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fix(buildroot): add architecture for buildroot
Add a architecture diagram for buildroot build system using graphviz in graphviz folder and include it in overview rst. Signed-off-by: Mahammed Sadik Shaik <s-sadik@ti.com>
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‎source/buildroot/Overview.rst‎

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@@ -8,7 +8,48 @@ cross-compiled toolchains, root filesystems, Linux kernels, and bootloaders.
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Buildroot is highly customizable, allowing developers to tailor their Linux
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environment to meet the specific needs of their embedded projects.
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Buildroot official Git repository is hosted at `Gitlab/Buildroot <https://gitlab.com/buildroot.org/buildroot/>`__.
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**************************************
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Buildroot Architecture for TI Devices
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**************************************
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The diagram below shows the Buildroot-based Linux embedded software distribution main components for TI devices.
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The open-source Linux\ :sup:`®` distribution, based on the Buildroot build system, running on the Arm\ :sup:`®` Cortex\ :sup:`®`\-A processors, includes:
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- **TI BSP Components** — the Texas Instruments Board Support Package, comprising:
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- The boot chain based on **TF-A** (Trusted Firmware-A) and **U-Boot**.
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- The secure monitor based on **TF-A** and **OP-TEE**, running on the Arm\ :sup:`®`
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Cortex\ :sup:`®`\-A in secure mode.
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- The **OP-TEE** secure OS running on the Arm\ :sup:`®` Cortex\ :sup:`®`\-A in secure mode,
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providing a Trusted Execution Environment (TEE) for Trusted Applications.
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- The **Linux Kernel** and **TI Kernel Drivers** running on the Arm\ :sup:`®`
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Cortex\ :sup:`®`\-A in non-secure mode, along with board-specific **Device Trees**.
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- The **TI Linux Firmware** providing co-processor firmwares
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(not applicable for AM62Lx-EVM).
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- **Buildroot Build System** — consisting of:
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- **Buildroot Core**: the upstream Buildroot framework that drives the entire build.
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- **Buildroot External-TI**: the TI-specific external tree
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(`buildroot-external-TI <https://github.com/TexasInstruments/buildroot-external-TI>`__)
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that adds TI board configurations, packages, and patches without modifying upstream Buildroot.
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- **Applications** — the user-space software layer built on top of the BSP, including
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GUI applications, custom applications, Trusted Applications running under OP-TEE,
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and middleware and libraries.
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- **Build Artifacts** — the outputs produced by the Buildroot build system: an SD card
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image, individual boot artifacts, and a root filesystem.
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.. note::
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Each component in the diagram below is a **clickable hyperlink** that navigates
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directly to the corresponding source repository or documentation.
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.. graphviz:: ../graphviz/Buildroot_architecture.gv
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:caption: Buildroot-based Linux Architecture for TI Devices
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*************************
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Key Features of Buildroot

‎source/graphviz/Buildroot_architecture.gv‎

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digraph buildroot_architecture {
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rankdir=TB;
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graph [splines=ortho, nodesep=0.5, ranksep=0.7,
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fontname="Arial", pad=0.5, bgcolor="white"];
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node [fontname="Arial", fontsize=7, margin=0];
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edge [fontname="Arial", fontsize=11, penwidth=2.0,
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arrowsize=1.2];
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subgraph cluster_outer {
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label="Buildroot-based Linux(R) Embedded Software for TI Devices";
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style="filled,bold";
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fillcolor="#F0F4FF";
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color="#1A237E";
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penwidth=4;
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fontsize=20;
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fontcolor="#1A237E";
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fontname="Arial Bold";
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apps [
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shape=none,
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label=<
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<TABLE BORDER="4" CELLBORDER="0" CELLSPACING="5"
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CELLPADDING="6" BGCOLOR="#E8F5E9"
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COLOR="#2E7D32" STYLE="ROUNDED">
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<TR>
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<TD COLSPAN="2" BGCOLOR="#2E7D32"
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STYLE="ROUNDED" WIDTH="300">
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<FONT COLOR="white" POINT-SIZE="13">
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<B>&#9312; Applications</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD BGCOLOR="#43A047" STYLE="ROUNDED"
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WIDTH="140" HEIGHT="40">
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<FONT COLOR="white" POINT-SIZE="11">
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<B>GUI Applications</B>
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</FONT>
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</TD>
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<TD BGCOLOR="#43A047" STYLE="ROUNDED"
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WIDTH="140" HEIGHT="40">
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<FONT COLOR="white" POINT-SIZE="11">
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<B>Custom Applications</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD BGCOLOR="#66BB6A" STYLE="ROUNDED"
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WIDTH="140" HEIGHT="40">
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<FONT COLOR="white" POINT-SIZE="11">
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<B>Trusted Applications</B>
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</FONT>
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</TD>
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<TD BGCOLOR="#66BB6A" STYLE="ROUNDED"
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WIDTH="140" HEIGHT="40">
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<FONT COLOR="white" POINT-SIZE="11">
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<B>Middleware and Libraries</B>
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</FONT>
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</TD>
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</TR>
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</TABLE>
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>
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];
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buildroot [
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shape=none,
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label=<
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<TABLE BORDER="4" CELLBORDER="0" CELLSPACING="5"
