[PATCH V4] doc: board: ti: k3: Add a guide to debugging with OpenOCD
Nishanth Menon
nm at ti.com
Thu Aug 3 08:29:22 CEST 2023
From: Jason Kacines <j-kacines at ti.com>
Bootloader debug usually tends to be a bit dicey prior to DDR and
serial port getting active in the system. JTAG typically remains the
only practical debug option during the initial bringup.
OpenOCD is one of the most popular environment for providing debug
capability via a GDB compatible interface for developers to work with.
Debugging U-Boot and bootloaders on K3 platform does have a bit of
tribal knowledge that is better documented in our common platform
documentation.
Signed-off-by: Jason Kacines <j-kacines at ti.com>
Signed-off-by: Nishanth Menon <nm at ti.com>
---
Changes from V3:
* Thank you Heinrich for very detailed comments - I think I have
addressed them here, if there are any misses, will fix.
* Additional change I did was to include relocaddr for symbol load
and refer to doc/README.arm-relocation for details on how to do.
This unfortunately trips a lot more people than I had expected,
but I hope I do some justice here.
* Side note: I am a bit miffed at https://github.com/openocd-org/openocd/commit/cc2d4f015f72d7c30d613b50572eb9f31fac515a#diff-1ef184bd71bdf218f418818e8d03cc07c86b1c0838bff934e9f3adc7b7a2ee01
dropping build instructions.. but anyways, it was too
outdated anyways, the libjaylink etc are git submodules that bootstrap
updates and build uses locally unlike debian source build system, but
then we end up in the weeds if we try to add all details, so i added
your suggestion as well.
Diff of changes Vs V3 is here:
https://gist.github.com/nmenon/3487697a1c12c78d4ec34dbe6c4575b6
V3: https://lore.kernel.org/all/20230801174115.1318331-1-nm@ti.com/
V2: https://lore.kernel.org/all/20230729204500.31823-1-nm@ti.com/
V1: https://lore.kernel.org/u-boot/20230721191934.1959003-1-j-kacines@ti.com/
doc/board/ti/am62x_sk.rst | 24 ++
doc/board/ti/am65x_evm.rst | 24 ++
doc/board/ti/img/openocd-overview.svg | 580 ++++++++++++++++++++++++++
doc/board/ti/j7200_evm.rst | 24 ++
doc/board/ti/j721e_evm.rst | 24 ++
doc/board/ti/k3.rst | 514 +++++++++++++++++++++++
6 files changed, 1190 insertions(+)
create mode 100644 doc/board/ti/img/openocd-overview.svg
diff --git a/doc/board/ti/am62x_sk.rst b/doc/board/ti/am62x_sk.rst
index 637985cb096e..d720f84df3b0 100644
--- a/doc/board/ti/am62x_sk.rst
+++ b/doc/board/ti/am62x_sk.rst
@@ -246,3 +246,27 @@ https://www.ti.com/lit/pdf/spruiv7 under the `Boot Mode Pins` section.
- 11001010
For SW2 and SW1, the switch state in the "ON" position = 1.
