[PATCH V4 8/8] doc: board: ti: Add BeaglePlay documentation

Mattijs Korpershoek mkorpershoek at baylibre.com
Wed Aug 23 10:36:53 CEST 2023


Hi Nishanth,

On mar., août 22, 2023 at 13:41, Nishanth Menon <nm at ti.com> wrote:

> Add base documentation for BeaglePlay
>
> Signed-off-by: Nishanth Menon <nm at ti.com>

This is great! Thanks a lot for the documentation update, especially the
"Flash to eMMC" section.

Reviewed-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>

> ---
> Cc: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
>
> Changes Since V3:
> * Updated documentation to give a more clear overview of MMC partitions
>   and flashing information.
> * Added OpenOCD debug documentation
> * Added LED status information and indication of various boot stages
>
> V3: https://lore.kernel.org/all/20230815164440.2713726-5-nm@ti.com/
> V2: https://lore.kernel.org/u-boot/20230727234446.3651836-5-nm@ti.com/
> V1: https://lore.kernel.org/all/20230725185253.2123433-7-nm@ti.com/
>
>  doc/board/ti/am62x_beagleplay.rst    | 256 ++++++++++
>  doc/board/ti/img/beagleplay_emmc.svg | 697 +++++++++++++++++++++++++++
>  doc/board/ti/k3.rst                  |   1 +
>  3 files changed, 954 insertions(+)
>  create mode 100644 doc/board/ti/am62x_beagleplay.rst
>  create mode 100644 doc/board/ti/img/beagleplay_emmc.svg
>
> diff --git a/doc/board/ti/am62x_beagleplay.rst b/doc/board/ti/am62x_beagleplay.rst
> new file mode 100644
> index 000000000000..5adb7b4c9ace
> --- /dev/null
> +++ b/doc/board/ti/am62x_beagleplay.rst
> @@ -0,0 +1,256 @@
> +.. SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
> +.. sectionauthor:: Nishanth Menon <nm at ti.com>
> +
> +AM62x Beagleboard.org Beagleplay
> +================================
> +
> +Introduction:
> +-------------
> +
> +BeagleBoard.org BeaglePlay is an easy to use, affordable open source
> +hardware single board computer based on the Texas Instruments AM625
> +SoC that allows you to create connected devices that work even at long
> +distances using IEEE 802.15.4g LR-WPAN and IEEE 802.3cg 10Base-T1L.
> +Expansion is provided over open standards based mikroBUS, Grove and
> +QWIIC headers among other interfaces.
> +
> +Further information can be found at:
> +
> +* Product Page: https://beagleplay.org/
> +* Hardware documentation: https://git.beagleboard.org/beagleplay/beagleplay
> +
> +Boot Flow:
> +----------
> +Below is the pictorial representation of boot flow:
> +
> +.. image:: img/boot_diagram_k3_current.svg
> +  :alt: Boot flow diagram
> +
> +- On this platform, 'TI Foundational Security' (TIFS) functions as the
> +  security enclave master while 'Device Manager' (DM), also known as the
> +  'TISCI server' in "TI terminology", offers all the essential services.
> +  The A53/M4F (Aux core) sends requests to TIFS/DM to accomplish these
> +  services, as illustrated in the diagram above.
> +
> +Sources:
> +--------
> +.. include::  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::  k3.rst
> +    :start-after: .. k3_rst_include_start_common_env_vars_desc
> +    :end-before: .. k3_rst_include_end_common_env_vars_desc
> +
> +.. include::  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::  k3.rst
> +    :start-after: .. k3_rst_include_start_common_env_vars_defn
> +    :end-before: .. k3_rst_include_end_common_env_vars_defn
> +.. code-block:: bash
> +
> + $ export UBOOT_CFG_CORTEXR="am62x_evm_r5_defconfig beagleplay_r5.config"
> + $ export UBOOT_CFG_CORTEXA="am62x_evm_a53_defconfig beagleplay_a53.config"
> + $ export TFA_BOARD=lite
> + $ # we dont use any extra TFA parameters
> + $ unset TFA_EXTRA_ARGS
> + $ export OPTEE_PLATFORM=k3-am62x
> + $ export OPTEE_EXTRA_ARGS="CFG_WITH_SOFTWARE_PRNG=y"
> +
> +.. include::  am62x_sk.rst
