How to pre-configure rasberry image for swedish wifi and enable ssh

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Category: Blog

Published: Saturday, 06 February 2021 15:54

Written by Lars Berntzon

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This will setup a raspian image to be used with a swedish wifi and ssh enabled. Done in linux.

Prologue:

• Map the partitions from the image with:
      kpartx -a <name-of-unpacked-raspian-image>.img
• Run losetup to see which loop device was used. Lets say it was loop4 in this case
• Mount the root partition of the image (second partition) under /mnt:
     sudo mount /dev/mapper/loop4p2 /mnt

Wifi:

• Create the file /mnt/etc/wpa_supplicant/wpa_supplicant.conf  with following content:

  ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
  update_config=1
  country=SE
  network={
          ssid="<your-wifi-ssid>"
          psk="<your-wifi-password>"
  }

• Replace the '1' to a '0' i all files /mnt/var/lib/systemd/rfkill/platform-*

Enable ssh daemon:

Either do:

• ln -s /lib/systemd/system/ssh.service /mnt/etc/systemd/system/
• ln -s /lib/systemd/system/ssh.service /mnt/etc/systemd/system/multi-user.target.wants/

Or mount the boot partition and touch a file named "ssh" in that directory.

Epilogue:

• Run: umount /mnt
• Drop the devicemapper mappings:
      kpartx -d <name-of-unpacked-raspian-image>.img

Now your image file should be ready to write to a MicroSD card and the raspberry should boot up directly to the wifi network with ssh enabled.

Extra stuff

Enable camera:

• Run the kpartx and mount /dev/mapper/loop4p1 instead as /mnt
• Add following files to the "[all]" section of /mnt/config.txt:

  start_x=1
  gpu_mem=128

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