[PATCH V5 17/17] doc: board: ti: Add BeaglePlay documentation
Nishanth Menon
nm at ti.com
Thu Aug 24 05:11:01 CEST 2023
Add base documentation for BeaglePlay
Reviewed-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
Signed-off-by: Nishanth Menon <nm at ti.com>
---
Cc: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
Changes Since V4:
- Just the verbage comment from Simon
V4: https://lore.kernel.org/r/20230822184135.2328409-9-nm@ti.com
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..8fbeb715c4a8
--- /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 or 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. The choice of keeping tiboot3.bin in boot0 or
+boot1 partition depends on A/B update requirements.
+
+.. 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 ::
+
+ 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..c6ff19b77384
--- /dev/null
+++ b/doc/board/ti/img/beagleplay_emmc.svg
@@ -0,0 +1,697 @@
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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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