[PATCH v3 11/11] doc: board: ti: am62lx_evm: add initial docs for the AM62L-EVM

Bryan Brattlof <[email protected]> Mon, 3 Aug 2026 19:09:36 -0500
Newsgroups gmane.comp.boot-loaders.u-boot
Message-ID <[email protected]>
Add the initial documentation on the bootflow, build, and deubgging
procedures along with the relevant links to more information about the
AM62Lx processor and the reference board.

Tested-by: Anshul Dalal <[email protected]>
Signed-off-by: Bryan Brattlof <[email protected]>
---
Changes in v3:
- Used CROSS_COMPILE=$CC64 to align with other board docs
- Link to v2: https://lore.kernel.org/r/[email protected]
---
 doc/board/ti/am62lx_evm.rst                     | 222 ++++++++++
 doc/board/ti/img/am62lx_boot_diagram_phase1.svg | 450 ++++++++++++++++++++
 doc/board/ti/img/am62lx_boot_diagram_phase2.svg | 525 ++++++++++++++++++++++++
 doc/board/ti/img/am62lx_tiboot3.bin.svg         | 170 ++++++++
 doc/board/ti/img/am62lx_tispl.bin.svg           | 222 ++++++++++
 doc/board/ti/img/am62lx_u-boot.img.svg          | 143 +++++++
 doc/board/ti/k3.rst                             |   1 +
 7 files changed, 1733 insertions(+)

