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4.3 KiB
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193 lines
4.3 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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.. Copyright 2022, Heinrich Schuchardt <xypron.glpk@gmx.de>
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source command
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==============
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Synopsis
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--------
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::
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source [<addr>][:[<image>]|#[<config>]]
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Description
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-----------
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The *source* command is used to execute a script file from memory.
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Two formats for script files exist:
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* legacy U-Boot image format
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* Flat Image Tree (FIT)
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The benefit of the FIT images is that they can be signed and verifed as
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described in :doc:`../fit/signature`.
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Both formats can be created with the mkimage tool.
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addr
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location of the script file in memory, defaults to CONFIG_SYS_LOAD_ADDR.
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image
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name of an image in a FIT file
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config
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name of a configuration in a FIT file. A hash sign following white space
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starts a comment. Hence, if no *addr* is specified, the hash sign has to be
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escaped with a backslash or the argument must be quoted.
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If both *image* and *config* are omitted, the default configuration is used, or
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if no configuration is defined, the default image.
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Examples
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--------
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FIT image
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'''''''''
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For creating a FIT image an image tree source file (\*.its) is needed. Here is
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an example (source.its).
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.. code-block::
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/dts-v1/;
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/ {
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description = "FIT image to test the source command";
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#address-cells = <1>;
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images {
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default = "script-1";
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script-1 {
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data = "echo 1";
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type = "script";
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compression = "none";
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};
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script-2 {
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data = "echo 2";
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type = "script";
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compression = "none";
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};
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};
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configurations {
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default = "conf-2";
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conf-1 {
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script = "script-1";
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};
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conf-2 {
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script = "script-2";
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};
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};
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};
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The FIT image file (boot.itb) is created with:
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.. code-block:: bash
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mkimage -f source.its boot.itb
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In U-Boot the script can be loaded and execute like this
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.. code-block::
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=> load host 0:1 $loadaddr boot.itb
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1552 bytes read in 0 ms
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=> source $loadaddr#conf-1
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## Executing script at 00000000
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1
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=> source $loadaddr#conf-2
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## Executing script at 00000000
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2
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=> source $loadaddr:script-1
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## Executing script at 00000000
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1
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=> source $loadaddr:script-2
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## Executing script at 00000000
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2
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=> source $loadaddr
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## Executing script at 00000000
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2
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=> source \#conf-1
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## Executing script at 00000000
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1
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=> source '#conf-1'
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## Executing script at 00000000
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1
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=> source ':script-1'
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## Executing script at 00000000
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1
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=> source
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## Executing script at 00000000
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2
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=>
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Instead of specifying command line instructions directly in the *data* property
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of the image tree source file another file can be included. Here is a minimal
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example which encapsulates the file boot.txt:
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.. code-block::
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/dts-v1/;
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/ {
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description = "";
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images {
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script {
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data = /incbin/("./boot.txt");
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type = "script";
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};
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};
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};
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Legacy U-Boot image
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'''''''''''''''''''
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A script file using the legacy U-Boot image file format can be created based on
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a text file. Let's use this example text file (boot.txt):
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.. code-block:: bash
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echo Hello from a script
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echo -------------------
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The boot scripts (boot.scr) is created with:
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.. code-block:: bash
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mkimage -T script -n 'Test script' -d boot.txt boot.scr
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The script can be execute in U-Boot like this:
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.. code-block::
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=> load host 0:1 $loadaddr boot.scr
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122 bytes read in 0 ms
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=> source $loadaddr
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## Executing script at 00000000
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Hello from a script
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-------------------
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=> source
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## Executing script at 00000000
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Hello from a script
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-------------------
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=>
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Configuration
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-------------
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The source command is only available if CONFIG_CMD_SOURCE=y.
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The FIT image file format requires CONFIG_FIT=y.#
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The legacy U-Boot image file format requires CONFIG_LEGACY_IMAGE_FORMAT=y.
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On hardened systems support for the legacy U-Boot image format should be
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disabled as these images cannot be signed and verified.
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Return value
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------------
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If the scripts is executed successfully, the return value $? is 0 (true).
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Otherwise it is 1 (false).
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