Installation on an External Storage

Flashing image

The flashing procedure described below is the default procedure for downloading Clea OS image onto a uSD card, an USB device or another generic external storage.

Linux OS

Device flash using bmap-tools

Once the image has been built, the output files are located in: build_<board>/tmp/deploy/images/seco-<cpu>-<board>/.

The essential files for flashing a complete image are:

• The compressed wic image: seco-image-clea-os-seco-<cpu>-<board>-<build_date>.rootfs.wic.bz2
• The bmap file: seco-image-clea-os-seco-<cpu>-<board>-<build_date>.rootfs.wic.bmap

To flash a storage device (e.g. uSD):

Install bmap-tools utility:

    $ sudo apt install bmap-tools

Get the storage device name that need to be flashed under /dev path

    $ ls /dev

info

Please, be careful to select the correct device ID. Using an incorrect device identifier may cause data loss on other devices. A bootable microSD or USB can usually be identified as /dev/sdX.

Flash the image by using bmap-tools

    $ sudo bmaptool copy --bmap seco-image-clea-os-seco-<cpu>-<board>-<build_date>.rootfs.wic.bmap seco-image-clea-os-seco-<cpu>-<board>-<build_date>.rootfs.wic.bz2 /dev/sdX

Device flash using dd

To flash the image on the device using the dd command, the .wic image has to be available, so uncompress it if necessary.

The dd command write sequential data, so it's usually slower than bmap-tools; the command should be available by default on most Linux distros. Note that the downloaded .bz2 file needs to be extracted beforehand Nomenclature assumptions are the same used in the previous paragraph

    $ bunzip2 seco-image-clea-os-seco-<cpu>-<board>-<build_date>.rootfs.wic.bz2
    $ sudo dd if=seco-image-clea-os-seco-<cpu>-<board>-<build_date>.rootfs.wic of=/dev/sdX status=progress conv=fsync