diff --git a/doc/board/ti/am62lx_evm.rst b/doc/board/ti/am62lx_evm.rst
new file mode 100644
index 000000000000..84fdc1e710e1
--- /dev/null
+++ b/doc/board/ti/am62lx_evm.rst
@@ -0,0 +1,222 @@
+.. SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+.. sectionauthor:: Bryan Brattlof <[email protected]>
+
+AM62Lx Platforms
+================
+
+The AM62L is a lite, low power and performance optimized family
+of application processors that are built for Linux application
+development. The AM62L is well suited for a wide range of
+general-purpose applications with scalable ARM Cortex-A53 core
+performance and embedded features such as: Multimedia DSI/DPI support,
+integrated ADC on chip, advanced lower power management modes, and
+extensive security options for IP protection with the built-in security
+features.
+
+The AM62L is a general purpose processor, however some of the
+applications well suited for it include: Human Machine Interfaces (HMI),
+Medical patient monitoring , Building automation, Smart secure gateways,
+Smart Thermostats, EV charging stations, Smart Metering, Solar energy
+and more.
+
+Some highlights of AM62L SoC are:
+
+- Single to Dual 64-bit Arm® Cortex®-A53 microprocessor subsystem up to
+  1.25GHz Integrated Giga-bit Ethernet switch supporting up to a total
+  of two external ports
+
+- 16-bit DDR Subsystem that supports LPDDR4, DDR4 memory types.
+
+- Display support: 1x display support over MIPI DSI (4 lanes DPHY) or
+  DPI (24-bit RGB LVCMOS)
+
+- Multiple low power modes support, ex: Deep sleep and Standby
+
+- Support for secure boot, Trusted Execution Environment (TEE) &
+  Cryptographic Acceleration
+
+For more information check out our `Technical Reference Manual (TRM)`_.
+
+.. _Technical Reference Manual (TRM): https://www.ti.com/lit/ug/sprujb4/sprujb4.pdf
+
+
+Boot Flow:
+----------
+
+The AM62Lx SoCs deviate significantly from the typical boot-flow of the
+other Sitara or Jacinto class of SoCs.
+
+The first CPU released on power on will be the Security Management
+Subsystem (SMS) MCU to first secure the device like all other K3 SoCs.
+However because the lack of any MCU cores the boot ROM is located on one
+of the A53 cores which is responsible for loading TI's root-of-trust
+firmware (TIFS) along with a BL1 image generated from the
+ARM-Trusted-Firmware repository. The BL1 image is responsible for
+initializing the debug console, the DDR controller, and speeding up the
+A53 to it's maximum allowable.
+
+Once the BL1 is done, it will send a message back to the SMS core to
+reset and begin the second boot phase.
+
+.. image:: img/am62lx_boot_diagram_phase1.svg
+   :alt: First phase of the AM62L boot flow
+
+For the second boot phase, with DDR active ROM can now load the larger
+images contained in the tispl.bin (or whatever filename or offset was
+configured during the BL1 boot phase) which contains TI's root-of-trust
+firmware (TIFS) along with OP-TEE, TF-A's BL31 and U-Boot SPL images to
+initialize the root-of-trust, and the TrustZone and normal world for the
+A53s.
+
+From there the U-Boot SPL will load and authenticate U-Boot proper.
+
+.. image:: img/am62lx_boot_diagram_phase2.svg
+   :alt: Second phase of the AM62L boot flow
+
+Sources:
+--------
+
+.. include::  ../ti/k3.rst
+    :start-after: .. k3_rst_include_start_boot_sources
+    :end-before: .. k3_rst_include_end_boot_sources
+
+Build procedure:
+----------------
+
+0. Setup the environment variables:
+
+   .. include::  ../ti/k3.rst
+       :start-after: .. k3_rst_include_start_common_env_vars_desc
+       :end-before: .. k3_rst_include_end_common_env_vars_desc
+
+   .. include::  ../ti/k3.rst
+       :start-after: .. k3_rst_include_start_board_env_vars_desc
+       :end-before: .. k3_rst_include_end_board_env_vars_desc
+
+   Set the variables corresponding to this platform:
+
+   .. include::  ../ti/k3.rst
+       :start-after: .. k3_rst_include_start_common_env_vars_defn
+       :end-before: .. k3_rst_include_end_common_env_vars_defn
+
+   .. prompt:: bash $
+
+      export UBOOT_CFG_CORTEXA=am62lx_evm_defconfig
+      export TFA_BOARD=am62lx-evm
+      export OPTEE_PLATFORM=k3-am62lx
+
+1. Build Trusted Firmware-A:
+
+   More detailed porting and build guide can be found in the `TF-A
+   documentation`_ for all AM62L based platforms. For the AM62L-EVM the
+   build command will be:
+
+   .. prompt:: bash $
+
+      make CROSS_COMPILE=$CC64 \
+            ARCH=aarch64 \
+            PLAT=k3low \
+            TARGET_BOARD=$TFA_BOARD
+
+.. _TF-A documentation: https://trustedfirmware-a.readthedocs.io/en/latest/plat/ti-k3low-am62lx.html
+
+#. Build OP-TEE:
+
+   Depending on the application more build arguments may be needed. The
+   `OP-TEE documentation`_ has more information on this. The basic build
+   commands for the AM62L-EVM are:
+
+   .. prompt:: bash $
+
+      make CROSS_COMPILE=$CC32 \
+            CROSS_COMPILE64=$CC64 \
+            CFG_ARM64_core=y \
+            $OPTEE_EXTRA_ARGS \
+            PLATFORM=$OPTEE_PLATFORM
+
+.. _OP-TEE documentation: https://optee.readthedocs.io/en/latest/
+
+#. Build U-Boot:
+
+   .. prompt:: bash $
+
+      make $UBOOT_CFG_CORTEXA
+      make CROSS_COMPILE=$CC64 \
+            BINMAN_INDIRS="$LNX_FW_PATH" \
+            TEE="$OPTEE_PATH/out/arm-plat-k3/core/tee-raw.bin" \
+            BL1="$TFA_PATH/build/k3low/$TFA_BOARD/release/bl1.bin" \
+            BL31="$TFA_PATH/build/k3low/$TFA_BOARD/release/bl31.bin"
+
+Image formats:
+--------------
+
+The final images generated and needed for booting the AM62L are:
+
+- tiboot3.bin
+
+.. image:: img/am62lx_tiboot3.bin.svg
+   :alt: tiboot3.bin image format
+
+- tispl.bin
+
+.. image:: img/am62lx_tispl.bin.svg
+   :alt: tispl.bin image format
+
+- u-boot.img
+
+.. image:: img/am62lx_u-boot.img.svg
+   :alt: u-boot.img image format
+
+Switch Setting for Boot Mode
+----------------------------
+
+Boot Mode pins provide means to select the boot mode and options before the
+device is powered up. After every POR, they are the main source to populate
+the Boot Parameter Tables.
+
+The following table shows some common boot modes used on AM62L-EVM
+
+.. list-table::
+   :widths: 16 16 8 8
+   :header-rows: 1
+
+   * - Switch Label
+     - SW4: 12345678
+     - SW2: 1234
+     - SW3: 1234
+
+   * - EMMC
+     - 11010010
+     - 0000
+     - 0000
+
+   * - SD
+     - 11000010
+     - 0100
+     - 0000
+
+   * - UART
+     - 11011100
+     - 0000
+     - 0000
+
+   * - USB DFU
+     - 11001010
+     - 0000
+     - 0000
+
+Debugging U-Boot
+----------------
+
+See :ref:`Common Debugging environment - OpenOCD<k3_rst_refer_openocd>`: for
+detailed setup information.
+
+.. include::  k3.rst
+    :start-after: .. k3_rst_include_start_openocd_connect_XDS110
+    :end-before: .. k3_rst_include_end_openocd_connect_XDS110
+
+To start OpenOCD and connect to the board
+
+.. prompt:: bash
+
+   openocd -f board/ti/am62levm.cfg
diff --git a/doc/board/ti/img/am62lx_boot_diagram_phase1.svg b/doc/board/ti/img/am62lx_boot_diagram_phase1.svg
new file mode 100644
index 000000000000..fe10d1a253d8
--- /dev/null
+++ b/doc/board/ti/img/am62lx_boot_diagram_phase1.svg
@@ -0,0 +1,450 @@
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diff --git a/doc/board/ti/img/am62lx_u-boot.img.svg b/doc/board/ti/img/am62lx_u-boot.img.svg
new file mode 100644
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diff --git a/doc/board/ti/k3.rst b/doc/board/ti/k3.rst
index b7b69949af16..56df72b656bd 100644
--- a/doc/board/ti/k3.rst
+++ b/doc/board/ti/k3.rst
@@ -33,6 +33,7 @@ K3 Based SoCs
    am62ax_sk
    am62dx_evm
    am62x_sk
+   am62lx_evm
    am62px_sk
    am6254atl_sk
    am64x_evm

-- 
2.54.0