun-conf
(y) yun-scripts
  1. avrdude: use a OpenWrt package. Configuration for the Arduino Yun should be placed in /etc/avrdude.conf.
  2. cpu-mcu-bridge: overlaps with OpenWrt yunbridge package. For compatibility use a Arduino package.
  3. cwiid: only RedSnake64 edition. cwiid is Nintendo Wii remote interface package, so should delete.
  4. node: use a OpenWrt package.
  5. node-serialport: use a OpenWrt package.
  6. "-legacy" mean that the 0.9.x version.
  7. rng-tools: OpenWrt package has a problem. Should be changed START=98 to START=48.

My new arduino package here: 

https://github.com/nxhack/openwrt-arduino-packages

OpenWrt-Yun build memo

LLC edition OpenWrt-Yun: 

git clone --depth=1 --branch master --single-branch https://github.com/arduino/openwrt-yun.git

RedSnake64 edition OpenWrt-Yun: 

git clone --depth=1 --branch 15.05 --single-branch https://github.com/RedSnake64/openwrt-yun.git

In reference to the LLC edition and RedSnake64 edition, to enable build the upstream of trunk / Bleeding Edge.

Origin OpenWrt: 

git clone --depth=1 https://git.openwrt.org/openwrt.git

Preparation for cross-compiling environment in Ubuntu 14.04. 

apt-get update
apt-get install -y git subversion build-essential asciidoc \
	fastjar flex gawk libgtk2.0-dev intltool zlib1g-dev \
	genisoimage libncurses5-dev libssl-dev ruby sdcc unzip \
	bison libboost-dev libxml-parser-perl libusb-dev bin86 \
	bcc sharutils openjdk-7-jdk mercurial cvs bzr \
	nodejs-legacy curl g++-multilib squashfs-tools
It also puts squashfs-tools for the validation of the build Image. (unsquashfs openwrt-ar71xx-generic-yun-16M-squashfs-sysupgrade.bin)
Installing Node.js via package manager | Node.js
Do not use the Ubuntu nodejs, npm packages, Use nodejs.org installer.

./feeds.conf: 

src-git packages https://github.com/openwrt/packages.git
src-git luci https://github.com/openwrt/luci.git
src-git routing https://github.com/openwrt-routing/packages.git
src-git telephony https://github.com/openwrt/telephony.git
src-git management https://github.com/openwrt-management/packages.git
src-git targets https://github.com/openwrt/targets.git
#src-git oldpackages http://git.openwrt.org/packages.git
#src-svn xwrt http://x-wrt.googlecode.com/svn/trunk/package
#src-svn phone svn://svn.openwrt.org/openwrt/feeds/phone
#src-svn efl svn://svn.openwrt.org/openwrt/feeds/efl
#src-svn xorg svn://svn.openwrt.org/openwrt/feeds/xorg
#src-svn desktop svn://svn.openwrt.org/openwrt/feeds/desktop
#src-svn xfce svn://svn.openwrt.org/openwrt/feeds/xfce
#src-svn lxde svn://svn.openwrt.org/openwrt/feeds/lxde
#src-link custom /usr/src/openwrt/custom-feed
#src-git arduino https://github.com/RedSnake64/openwrt-arduino-packages.git;for-15.05
src-git arduino https://github.com/nxhack/openwrt-arduino-packages.git;for-trunk

./build.sh: 

#!/bin/bash -ex

#FEEDS
./scripts/feeds uninstall -a
rm -rf feeds
./scripts/feeds update -a
./scripts/feeds install -a

#PATCH SOME PACKAGES
sed -i -e s/^START=98/START=48/ ./feeds/packages/utils/rng-tools/files/rngd.init

#COPY CONFIG FILE
mv .config .config.$$
cp openwrt-yun-minimum.config .config

make oldconfig
make
Note: Various OpenWrt packages are broken.

As reference linino: 

https://github.com/linino/linino_distro/tree/lininoIO
https://github.com/linino/linino_CC/tree/avr

Important concept of OpenWrt

The Minimized (smaller footprint) is Highest Priority. This is the large difference in policy between PC GNU/Linux and OpenWrt.