+
+Debugging U-Boot
+----------------
+
+See :ref:`Common Debugging environment - OpenOCD<k3_rst_refer_openocd>`: for
+detailed setup 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_XDS110
+ :end-before: .. k3_rst_include_end_openocd_connect_XDS110
+
+To start OpenOCD and connect to the board
+
+.. code-block:: bash
+
+ openocd -f board/ti_am625evm.cfg
diff --git a/doc/board/ti/am65x_evm.rst b/doc/board/ti/am65x_evm.rst
index 0129235c2b29..26dab3113471 100644
--- a/doc/board/ti/am65x_evm.rst
+++ b/doc/board/ti/am65x_evm.rst
@@ -287,3 +287,27 @@ artifacts needed to the device:
sb --ymodem tispl.bin > $MAIN_DEV < $MAIN_DEV
sleep 1
sb --xmodem u-boot.img > $MAIN_DEV < $MAIN_DEV
+
+Debugging U-Boot
+----------------
+
+See :ref:`Common Debugging environment - OpenOCD<k3_rst_refer_openocd>`: for
+detailed setup 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_XDS110
+ :end-before: .. k3_rst_include_end_openocd_connect_XDS110
+
+To start OpenOCD and connect to the board
+
+.. code-block:: bash
+
+ openocd -f board/ti_am654evm.cfg
diff --git a/doc/board/ti/img/openocd-overview.svg b/doc/board/ti/img/openocd-overview.svg
new file mode 100644
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@@ -0,0 +1,580 @@
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+ </switch>
+ </g>
+ <path
+ d="M 140 80 L 140 113.63"
+ fill="none"
+ stroke="rgb(0, 0, 0)"
+ stroke-miterlimit="10"
+ pointer-events="none"
+ id="path106" />
+ <path
+ d="M 140 118.88 L 136.5 111.88 L 140 113.63 L 143.5 111.88 Z"
+ fill="rgb(0, 0, 0)"
+ stroke="rgb(0, 0, 0)"
+ stroke-miterlimit="10"
+ pointer-events="none"
+ id="path108" />
+ <path
+ d="M 80 0 L 200 0 L 200 68 Q 170 46.4 140 68 Q 110 89.6 80 68 L 80 12 Z"
+ fill="#e1d5e7"
+ stroke="#9673a6"
+ stroke-miterlimit="10"
+ pointer-events="none"
+ id="path110" />
+ <g
+ transform="translate(-0.5 -0.5)"
+ id="g116">
+ <switch
+ id="switch114">
+ <foreignObject
+ style="overflow: visible; text-align: left;"
+ pointer-events="none"
+ width="100%"
+ height="100%"
+ requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility">
+ <xhtml:div
+ style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 28px; margin-left: 81px;">
+ <xhtml:div
+ style="box-sizing: border-box; font-size: 0px; text-align: center;"
+ data-drawio-colors="color: rgb(0, 0, 0); ">
+ <xhtml:div
+ style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: none; white-space: normal; overflow-wrap: normal;">IDE debugging code</xhtml:div>
+ </xhtml:div>
+ </xhtml:div>
+ </foreignObject>
+ <text
+ x="140"
+ y="32"
+ fill="rgb(0, 0, 0)"
+ font-family="Helvetica"
+ font-size="12px"
+ text-anchor="middle"
+ id="text112">IDE debugging code</text>
+ </switch>
+ </g>
+ </g>
+</svg>
diff --git a/doc/board/ti/j7200_evm.rst b/doc/board/ti/j7200_evm.rst
index 69abc55a93ce..c1c1ec553863 100644
--- a/doc/board/ti/j7200_evm.rst
+++ b/doc/board/ti/j7200_evm.rst
@@ -201,3 +201,27 @@ fat formatted UDA FS as file.
In case of booting from eMMC, write above images into raw or UDA FS.
and set mmc partconf accordingly.
+
+Debugging U-Boot
+----------------
+
+See :ref:`Common Debugging environment - OpenOCD<k3_rst_refer_openocd>`: for
+detailed setup 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_XDS110
+ :end-before: .. k3_rst_include_end_openocd_connect_XDS110
+
+To start OpenOCD and connect to the board
+
+.. code-block:: bash
+
+ openocd -f board/ti_j7200evm.cfg
diff --git a/doc/board/ti/j721e_evm.rst b/doc/board/ti/j721e_evm.rst
index f4b4c192d9da..735a0ce0e77e 100644
--- a/doc/board/ti/j721e_evm.rst
+++ b/doc/board/ti/j721e_evm.rst
@@ -228,3 +228,27 @@ J721E common processor board can be attached to a Ethernet QSGMII card and the
PHY in the card has to be reset before it can be used for data transfer.
"do_main_cpsw0_qsgmii_phyinit" env variable has to be set for the U-BOOT to
configure this PHY.
