[PATCH] doc: tlv: add images and custom format documentation
Fabian Pflug
f.pflug at pengutronix.de
Tue Apr 21 03:15:35 PDT 2026
Improve the documentation by adding some images to make the
interdependencies clearer and add an example on how to define custom TLV
data format.
---
Signed-off-by: Fabian Pflug <f.pflug at pengutronix.de>
---
Documentation/user/barebox-tlv.rst | 113 +++++++++++++++++++++++++++
Documentation/user/figures/tlv_generator.svg | 4 +
Documentation/user/figures/tlv_usage.svg | 4 +
3 files changed, 121 insertions(+)
diff --git a/Documentation/user/barebox-tlv.rst b/Documentation/user/barebox-tlv.rst
index adade8a29b..3884d17409 100644
--- a/Documentation/user/barebox-tlv.rst
+++ b/Documentation/user/barebox-tlv.rst
@@ -10,6 +10,10 @@ Data is stored in a tag-length-value format (hence the name) and read
from non-volatile memory during startup.
Unpacked values are stored in the devicetree ``chosen``-node.
+.. image:: figures/tlv_usage.svg
+ :width: 40%
+ :align: center
+
barebox TLV consists of two components:
* The parser inside barebox (``common/tlv``).
@@ -61,6 +65,21 @@ The tag range ``0x0000`` to ``0x7FFF`` is intended for common tags,
that can be used in every schema.
These common tags are defined in ``common/tlv/barebox.c``.
+.. csv-table:: TLV predefined tags
+ :header: "ID", "Name", "Description"
+ :widths: 10, 20, 30
+
+ 0x0002, device-hardware-release, "Detailed release information string for the device"
+ 0x0003, factory-timestamp, "UNIX timestamp of fabrication"
+ 0x0004, device-serial-number, "Device serial number string"
+ 0x0005, modification, "Modification: 0: Device unmodified; 1: undocumented modifications"
+ 0x0006, featureset, "A comma separated list of features"
+ 0x0007, pcba-serial-number, "Printed Circuit Board Assembly serial number string"
+ 0x0008, pcba-hardware-release, "Printed Circuit Board Assembly hardware release"
+ 0x0011, ethernet-address, "A list of Ethernet addresses or a single Ethernet address"
+ 0x0012, ethernet-address, "A sequence of subsequent Ethernet addresses, by number and starting address"
+ 0x0024, bound-soc-uid, "Reject TLV if supplied binary data does not match UID SoC register"
+
The tag range ``0x8000`` to ``0xFFFF`` is intended for custom extensions.
Parsing must be handled by board-specific extensions.
@@ -102,6 +121,8 @@ This schema defines some well-known tags and two board-specific tags.
Afterwards another yaml-file with the data for the TLV binary is needed.
An example can be found in ``scripts/bareboxtlv-generator/data-example.yaml``.
+.. image:: figures/tlv_generator.svg
+
With these information in place a TLV binary can be created:
.. code-block:: shell
@@ -118,3 +139,95 @@ that is correctly configured, can be used as KEY.
.. note::
The ``FactoryDataset`` class in ``bareboxtlv-generator.py``
is intended to be used as a library.
+
+Data Location
+-------------
+
+The generated ``tlv.bin`` file has to be stored on the device in a known location.
+This location can for example be described inside the devicetree of the device.
+
+.. code-block:: dts
+ :emphasize-lines: 8,10
+
+ &eeprom1 {
+ partitions {
+ compatible = "fixed-partitions";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ tlv_partition: partition at 0 {
+ compatible = "barebox,tlv-v1";
+ label = "barebox_tlv";
+ reg = <0x0 0x1000>;
+ };
+ };
+ };
+
+The ``compatible`` defines the format to parse the TLV data as and the ``reg``
+describes the size of the data.
+
+Custom TLV format
+-----------------
+
+A custom TLV format can be created for example like this:
+
+.. code-block:: c
+ :linenos:
+
+ #include <string.h>
+ #include <tlv/tlv.h>
+ #include <common.h>
+
+ #define TLV_MAGIC_CUSTOM_V1_SIGNED 0xe3573cd3
+
+ static struct tlv_mapping custom_tlv_v1_mappings[] = {
+ /* UNIX timestamp of fabrication */
+ { 0x0003, tlv_format_timestamp, "factory-timestamp" },
+ /* Device serial number string */
+ { 0x0004, tlv_handle_serial, "device-serial-number" },
+ /* a comma separated list of features */
+ { 0x0006, tlv_format_str, "featureset" },
+ /* Printed Circuit Board Assembly serial number string */
+ { 0x0007, tlv_format_str, "pcba-serial-number" },
+ /* Reject TLV if supplied binary data does not match UID SoC register */
+ { 0x0024, tlv_bind_soc_uid, "bound-soc-uid" },
+ /* Custom key */
+ { 0x8001, tlv_format_str, "custom-key"},
+ { /* sentintel */ },
+ };
+
+ static struct tlv_mapping *mappings[] = {
+ custom_tlv_v1_mappings,
+ NULL
+ };
+
+ static struct of_device_id matches[] = {
+ { .compatible = "custom,tlv-v1" },
+ { /* sentinel */ }
+ };
+
+ static struct tlv_decoder custom_tlv_v1 = {
+ .magic = TLV_MAGIC_CUSTOM_V1_SIGNED,
+ .driver.name = "custom-tlv-v1",
+ .driver.of_compatible = matches,
+ .mappings = mappings,
+ .signature_keyring = "tlv-custom",
+ };
+
+ static int custom_tlv_v1_register(void)
+ {
+ return tlv_register_decoder(&custom_tlv_v1);
+ }
+ of_populate_initcall(custom_tlv_v1_register);
+
+* line 7-21: Every possible mapping, that is used must be listed here.
+* line 19: The mapping includes a custom tag.
+ All tags above ``0x8000`` are reserved for custom use.
+* line 29: The compatible string of the partition, that will contain the data.
+* line 5,34: Some randomly generated 32bit value to uniquely identify the
+ mapping-table.
+* line 38: The keyring tlv-stange should be used to validate the signature.
+ Keys for the keyring are specified in the barebox config
+ ``CONFIG_CRYPTO_PUBLIC_KEYS`` with for example:
+ ``keyring=tlv-custom:__ENV__TLV_KEY``.
+* line 41-45: Registers the format into barebox.
diff --git a/Documentation/user/figures/tlv_generator.svg b/Documentation/user/figures/tlv_generator.svg
new file mode 100644
index 0000000000..84ab826145
--- /dev/null
+++ b/Documentation/user/figures/tlv_generator.svg
@@ -0,0 +1,4 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1084.0095900272352 540.311838317604" width="1084.0095900272352" height="540.311838317604"><!-- svg-source:excalidraw --><metadata></metadata><defs><style class="style-fonts">
+ @font-face { font-family: Excalifont; src: 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---
base-commit: c3e3a36f1511a7b4f34061b7be118085b80f7165
change-id: 20260421-v2026-04-0-topic-tlv-doc-e1e56321f477
Best regards,
--
Fabian Pflug <f.pflug at pengutronix.de>
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