Trunk Bleeding Edge version of OpenWrt-Yun package and build environment

https://git.openwrt.org/?p=openwrt.git
https://github.com/nxhack/openwrt-yun-build-extra
https://github.com/nxhack/openwrt-arduino-packages

Setup Repos: 

mkdir Build_Path_Some_Where
cd Build_Path_Some_Where
git clone --depth=1 https://git.openwrt.org/openwrt.git
git clone --depth=1 --branch master --single-branch https://github.com/nxhack/openwrt-yun-build-extra.git
cd openwrt
ln -s ../openwrt-yun-build-extra/* .

Please modify ./files/etc/opkg/distfeeds.conf

First Time, Setup cross compile build environment (ubuntu 14.04): 

./FIRST_SETUP_ubuntu_Trusty_Tahr.sh

Build: 

./build.sh

When Build succeed. You find openwrt-ar71xx-generic-yun-16M-squashfs-sysupgrade.bin in ./bin/ar71xx directory.

In order to using the packages, You must placed kernel and arduino packages to server. Change opkg configuration file. 

./bin/ar71xx/packages/kernel
./bin/ar71xx/packages/arduino

Essential items in the kernel configuration

CONFIG_TARGET_ar71xx=y
CONFIG_TARGET_ar71xx_generic=y
CONFIG_TARGET_ar71xx_generic_Yun=y

CONFIG_IMAGEOPT=y
# CONFIG_PREINITOPT is not set
CONFIG_TARGET_PREINIT_SUPPRESS_STDERR=y
CONFIG_TARGET_PREINIT_TIMEOUT=2
# CONFIG_TARGET_PREINIT_SHOW_NETMSG is not set
# CONFIG_TARGET_PREINIT_SUPPRESS_FAILSAFE_NETMSG is not set
CONFIG_TARGET_PREINIT_IFNAME=""
CONFIG_TARGET_PREINIT_IP="192.168.1.1"
CONFIG_TARGET_PREINIT_NETMASK="255.255.255.0"
CONFIG_TARGET_PREINIT_BROADCAST="192.168.1.255"
# CONFIG_INITOPT is not set
CONFIG_TARGET_INIT_PATH="/usr/sbin:/usr/bin:/sbin:/bin"
CONFIG_TARGET_INIT_ENV=""
CONFIG_TARGET_INIT_CMD="/sbin/init"
CONFIG_TARGET_INIT_SUPPRESS_STDERR=y
CONFIG_VERSIONOPT=y
CONFIG_VERSION_DIST="OpenWrt"
CONFIG_VERSION_NICK="Bleeding Edge"
CONFIG_VERSION_NUMBER=""
CONFIG_VERSION_REPO="http://downloads.openwrt.org/snapshots/trunk/%S/packages"
CONFIG_VERSION_MANUFACTURER="Arduino"
CONFIG_VERSION_MANUFACTURER_URL=""
CONFIG_VERSION_PRODUCT="Arduino Yun"
CONFIG_VERSION_HWREV="1.0"
# CONFIG_VERSION_FILENAMES is not set

CONFIG_PER_FEED_REPO=y
CONFIG_PER_FEED_REPO_ADD_DISABLED=y
CONFIG_PER_FEED_REPO_ADD_COMMENTED=y
CONFIG_FEED_packages=y
CONFIG_FEED_luci=y
CONFIG_FEED_routing=y
CONFIG_FEED_telephony=y
CONFIG_FEED_management=y
CONFIG_FEED_targets=y
CONFIG_FEED_arduino=y
# CONFIG_SMIMEOPT is not set
CONFIG_OPKGSMIME_PASSPHRASE=y