+
+Debugging U-Boot
+----------------
+
+See :ref:`Common Debugging environment - OpenOCD<k3_rst_refer_openocd>`: for
+detailed setup 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_XDS110
+ :end-before: .. k3_rst_include_end_openocd_connect_XDS110
+
+To start OpenOCD and connect to the board
+
+.. code-block:: bash
+
+ openocd -f board/ti_j721eevm.cfg
diff --git a/doc/board/ti/k3.rst b/doc/board/ti/k3.rst
index 2034002af7cb..19a7123d610f 100644
--- a/doc/board/ti/k3.rst
+++ b/doc/board/ti/k3.rst
@@ -468,3 +468,517 @@ filesystem and then imported
=> fatload mmc ${mmcdev} ${loadaddr} ${bootenvfile}
=> env import -t ${loadaddr} ${filesize}
+
+.. _k3_rst_refer_openocd:
+
+Common Debugging environment - OpenOCD
+--------------------------------------
+
+This section will show you how to connect a board to `OpenOCD
+<https://openocd.org/>`_ and load the SPL symbols for debugging with
+a K3 generation device. To follow this guide, you must build custom
+u-boot binaries, start your board from a boot media such as an SD
+card, and use an OpenOCD environment. This section uses generic
+examples, though you can apply these instructions to any supported K3
+generation device.
+
+The overall structure of this setup is in the following figure.
+
+.. image:: img/openocd-overview.svg
+
+.. note::
+
+ If you find these instructions useful, please consider `donating
+ <https://openocd.org/pages/donations.html>`_ to OpenOCD.
+
+Step 1: Download and install OpenOCD
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+To get started, it is more convenient if the distribution you
+use supports OpenOCD by default. Follow the instructions in the
+`getting OpenOCD <https://openocd.org/pages/getting-openocd.html>`_
+documentation to pick the installation steps appropriate to your
+environment. Some references to OpenOCD documentation:
+
+* `OpenOCD User Guide <https://openocd.org/doc/html/index.html>`_
+* `OpenOCD Developer's Guide <https://openocd.org/doc/doxygen/html/index.html>`_
+
+Refer to the release notes corresponding to the `OpenOCD version
+<https://github.com/openocd-org/openocd/releases>`_ to ensure
+
+* Processor support: In general, processor support shouldn't present
+ any difficulties since OpenOCD provides solid support for both ARMv8
+ and ARMv7.
+* SoC support: When working with System-on-a-Chip (SoC), the support
+ usually comes as a TCL config file. It is vital to ensure the correct
+ version of OpenOCD or to use the TCL files from the latest release or
+ the one mentioned.
+* Board or the JTAG adapter support: In most cases, board support is
+ a relatively easy problem if the board has a JTAG pin header. All
+ you need to do is ensure that the adapter you select is compatible
+ with OpenOCD. Some boards come with an onboard JTAG adapter that
+ requires a USB cable to be plugged into the board, in which case, it
+ is vital to ensure that the JTAG adapter is supported. Fortunately,
+ almost all TI K3 SK/EVMs come with TI's XDS110, which has out of the
+ box support by OpenOCD. The board-specific documentation will
+ cover the details and any adapter/dongle recommendations.
+
+.. code-block:: bash
+
+ openocd -v
+
+.. note::
+
+ OpenOCD version 0.12.0 is usually required to connect to most K3
+ devices. If your device is only supported by a newer version than the
+ one provided by your distribution, you may need to build it from the source.
+
+Building OpenOCD from source
+""""""""""""""""""""""""""""
+
+The dependency package installation instructions below are for Debian
+systems, but equivalent instructions should exist for systems with
+other package managers. Please refer to the `OpenOCD Documentation
+<https://openocd.org/>`_ for more recent installation steps.
