.. _update-files:

Updating Files
==============

.. note:: You have different options updating files on the module's partition(s).

USB Mass Storage
----------------

You can use the ``ums`` command in U-Boot to turn the module into a USB
mass storage device and copy the file on the host PC into the mounted, e.g.
*boot* partition of the module.

.. prompt::
   :prompts: U-Boot>

   ums 0 mmc 0

On your host computer:

.. prompt::
   :prompts: $

   sudo mount /dev/disk/by-partlabel/boot /mnt
   sudo cp a-nice-devicetree.dtb /mnt
   sudo umount /mnt

Don't forget to unmount it before terminating the 'ums' command.

.. prompt::
   :prompts: U-Boot>

   <CTRL-C>


Serial Port
-----------

You may also use the ``loady`` command in U-Boot to transfer a file via
serial port.

.. prompt::
   :prompts: U-Boot>

   loady ${fdtaddr}

Now start the **[xyz]modem** download from your terminal program.

When the file is transferred, you can save it:

.. prompt::
   :prompts: U-Boot>

   save mmc 0 ${loadaddr} /${fdt_file} ${filesize}


UUU way
-------

You can also use :ref:`uuu` to install individual files on the module with the
following commands in your **uuu script file**:

.. code-block:: text
   :linenos:

   [...]
   FB: ucmd setenv fastboot_buffer ${loadaddr}
   FB: download -f a-nice-devicetree.dtb
   FB: ucmd save mmc 0 ${fastboot_buffer} a-nice-devicetree.dtb ${fastboot_bytes}