CONFIG_DEFAULT_base-files=y
CONFIG_DEFAULT_busybox=y
CONFIG_DEFAULT_dnsmasq=y
CONFIG_DEFAULT_dropbear=y
CONFIG_DEFAULT_firewall=y
CONFIG_DEFAULT_fstools=y
CONFIG_DEFAULT_ip6tables=y
CONFIG_DEFAULT_iptables=y
CONFIG_DEFAULT_iwinfo=y
CONFIG_DEFAULT_kmod-ath9k=y
CONFIG_DEFAULT_kmod-gpio-button-hotplug=y
CONFIG_DEFAULT_kmod-usb-core=y
CONFIG_DEFAULT_kmod-usb2=y
CONFIG_DEFAULT_libc=y
CONFIG_DEFAULT_libgcc=y
CONFIG_DEFAULT_mtd=y
CONFIG_DEFAULT_netifd=y
CONFIG_DEFAULT_odhcp6c=y
CONFIG_DEFAULT_odhcpd=y
CONFIG_DEFAULT_opkg=y
CONFIG_DEFAULT_ppp=y
CONFIG_DEFAULT_ppp-mod-pppoe=y
CONFIG_DEFAULT_swconfig=y
CONFIG_DEFAULT_uboot-envtools=y
CONFIG_DEFAULT_uci=y
CONFIG_DEFAULT_uclient-fetch=y
CONFIG_DEFAULT_wpad-mini=y

CONFIG_PACKAGE_python-base=y
CONFIG_PACKAGE_python-light=y

CONFIG_PACKAGE_avrdude=y
CONFIG_PACKAGE_cpu-mcu-bridge=y
CONFIG_PACKAGE_luci-app-arduino-webpanel=y
CONFIG_PACKAGE_node=m
CONFIG_PACKAGE_node-bleno=m
CONFIG_PACKAGE_node-noble=m
# CONFIG_PACKAGE_node-serialport is not set
CONFIG_PACKAGE_node-socket.io=m
CONFIG_PACKAGE_node-socket.io-client=m
CONFIG_PACKAGE_node-socket.io-client-legacy=m
CONFIG_PACKAGE_node-socket.io-legacy=m
CONFIG_PACKAGE_node-sqlite3=m
CONFIG_PACKAGE_node-ws=m
CONFIG_PACKAGE_rng-tools=y
CONFIG_PACKAGE_spacebrew=y
CONFIG_PACKAGE_temboo=y
CONFIG_PACKAGE_uSDaemon=y
CONFIG_PACKAGE_v8m-rb=m
CONFIG_PACKAGE_yun-conf=y
CONFIG_PACKAGE_yun-scripts=y

CONFIG_PACKAGE_luci=y
CONFIG_PACKAGE_luci-base=y
CONFIG_LUCI_LANG_en=y
CONFIG_PACKAGE_luci-mod-admin-full=y
CONFIG_PACKAGE_luci-app-arduino-webpanel=y
CONFIG_PACKAGE_luci-app-firewall=y
CONFIG_PACKAGE_luci-theme-bootstrap=y
CONFIG_PACKAGE_luci-theme-openwrt=y
CONFIG_PACKAGE_luci-proto-ipv6=y
CONFIG_PACKAGE_luci-proto-ppp=y
CONFIG_PACKAGE_luci-lib-ip=y
CONFIG_PACKAGE_luci-lib-json=y
CONFIG_PACKAGE_luci-lib-jsonc=y
CONFIG_PACKAGE_luci-lib-nixio=y
CONFIG_PACKAGE_luci-i18n-base-en=y
CONFIG_PACKAGE_luci-i18n-firewall-en=y

CONFIG_PACKAGE_kmod-nls-base=y
CONFIG_PACKAGE_kmod-nls-cp437=y
CONFIG_PACKAGE_kmod-nls-iso8859-1=y
CONFIG_PACKAGE_kmod-nls-utf8=y

# CONFIG_PACKAGE_triggerhappy is not set
CONFIG_PACKAGE_kmod-gpio-button-hotplug=y
CONFIG_PACKAGE_kmod-input-core=m
CONFIG_PACKAGE_kmod-input-evdev=m
CONFIG_PACKAGE_kmod-input-gpio-encoder=m
CONFIG_PACKAGE_kmod-input-gpio-keys=m
CONFIG_PACKAGE_kmod-input-gpio-keys-polled=m
CONFIG_PACKAGE_kmod-input-joydev=m
CONFIG_PACKAGE_kmod-input-matrixkmap=m
CONFIG_PACKAGE_kmod-input-polldev=m
CONFIG_PACKAGE_kmod-input-uinput=m