+
+.. code-block:: bash
+
+ $ # Check the packages to be installed: needs deb-src in sources.list
+ $ sudo apt build-dep openocd
+ $ # The following list is NOT complete - please check the latest
+ $ sudo apt-get install libtool pkg-config texinfo libusb-dev \
+ libusb-1.0.0-dev libftdi-dev libhidapi-dev autoconf automake
+ $ git clone https://github.com/openocd-org/openocd.git openocd
+ $ cd openocd
+ $ git submodule init
+ $ git submodule update
+ $ ./bootstrap
+ $ ./configure --prefix=/usr/local/
+ $ make -j`nproc`
+ $ sudo make install
+
+.. note::
+
+ The example above uses the GitHub mirror site. See
+ `git repo information <https://openocd.org/doc/html/Developers.html#OpenOCD-Git-Repository>`_
+ information to pick the official git repo.
+ If a specific version is desired, select the version using `git checkout tag`.
+
+Installing OpenOCD udev rules
+"""""""""""""""""""""""""""""
+
+The step is not necessary if the distribution supports the OpenOCD, but
+if building from a source, ensure that the udev rules are installed
+correctly to ensure a sane system.
+
+.. code-block:: bash
+
+ # Go to the OpenOCD source directory
+ $ cd openocd
+ # Copy the udev rules to the correct system location
+ $ sudo cp ./contrib/60-openocd.rules \
+ ./src/JTAG/drivers/libjaylink/contrib/99-libjaylink.rules \
+ /etc/udev/rules.d/
+ # Get Udev to load the new rules up
+ $ sudo udevadm control --reload-rules
+ # Use the new rules on existing connected devices
+ $ sudo udevadm trigger
+
+Step 2: Setup GDB
+^^^^^^^^^^^^^^^^^
+
+Most systems come with gdb-multiarch package.
+
+.. code-block:: bash
+
+ # Install gdb-multiarch package
+ $ sudo apt-get install gdb-multiarch
+
+Though using GDB natively is normal, developers with interest in using IDE
+may find a few of these interesting:
+
+* `gdb-dashboard <https://github.com/cyrus-and/gdb-dashboard>`_
+* `gef <https://github.com/hugsy/gef>`_
+* `peda <https://github.com/longld/peda>`_
+* `pwndbg <https://github.com/pwndbg/pwndbg>`_
+* `voltron <https://github.com/snare/voltron>`_
+* `ddd <https://www.gnu.org/software/ddd/>`_
+* `vscode <https://www.justinmklam.com/posts/2017/10/vscode-debugger-setup/>`_
+* `vim conque-gdb <https://github.com/vim-scripts/Conque-GDB>`_
+* `emacs realgud <https://github.com/realgud/realgud/wiki/gdb-notes>`_
+* `Lauterbach IDE <https://www2.lauterbach.com/pdf/backend_gdb.pdf>`_
+
+.. warning::
+ LLDB support for OpenOCD is still a work in progress as of this writing.
+ Using GDB is probably the safest option at this point in time.
+
+Step 3: Connect board to PC
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+There are few patterns of boards in the ecosystem
+
+.. k3_rst_include_start_openocd_connect_XDS110
+
+**Integrated JTAG adapter/dongle**: The board has a micro-USB connector labelled
+XDS110 USB or JTAG. Connect a USB cable to the board to the mentioned port.
+
+.. note::
+
+ There are multiple USB ports on a typical board, So, ensure you have read
+ the user guide for the board and confirmed the silk screen label to ensure
+ connecting to the correct port.
+
+.. k3_rst_include_end_openocd_connect_XDS110
+
+.. k3_rst_include_start_openocd_connect_cti20
+
+**cTI20 connector**: The TI's `cTI20
+<https://software-dl.ti.com/ccs/esd/documents/xdsdebugprobes/emu_JTAG_connectors.html#cti-20-pin-header-information>`_ connector
+is probably the most prevelant on TI platforms. Though many
+TI boards have an onboard XDS110, cTI20 connector is usually
+provided as an alternate scheme to connect alternatives such
+as `Lauterbach <https://www.lauterbach.com/>`_ or `XDS560
+<https://www.ti.com/tool/TMDSEMU560V2STM-U>`_.