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CELLPADDING="9" BGCOLOR="#FFFDE7"
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COLOR="#E65100" STYLE="ROUNDED">
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<TR>
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<TD COLSPAN="2" BGCOLOR="#E65100"
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STYLE="ROUNDED" WIDTH="300"
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HREF="https://gitlab.com/buildroot.org/buildroot/"
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TARGET="_blank"
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TOOLTIP="Buildroot official repository">
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<FONT COLOR="white" POINT-SIZE="13">
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<B>&#9313; Buildroot Build System</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD BGCOLOR="#F9A825" STYLE="ROUNDED"
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WIDTH="140" HEIGHT="55"
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HREF="https://gitlab.com/buildroot.org/buildroot/"
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TARGET="_blank"
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TOOLTIP="Buildroot Core repository">
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<FONT COLOR="#3E2723" POINT-SIZE="13">
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<B>Buildroot</B>
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</FONT>
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</TD>
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<TD BGCOLOR="#FFB300" STYLE="ROUNDED"
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WIDTH="140" HEIGHT="55"
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HREF="https://github.com/TexasInstruments/buildroot-external-TI"
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TARGET="_blank"
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TOOLTIP="TI Buildroot external tree repository">
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<FONT COLOR="#3E2723" POINT-SIZE="13">
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<B>Buildroot External-TI</B>
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</FONT>
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</TD>
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</TR>
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</TABLE>
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>
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];
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tibsp [
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shape=none,
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label=<
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<TABLE BORDER="4" CELLBORDER="0" CELLSPACING="5"
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CELLPADDING="6" BGCOLOR="#EDE7F6"
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COLOR="#4527A0" STYLE="ROUNDED">
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<TR>
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<TD COLSPAN="4" BGCOLOR="#4527A0"
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STYLE="ROUNDED" WIDTH="300">
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<FONT COLOR="white" POINT-SIZE="13">
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<B>&#9314; TI BSP Components</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD COLSPAN="4" BGCOLOR="#512DA8" STYLE="ROUNDED">
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<FONT COLOR="white" POINT-SIZE="10">
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<B>Firmware and Security Components</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD BGCOLOR="#7B1FA2" STYLE="ROUNDED"
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WIDTH="68" HEIGHT="40"
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HREF="https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/"
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TARGET="_blank"
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TOOLTIP="Trusted Firmware-A repository">
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<FONT COLOR="white" POINT-SIZE="10">
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<B>TF-A</B>
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</FONT>
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</TD>
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<TD BGCOLOR="#8E24AA" STYLE="ROUNDED"
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WIDTH="68" HEIGHT="40"
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HREF="https://github.com/OP-TEE/optee_os"
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TARGET="_blank"
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TOOLTIP="OP-TEE OS repository">
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<FONT COLOR="white" POINT-SIZE="10">
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<B>OP-TEE</B>
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</FONT>
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</TD>
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<TD BGCOLOR="#AB47BC" STYLE="ROUNDED"
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WIDTH="88" HEIGHT="40"
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HREF="https://git.ti.com/cgit/processor-firmware/ti-linux-firmware"
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TARGET="_blank"
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TOOLTIP="TI Linux Firmware repository">
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<FONT COLOR="white" POINT-SIZE="10">
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<B>TI Linux Firmware</B>
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<BR/>
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<FONT POINT-SIZE="7">
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(N/A for AM62Lx-EVM)
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</FONT>
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</FONT>
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</TD>
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<TD BGCOLOR="#9C27B0" STYLE="ROUNDED"
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WIDTH="68" HEIGHT="40"
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HREF="https://github.com/u-boot/u-boot"
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TARGET="_blank"
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TOOLTIP="U-Boot repository">
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<FONT COLOR="white" POINT-SIZE="10">
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<B>U-Boot</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD COLSPAN="4" BGCOLOR="#1565C0" STYLE="ROUNDED">
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<FONT COLOR="white" POINT-SIZE="10">
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<B>Linux Kernel Components</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD BGCOLOR="#1976D2" STYLE="ROUNDED"
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WIDTH="68" HEIGHT="40"
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HREF="https://github.com/TexasInstruments/ti-linux-kernel/tree/ti-linux-6.18.y"
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TARGET="_blank"
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TOOLTIP="Linux Kernel repository">
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<FONT COLOR="white" POINT-SIZE="10">
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<B>TI Linux Kernel</B>
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</FONT>
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</TD>
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<TD COLSPAN="2" BGCOLOR="#1E88E5"
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STYLE="ROUNDED" HEIGHT="40"
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HREF="https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel"
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TARGET="_blank"
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TOOLTIP="TI Linux Kernel repository">
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<FONT COLOR="white" POINT-SIZE="10">
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<B>TI Kernel Drivers</B>
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</FONT>
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</TD>
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<TD BGCOLOR="#42A5F5" STYLE="ROUNDED"
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WIDTH="68" HEIGHT="40"
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HREF="https://github.com/torvalds/linux/tree/master/arch/arm64/boot/dts/ti"
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TARGET="_blank"
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TOOLTIP="TI Device Tree sources">
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<FONT COLOR="white" POINT-SIZE="10">
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<B>Device Tree</B>
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</FONT>
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</TD>