# CONFIG_PACKAGE_odhcp6c is not set
# CONFIG_PACKAGE_odhcpd is not set
# CONFIG_PACKAGE_dnsmasq is not set
CONFIG_PACKAGE_dnsmasq-dhcpv6=y

# CONFIG_PACKAGE_libavahi-client is not set
# CONFIG_PACKAGE_libavahi-compat-libdnssd is not set
# CONFIG_PACKAGE_libavahi-dbus-support is not set
CONFIG_PACKAGE_libavahi-nodbus-support=y

# CONFIG_PACKAGE_avahi-autoipd is not set
# CONFIG_PACKAGE_avahi-daemon-service-http is not set
# CONFIG_PACKAGE_avahi-daemon-service-ssh is not set
# CONFIG_PACKAGE_avahi-dbus-daemon is not set
CONFIG_PACKAGE_avahi-dnsconfd=y
CONFIG_PACKAGE_avahi-nodbus-daemon=y

CONFIG_PACKAGE_gnupg=y
CONFIG_PACKAGE_libgpg-error=y

CONFIG_PACKAGE_nano=y
CONFIG_PACKAGE_curl=y
CONFIG_PACKAGE_wget=y

openwrt-yun-minimum.config

Difference between the LLC edition

IPv6 stack is enabled.

Device name of the leds has been changed.
ds:green:wlan -> arduino:blue:wlan
ds:green:usb -> arduino:white:usb
target/linux/ar71xx/base-files/etc/uci-defaults/01_leds
https://github.com/nxhack/openwrt-arduino-packages/commit/eb7130ac331ce491765f27372d987d9d7415f6c0

In the original rng-tools has a problem. Should match the init script of the LLC version.
Should be started before the Yun original startup script "S49generate_new_gpg_key".
S98rngd -> S48rngd : START=98 -> START=48

 sed -i -e s/^START=98/START=48/ ./feeds/packages/utils/rng-tools/files/rngd.init

BUSYBOX ASH BANNER The date disappear.
https://git.openwrt.org/?p=openwrt.git;a=commit;h=39fabb5068e95ab9c0901dd4f37129111d88ae00

+# don't create a version string containing the actual timestamp
+export KCONFIG_NOTIMESTAMP=1
+

BUSYBOX ASH HELP Banner disappear.
CONFIG_ASH_HELP The default has been changed to 'n'.
https://github.com/openwrt/openwrt/blob/master/package/utils/busybox/Config-defaults.in#L2617

Add a configuration of the AR9331 as AVR writer to the original package.
/etc/avrdude.conf

/etc/avrdude.conf: 

programmer
  id    = "linuxgpio";
  desc  = "Use the Linux sysfs interface to bitbang GPIO lines";
  type  = "linuxgpio";
  reset = ~18;
  sck   = 11;
  mosi  = 27;
  miso  = 8;
;

BUSYBOX: telnet, stty is disabled.
opkg install coreutils-stty
stty -icanon -echo; nc localhost 6571

PATH has changed.
CONFIG_TARGET_INIT_PATH="/bin:/sbin:/usr/bin:/usr/sbin" to CONFIG_TARGET_INIT_PATH="/usr/sbin:/usr/bin:/sbin:/bin"

uhttpd: SSL is forced.
option redirect_https '1'
/etc/config/uhttpd

uhttpd: Use URL alias handle. Do not apply alias patch.
/etc/config/uhttpd
Add to /etc/config/uhttpd
	list alias '/arduino=/cgi-bin/luci'
	list alias '/data=/cgi-bin/luci'
	list alias '/mailbox=/cgi-bin/luci'

Procd button mechanism exists. triggerhappy is not required.
(triggerhappy use HID button mechanism, It depends kmod-input-*)
(kmod-gpio-button-hotplug + procd buttons, Of course, smaller footprint)
I was send PR, adding ath79_register_gpio_keys_polled.
https://git.openwrt.org/?p=openwrt.git;a=commit;h=10ae130265302c717b1580514ada28d9a48a2484
/etc/hotplug.d/button/00-button
/etc/config/system
Add button section to /etc/config/system.
config button
        option button 'wps'
        option action 'pressed'
        option handler '/usr/bin/wifi-reset-button-pressed'

config button
        option button 'wps'
        option action 'released'
        option handler '/usr/bin/wifi-reset-button-released'