> +    :start-after: .. am62x_evm_rst_include_start_build_steps
> +    :end-before: .. am62x_evm_rst_include_end_build_steps
> +
> +Target Images
> +--------------
> +Copy the below images to an SD card and boot:
> +
> +* tiboot3-am62x-gp-evm.bin from R5 build as tiboot3.bin
> +* tispl.bin_unsigned from Cortex-A build as tispl.bin
> +* u-boot.img_unsigned from Cortex-A build as uboot.img
> +
> +Image formats:
> +--------------
> +
> +- tiboot3.bin
> +
> +.. image:: img/multi_cert_tiboot3.bin.svg
> +  :alt: tiboot3.bin image format
> +
> +- tispl.bin
> +
> +.. image:: img/dm_tispl.bin.svg
> +  :alt: tispl.bin image format
> +
> +Flash to eMMC
> +-------------
> +
> +The eMMC layout selected is user-friendly for developers. The
> +boot hardware partition of the eMMC only contains the fixed-size
> +tiboot3.bin image. This is because the contents of the boot partitions
> +need to run from the SoC's internal SRAM, which remains a fixed size
> +constant. The other components of the boot sequence, such as tispl.bin
> +and u-boot.img, are located in the /BOOT partition in the User Defined
> +Area (UDA) hardware partition of the eMMC. These components can vary
> +significantly in size, so readjusting the boot partition offsets is
> +not practical.
> +
> +.. image:: img/beagleplay_emmc.svg
> +  :alt: eMMC partitions and boot file organization for BeaglePlay
> +
> +The following are the steps from Linux shell to program eMMC:
> +
> +.. code-block:: bash
> +
> +  # # Enable Boot0 boot
> +  # mmc bootpart enable 1 2 /dev/mmcblk0
> +  # mmc bootbus set single_backward x1 x8 /dev/mmcblk0
> +  # mmc hwreset enable /dev/mmcblk0
> +
> +  # # Clear eMMC boot0
> +  # echo '0' >> /sys/class/block/mmcblk0boot0/force_ro
> +  # dd if=/dev/zero of=/dev/mmcblk0boot0 count=32 bs=128k
> +  # # Write tiboot3.bin
> +  # dd if=tiboot3.bin of=/dev/mmcblk0boot0 bs=128k
> +
> +  # # Copy the rest of the boot binaries
> +  # mount /dev/mmcblk0p1 /boot/firmware
> +  # cp tispl.bin /boot/firmware
> +  # cp u-boot.img /boot/firmware
> +  # sync
> +
> +.. warning ::
> +
> +  The U-Boot is configured to prioritize booting from an SD card if
> +  it detects a valid boot partition and boot files on it, even if the
> +  system initially booted from eMMC. The boot order is set as follows:
> +
> +  * SD/MMC
> +  * eMMC
> +  * USB
> +  * PXE
> +
> +LED patterns during boot
> +------------------------
> +
> +.. list-table:: USR LED status indication
> +   :widths: 16 16
> +   :header-rows: 1
> +
> +   * - USR LEDs (012345)
> +     - Indicates
> +
> +   * - 00000
> +     - Boot failure or R5 image not started up
> +
> +   * - 11111
> +     - A53 SPL/U-boot has started up
> +
> +   * - 10101
> +     - OS boot process has been initiated
> +
> +   * - 01010
> +     - OS boot process failed and drops to U-Boot shell
> +
> +.. note ::
> +
> +  In the table above, 0 indicates LED switched off and 1 indicates LED
> +  switched ON.
> +
> +.. warning ::
> +
> +  If the "red" power LED is not glowing, the system power supply is not
> +  functional. Please refer to `BeaglePlay documentation
> +  <https://beagleplay.org/>`_ for further information.
> +
> +A53 SPL DDR Memory Layout
> +-------------------------
> +
> +.. include::  am62x_sk.rst
> +    :start-after: .. am62x_evm_rst_include_start_ddr_mem_layout
> +    :end-before: .. am62x_evm_rst_include_end_ddr_mem_layout
> +
> +Switch Setting for Boot Mode
> +----------------------------
> +
> +The boot time option is configured via "USR" button on the board.
> +See `Beagleplay Schematics <https://git.beagleboard.org/beagleplay/beagleplay/-/blob/main/BeaglePlay_sch.pdf>`_
> +for details.
> +
> +.. list-table:: Boot Modes
> +   :widths: 16 16 16
> +   :header-rows: 1
> +
> +   * - USR Switch Position
> +     - Primary Boot