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</TR>
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</TABLE>
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>
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];
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artifacts [
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shape=none,
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label=<
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<TABLE BORDER="4" CELLBORDER="0" CELLSPACING="5"
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CELLPADDING="6" BGCOLOR="#F3E5F5"
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COLOR="#880E4F" STYLE="ROUNDED">
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<TR>
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<TD COLSPAN="3" BGCOLOR="#880E4F"
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STYLE="ROUNDED" WIDTH="300">
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<FONT COLOR="white" POINT-SIZE="13">
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<B>Build Artifacts</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD BGCOLOR="#AD1457" STYLE="ROUNDED"
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WIDTH="92" HEIGHT="38">
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<FONT COLOR="white" POINT-SIZE="11">
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<B>SD Card Image</B>
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</FONT>
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</TD>
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<TD BGCOLOR="#C2185B" STYLE="ROUNDED"
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WIDTH="92" HEIGHT="38">
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<FONT COLOR="white" POINT-SIZE="11">
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<B>Boot Artifacts</B>
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</FONT>
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</TD>
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<TD BGCOLOR="#D81B60" STYLE="ROUNDED"
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WIDTH="92" HEIGHT="38">
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<FONT COLOR="white" POINT-SIZE="11">
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<B>Root Filesystem</B>
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</FONT>
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</TD>
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</TR>
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</TABLE>
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>
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];
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legend [
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shape=none,
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label=<
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<TABLE BORDER="2" CELLBORDER="0" CELLSPACING="3"
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CELLPADDING="4" BGCOLOR="#FAFAFA"
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COLOR="#424242" STYLE="ROUNDED">
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<TR>
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<TD COLSPAN="2" BGCOLOR="#424242"
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STYLE="ROUNDED" WIDTH="200">
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<FONT COLOR="white" POINT-SIZE="11">
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<B>Legend</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD BGCOLOR="#2E7D32" STYLE="ROUNDED"
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WIDTH="16" HEIGHT="16">
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<FONT COLOR="white" POINT-SIZE="4"> </FONT>
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</TD>
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<TD ALIGN="LEFT" WIDTH="180">
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<FONT COLOR="#2E7D32" POINT-SIZE="10">
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<B>Applications Layer</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD BGCOLOR="#E65100" STYLE="ROUNDED"
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WIDTH="16" HEIGHT="16">
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<FONT COLOR="white" POINT-SIZE="4"> </FONT>
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</TD>
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<TD ALIGN="LEFT" WIDTH="180">
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<FONT COLOR="#E65100" POINT-SIZE="10">
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<B>Buildroot Build System</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD BGCOLOR="#4527A0" STYLE="ROUNDED"
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WIDTH="16" HEIGHT="16">
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<FONT COLOR="white" POINT-SIZE="4"> </FONT>
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</TD>
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<TD ALIGN="LEFT" WIDTH="180">
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<FONT COLOR="#4527A0" POINT-SIZE="10">
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<B>TI BSP Components</B>
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</FONT>
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</TD>
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</TR>
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<TR>
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<TD BGCOLOR="#880E4F" STYLE="ROUNDED"
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WIDTH="16" HEIGHT="16">
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<FONT COLOR="white" POINT-SIZE="4"> </FONT>
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</TD>
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<TD ALIGN="LEFT" WIDTH="180">
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<FONT COLOR="#880E4F" POINT-SIZE="10">
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<B>Build Artifacts</B>
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</FONT>
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</TD>
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</TR>
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</TABLE>
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>
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];
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}
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// Vertical flow: apps -> buildroot -> tibsp -> artifacts -> legend
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apps -> buildroot [style=invis, weight=100];
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buildroot -> tibsp [style=invis, weight=100];
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tibsp -> artifacts [style=invis, weight=100];
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artifacts -> legend [style=invis, weight=100];
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// Data-flow edges (constraint=false so they don't affect layout)
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apps -> buildroot [
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color="#2E7D32",
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penwidth=2.5,
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arrowsize=1.2,
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fontcolor="#2E7D32",
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fontsize=11,
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fontname="Arial Bold",
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constraint=false
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];
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tibsp -> buildroot [
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color="#4527A0",
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penwidth=2.5,
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arrowsize=1.2,
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fontcolor="#4527A0",
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fontsize=11,
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fontname="Arial Bold",
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constraint=false
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];
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buildroot -> artifacts [
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color="#E65100",
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penwidth=3.0,
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arrowsize=1.5,
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label=" Output ",
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fontcolor="#E65100",
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fontsize=11,
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fontname="Arial Bold",
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style=bold,
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constraint=false
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];
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}

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