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Base: Alpine for Raspberry Pi https://alpinelinux.org/downloads/

https://wiki.alpinelinux.org/wiki/Raspberry_Pi

cd AlpineLinux
curl -LO http://dl-cdn.alpinelinux.org/alpine/v3.7/releases/armhf/alpine-rpi-3.7.0-armhf.tar.gz
git clone https://github.com/RPi-Distro/firmware-nonfree.git
git clone https://github.com/OpenELEC/misc-firmware.git
echo 'enable_uart=1' > usercfg.txt
cd ..

SDHC

sudo mkfs.vfat /dev/mmcblk0p1

mount

DISK=/media/stephane/????-????
# The sources are in ./AlpineLinux/
cd ./AlpineLinux/
tar xzvf alpine-rpi-3.6.2-armhf.tar.gz -C $DISK/
cp usercfg.txt $DISK/
BRCM=$DISK/firmware/brcm
mkdir -p $BRCM
cp firmware-nonfree/brcm80211/brcm/brcmfmac43430-sdio.* $BRCM/
cp misc-firmware/firmware/brcm/BCM43430A1.hcd $BRCM
sync

umount

Plug in raspi Login as root (no password) Plug network cable in Plug keyboard

setup-alpine -e (all defaults, except 1 for dl-cdn; this means chronyd and openssh) lbu commit lbu commit -d reboot

adduser builder # with password, will use `su` to get root
# Note that /home/builder is not saved by lbu
passwd # set a password for root, so that builder can su

SSH_AUTH_SOCK= ssh -p 22 [email protected]
su
lbu commit -d # etc…

apk update apk upgrade

apk add nodejs git gpsd

Persistent storage

mount /media/mmcblk0p1 -o rw,remount
sed -i 's/vfat ro,/vfat rw,/' /etc/fstab
dd if=/dev/zero of=/media/mmcblk0p1/persist.img bs=1024 count=0 seek=1048576
apk add e2fsprogs
mkfs.ext4 /media/mmcblk0p1/persist.img
echo '/media/mmcblk0p1/persist.img /media/persist ext4 rw,relatime,errors=remount-ro 0 0' >> /etc/fstab
mkdir /media/persist
mount -a
mkdir /media/persist/usr
mkdir /media/persist/.work
echo 'overlay /usr overlay lowerdir=/usr,upperdir=/media/persist/usr,workdir=/media/persist/.work 0 0' >> /etc/fstab
mount -a

echo 'export NODE_PATH=/usr/lib/node_modules' >> /etc/profile

rc-update add swclock boot # enable the software clock
rc-update del hwclock boot # disable the hardware clock
lbu commit -d
reboot

The content of the FAT32 is at /media/mmcblk0p1

https://wiki.alpinelinux.org/wiki/Raspberry_Pi_3_-_Setting_Up_Bluetooth https://wiki.alpinelinux.org/wiki/Raspberry_Pi_3_-_Configuring_it_as_wireless_access_point_-AP_Mode

Master

apk add hostapd dnsmasq
cat > /etc/hostapd/hostapd.conf <<'EOF'
interface=wlan0
driver=nl80211
ssid=Pi3-AP
hw_mode=g
channel=1
macaddr_acl=0
auth_algs=1
wpa=2
wpa_key_mgmt=WPA-PSK
wpa_passphrase=raspberry
rsn_pairwise=CCMP
wpa_pairwise=CCMP
EOF
cat > /etc/dnsmasq.conf <<'EOF'
interface=wlan0
dhcp-range=10.0.0.2,10.0.0.5,255.255.255.0,12h
EOF
cat > /etc/network/interfaces <<'EOF'
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
  hostname rpi-master
auto wlan0
iface wlan0 inet static
  address 10.0.0.1
  netmask 255.255.255.0
EOF

service dnsmasq start
service hostapd start

rc-update add dnsmasq
rc-update add hostapd

lbu ci -d
reboot

Client

https://wiki.debian.org/WiFi/HowToUse#WPA-PSK_and_WPA2-PSK

apk add wpa_supplicant
wpa_passphrase Pi3-AP raspberry > /etc/wpa_supplicant/wpa_supplicant.conf
cat > /etc/network/interfaces <<'EOF'
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
  hostname rpi-client
auto wlan0
iface wlan0 inet dhcp
  wpa-ssid Pi3-AP
EOF

service wpa_supplicant start
rc-update add wpa_supplicant

Note: wpa-supplicant starts late, so the WLAN interface will not have its IP address ready right away.

GPSD

apk add gpsd

This is some initial configuration to make sure that GPSD receives the messages from the USB port:

cat > /etc/conf.d/gpsd <<'EOF'
DEVICE="/dev/ttyUSB0"
BAUDRATE="115200"
ARGS="-n "
/bin/stty -F ${DEVICE} ${BAUDRATE}
# /bin/setserial ${DEVICE} low_latency
EOF

service gpsd start

rc-update add gpsd
lbu ci -d

nc localhost 2947 ?WATCH={"enable":true,"json":true};

However the final configuration (using brave-chin) will require GPSD to use

cat > /etc/conf.d/gpsd <<'EOF'
# GPSD will connect to brave-chin on port 5050
DEVICE="udp://127.0.0.1:5050"
ARGS="-n "
EOF

Raspi tools

apk add raspberrypi # https://pkgs.alpinelinux.org/contents?branch=v3.6&name=raspberrypi&arch=armhf&repo=main

/opt/vc/bin/tvservice -o # power off HDMI

Turn off the LED

echo gpio > /sys/class/leds/led1/trigger echo 0 > /sys/class/leds/led1/brightness

GPIO

npm install wiring-pi (to be tested)