> +     - Secondary Boot
> +
> +   * - Not Pressed
> +     - eMMC
> +     - UART
> +
> +   * - Pressed
> +     - SD/MMC File System (FS) mode
> +     - USB Device Firmware Upgrade (DFU) mode
> +
> +To switch to SD card boot mode, hold the USR button while powering on
> +with Type-C power supply, then release when power LED lights up.
> +
> +Debugging U-Boot
> +----------------
> +
> +See :ref:`Common Debugging environment - OpenOCD<k3_rst_refer_openocd>`: for
> +detailed setup and debugging information.
> +
> +.. warning::
> +
> +  **OpenOCD support since**: v0.12.0
> +
> +  If the default package version of OpenOCD in your development
> +  environment's distribution needs to be updated, it might be necessary to
> +  build OpenOCD from the source.
> +
> +.. include::  k3.rst
> +    :start-after: .. k3_rst_include_start_openocd_connect_tag_connect
> +    :end-before: .. k3_rst_include_end_openocd_connect_tag_connect
> +
> +.. include::  k3.rst
> +    :start-after: .. k3_rst_include_start_openocd_cfg_external_intro
> +    :end-before: .. k3_rst_include_end_openocd_cfg_external_intro
> +
> +For example, with BeaglePlay (AM62X platform), the openocd_connect.cfg:
> +
> +.. code-block:: tcl
> +
> +  # TUMPA example:
> +  # http://www.tiaowiki.com/w/TIAO_USB_Multi_Protocol_Adapter_User's_Manual
> +  source [find interface/ftdi/tumpa.cfg]
> +
> +  transport select jtag
> +
> +  # default JTAG configuration has only SRST and no TRST
> +  reset_config srst_only srst_push_pull
> +
> +  # delay after SRST goes inactive
> +  adapter srst delay 20
> +
> +  if { ![info exists SOC] } {
> +    # Set the SoC of interest
> +    set SOC am625
> +  }
> +
> +  source [find target/ti_k3.cfg]
> +
> +  ftdi tdo_sample_edge falling
> +
> +  # Speeds for FT2232H are in multiples of 2, and 32MHz is tops
> +  # max speed we seem to achieve is ~20MHz.. so we pick 16MHz
> +  adapter speed 16000
> diff --git a/doc/board/ti/img/beagleplay_emmc.svg b/doc/board/ti/img/beagleplay_emmc.svg
> new file mode 100644
> index 000000000000..2dec871d6fdd
> --- /dev/null
> +++ b/doc/board/ti/img/beagleplay_emmc.svg
> @@ -0,0 +1,697 @@
> +<?xml version="1.0" encoding="UTF-8" standalone="no"?>
> +<!--SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause-->
> +
> +<!--Copyright (C) 2023 Texas Instruments Incorporated - https://www.ti.com/-->
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> +             style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 128px; height: 1px; padding-top: 265px; margin-left: 391px;">
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> +                 style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">uEnv.txt / boot.scr<xhtml:br />
> +(optional)</xhtml:div>
> +            </xhtml:div>
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> +            <xhtml:div
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> +                 style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">UDA partitions</xhtml:div>
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> +           id="text126">UDA partit...</text>
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> +       transform="translate(0,-5)"
> +       xlink:href="https://www.diagrams.net/doc/faq/svg-export-text-problems"
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> +       id="a138">
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> diff --git a/doc/board/ti/k3.rst b/doc/board/ti/k3.rst
> index 5f9bd4dfcbe9..ef31ccd12a42 100644
> --- a/doc/board/ti/k3.rst
> +++ b/doc/board/ti/k3.rst
> @@ -30,6 +30,7 @@ K3 Based SoCs
>  .. toctree::
>     :maxdepth: 1
>  
> +   am62x_beagleplay
>     am62x_sk
>     ../toradex/verdin-am62
>     am64x_evm
> -- 
> 2.40.0


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