TO DO

  1. uboot-linino コンパイルエラーとる
    extern inline -> static inline, extern __inline__ -> static __inline__
    ブートローダの書き換え失敗したら完全に文鎮になるので検証はこわくてできない。
  2. DISTRIB_TAINTS 意味調査
    ./include/version.mk 確認する。OpenWrt snapshot では、最終的に DISTRIB_TAINTS="" である。
  3. SD card の automount 方法調査する。(uSDaemon がいまいちすぎるので)
    OpenWrt (e)udev まだ試していないが。
    /etc/udev/rules.d/11-sd-cards-auto-mount.rules
    KERNEL!="sda[0-9]", GOTO="sd_cards_auto_mount_end"
# Global mount options
ACTION=="add", ENV{mount_options}="relatime"
# Filesystem specific options
ACTION=="add", IMPORT{program}="/sbin/blkid -o udev -p %N"
ACTION=="add", ENV{ID_FS_TYPE}=="vfat|ntfs", ENV{mount_options}="$env{mount_options},utf8,gid=100,umask=002"
ACTION=="add", RUN+="/bin/mkdir -p /mnt/%k", RUN+="/bin/mount -o $env{mount_options} /dev/%k /media/%k"
ACTION=="remove", RUN+="/bin/umount -l /mnt/%k", RUN+="/bin/rmdir /mnt/%k"
# exit
LABEL="sd_cards_auto_mount_end"

    udevadm control --reload-rules
    なるほど、(e)udev を使わないのはサイズの問題だね。system image はできるだけ小さくするのが最優先になっている。なのでこの実装はしない。
  4. opkg packages
    procps -> procps-ng procps-ng-ps procps-ng-w procps-ng-top
    CPU Usage がバグってる様子...
    mg, logrotate がないので作った。
    python-pip があった
  5. local build packages の BUILD_KEY (Local build key)
    /etc/opkg/keys/ にストアされる。
    まちがって $(TOPDIR)/key-build と $(TOPDIR)/key-build.pub を消して再生成してしまったら、 その環境で作った opkg パッケージを、System Image に組み込まれ(build-in)てる opkg と入れ替える。
    $(CP) $(BUILD_KEY).pub $(1)/etc/opkg/keys/`$(STAGING_DIR_HOST)/bin/usign -F -p $(BUILD_KEY).pub`
  6. fstools, block-mount, fstab
    https://wiki.openwrt.org/doc/uci/fstab
    Sun Mar  6 19:54:35 2016 user.notice : this file has been obsoleted. please call "/sbin/block mount" directly
Sun Mar  6 19:54:36 2016 daemon.err block: /dev/sda2 is already mounted
    block-mount は /etc/config/fstab に automount って書けば boot 時によしなに mount するようだ。hotplug 的な挙動はまだこれからっぽい。
    block info and DISK_MEDIA_CHANGE events
    メディア挿入後 /sbin/block mount ってやればよいのだが、とりあえず今は uSDaemon は有効にする。
  7. extroot
    https://wiki.openwrt.org/doc/howto/extroot
    この作業を前提でパーティションとフォーマット済みのメディアがあるとして、
    cd /mnt/sda2
rm -rf *
rm -rf .??*
cd /
tar -C /overlay -cvf - . | tar -C /mnt/sda2 -xf -
block detect > /etc/config/fstab ; vi /etc/config/fstab
# edit /etc/config/fstab : Set all enabled '0' → enabled '1'
#      option target '/mnt/sda2' ->  option target '/overlay'
reboot
    戻す場合は、poweroff して SD card を取り出し 'YUN RST' を押し再起動。その後 /etc/config/fstab を修正。
    config global 'automount'
	option from_fstab '1'
	option anon_mount '1'
  8. /etc/opkg.conf と /etc/opkg/distfeeds.conf の切り分けを調査する。
    なんか変なメッセージがでたので根元の　distfeeds.conf を書き換えたのだが、opkg.conf をユーザが書き換えるのが本筋。調査する。
    • opkg_conf_parse_file: Duplicate src declaration
    https://wiki.openwrt.org/doc/techref/opkg
    https://wiki.openwrt.org/doc/packages
    仕様がまだ定まってないようだ。
  9. OOM
    (もちろん extroot 環境で)
    python supervisor + beaver とかうごかすと OOM が発生する。
    メモリー減らすために、いらないモジュールがあるか再調査する。
    IPv6 support はさすがにこのご時世外せない。
    odhcpd はなくても大丈夫だった。そのかわりdnsmasq を dnsmasq-dhcpv6 に置き換える。
    dbus はなくても大丈夫だった。avahi を nodbus で。
    echo -1000 > /proc/`cat /var/run/dropbear.1.pid`/oom_score_adj
sysctl -w vm.swappiness=0
sysctl -w kernel.panic_on_oops=1
sysctl -w kernel.panic=3
    python supervisor + beaver の条件下で opkg でも Out of memory のエラー
    /etc/opkg/distfeeds.conf で本当に必要なレポジトリのみにする。
    /etc/opkg.conf の lists_dir ext /var/opkg-lists を tmpfs 以外の場所にする ex. lists_dir ext /usr/local/var/opkg-lists
    /etc/opkg.conf に option force_space を追加する
    lists_dir ext /usr/local/var/opkg-lists
option tmp_dir /usr/local/var/tmp
option force_space
    とにかく /tmp や /var (/tmp の symlink) には物を置かない事。これ大事。

