Classic install or sys mode on Raspberry Pi

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Howto for classic installation or "sys mode"

This method works with a desktop PC under Ubuntu and other linuxes

Download archive of Alpinelinux for Rasperry Pi : http://dl-cdn.alpinelinux.org/alpine/v3.6/releases/armhf/alpine-rpi-3.6.2-armhf.tar.gz

On a class 10 sd-card of size of 16Go or more, create 2 partitions :

First in fat16 with size of 128Ko. Check boot and lba flags
Second in ext4 with the remaining place

Eject and insert your SD-card to recognize all the partitions

Now go inside the first partition (fat16) Untar the archive with tar: tar zxvf ~/Download/alpine-rpi-3.6.2-armhf.tar.gz Because a bug, it's recommended to add in the partition a file named usercfg.txt with the unique line : enable_uart=1

Eject properly the sd card, insert it in the Raspberry Pi, plug a usb keyboard, an HDMI and a network cables, and power on. As a prompt is displaying, connect as root without password. So, execute the following command :

setup-alpine (set the mapping keyboard, the timezone, how to connect to the network (dhcp is the better method), say "no" at "save config" and cache)
apk update
apk add chrony (Raspberry Pi has no battery for his clock. So, synchro with a ntp server)
service chronyd restart
mount /dev/mmcblk2p2 /mnt (The second partition in ext4 format where Alpinuxlinux is installing in sys mode)
setup -m sys /mnt
mount -o remount,rw /dev/mmcblk0p1 (An update in the first partition is required for the next reboot)
rm -f /media/mmcblk0p1/boot/* (clean up the boot folder in the first partition to drop unused files)
cd /mnt (We are in the second partition)
rm boot/boot (Drop the useful symbolink link)
mv boot/* /media/mmcblk0p1/boot/ (Move the image and init ram for AlpineLinux at the good place)
rm -Rf boot
mkdir media/mmcblk1p1 (It's the mount point for the first partition on the next reboot)
ln -s media/mmcblkp1/boot boot (Don't worry about the error)
echo "/dev/mmcblk0p1 /media/mmcblk0p1 vfat defaults 0 0" >> etc/fstab (Update /etc/fstab)
sed -i '/cdrom/d' etc/fstab (Of course, you don't have any cdrom or floppy on the Raspberry Pi)
sed -i '/floppy/d' etc/fstab
sed -i '/edge/s/^#//' etc/apk/repositories (Enable the repository for the community if you want vim, mc, php, apache, nginx, ...)
cd /media/mmcblk0p1
sed -i 's/^/root=\/dev\/mmcblk0p2 /' cmdline.txt (Tell for the next boot that the root filesystem is on the second partition)
reboot

That works on Raspberry Pi 3B and 1B. But if you have the 1B version, let's be very, very patient (several tens of minutes)