memo

refresh fstab : uci

uci delete fstab.@mount[0]
uci delete fstab.@mount[0]
uci commit

uci set fstab.automount=global
uci set fstab.automount.from_fstab='1'
uci set fstab.automount.anon_mount='1'
uci commit

extroot

cd /mnt/sda2
rm -rf *
rm -rf .??*
cd /
tar -C /overlay -cvf - . | tar -C /mnt/sda2 -xf -
block detect > /etc/config/fstab ; vi /etc/config/fstab
# edit /etc/config/fstab : Set all enabled '0' → enabled '1'
#      option target '/mnt/sda2' ->  option target '/overlay'
reboot

basic tools setup : opkg

# edit /etc/opkg.conf for extroot
opkg update
opkg list-upgradable
opkg install ca-certificates
opkg install unzip
opkg install screen
opkg install procps-ng procps-ng-ps procps-ng-w procps-ng-vmstat procps-ng-watch
opkg install procps-ng-top --force-overwrite
opkg install coreutils-ls coreutils-stty
opkg install dropbearconvert
opkg install e2fsprogs mkdosfs fdisk dosfsck
opkg install rsync
opkg install diffutils
opkg install logrotate
opkg install mg
opkg install openssh-client --force-overwrite
procps-ng has bug, CPU usage fail.
mkdir -p -m 1777 /usr/local/var/tmp
export TMPDIR=/usr/local/var/tmp
opkg install python-pip
opkg install python-six
# Edit /etc/pip.conf
#   cache-dir=/usr/local/var/tmp/.cache
# pip install --upgrade pip
pip install beaver==36.1.0
pip install supervisor
If OOM occurs, re-run pip.

dosfsck

cd /
umount /mnt/sda1
dosfsck -t -a -w /dev/sda1
# dosfsck -t -a /dev/sda1
mount /dev/sda1 /mnt/sda1

drop caches

echo 3 > /proc/sys/vm/drop_caches

Bricked

My Yún doesn't boot anymore! How can I restore it?

YunSerialTerminal をロードしてシリアルコンソールを有効にする。SDカードは抜いておく事。YUN RST ボタンをおす。

  1. YunSerialTerminal で prompt が出て OS の操作ができる場合。
    1. なんとかして network を生かす。 
      ifconfig インターフェース IPアドレス
route add default gw どこか
      /etc/resolv.conf を編集。
    2. SD card で正常な sysupgrade のイメージをもってくる。 
      mkdir /mnt/sda1
mount -t vfat /dev/sda1 /mnt/sda1
  2. YunSerialTerminal で u-boot を操作できる場合。
    1. https://www.arduino.cc/en/Tutorial/YunUBootReflash
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