+
+To debug on these boards, the following combinations is suggested:
+
+* `TUMPA <https://www.diygadget.com/JTAG-cables-and-microcontroller-programmers/tiao-usb-multi-protocol-adapter-JTAG-spi-i2c-serial>`_
+ or `equivalent dongles supported by OpenOCD. <https://openocd.org/doc/html/Debug-Adapter-Hardware.html#Debug-Adapter-Hardware>`_
+* Cable such as `Tag-connect ribbon cable <https://www.tag-connect.com/product/20-pin-cortex-ribbon-cable-4-length-with-50-mil-connectors>`_
+* Adapter to convert cTI20 to ARM20 such as those from
+ `Segger <https://www.segger.com/products/debug-probes/j-link/accessories/adapters/ti-cti-20-adapter/>`_
+ or `Lauterbach LA-3780 <https://www.lauterbach.com/ad3780.html>`_
+ Or optionally, if you have manufacturing capability then you could try
+ `BeagleBone JTAG Adapter <https://github.com/mmorawiec/BeagleBone-Black-JTAG-Adapters>`_
+
+.. warning::
+ XDS560 and Lauterbach are proprietary solutions and is not supported by
+ OpenOCD.
+ When purchasing an off the shelf adapter/dongle, you do want to be careful
+ about the signalling though. Please
+ `read for additional info <https://software-dl.ti.com/ccs/esd/xdsdebugprobes/emu_JTAG_connectors.html>`_.
+
+.. k3_rst_include_end_openocd_connect_cti20
+
+.. k3_rst_include_start_openocd_connect_tag_connect
+
+**Tag-Connect**: `Tag-Connect <https://www.tag-connect.com/>`_
+pads on the boards which require special cable. Please check the documentation
+to `identify <https://www.tag-connect.com/info/legs-or-no-legs>`_ if "legged"
+or "no-leg" version of the cable is appropriate for the board.
+
+To debug on these boards, you will need:
+
+* `TUMPA <https://www.diygadget.com/JTAG-cables-and-microcontroller-programmers/tiao-usb-multi-protocol-adapter-JTAG-spi-i2c-serial>`_
+ or `equivalent dongles supported by OpenOCD <https://openocd.org/doc/html/Debug-Adapter-Hardware.html#Debug-Adapter-Hardware>`_.
+* Tag-Connect cable appropriate to the board such as
+ `TC2050-IDC-NL <https://www.tag-connect.com/product/TC2050-IDC-NL-10-pin-no-legs-cable-with-ribbon-connector>`_
+* In case of no-leg, version, a
+ `retaining clip <https://www.tag-connect.com/product/tc2050-clip-3pack-retaining-clip>`_
+* Tag-Connect to ARM20
+ `adapter <https://www.tag-connect.com/product/tc2050-arm2010-arm-20-pin-to-tc2050-adapter>`_
+
+.. note::
+ You can optionally use a 3d printed solution such as
+ `Protective cap <https://www.thingiverse.com/thing:3025584>`_ or
+ `clip <https://www.thingiverse.com/thing:3035278>`_ to replace
+ the retaining clip.
+
+.. warning::
+ With the Tag-Connect to ARM20 adapter, Please solder the "Trst" signal for
+ connection to work.
+
+.. k3_rst_include_end_openocd_connect_tag_connect
+
+Debugging with OpenOCD
+^^^^^^^^^^^^^^^^^^^^^^
+
+Debugging U-Boot is different from debugging regular user space
+applications. The bootloader initialization process involves many boot
+media and hardware configuration operations. For K3 devices, there
+are also interactions with security firmware. While reloading the
+"elf" file works through GDB, developers must be mindful of cascading
+initialization's potential consequences.
+
+Consider the following code change:
+
+.. code-block:: diff
+
+ --- a/file.c 2023-07-29 10:55:29.647928811 -0500
+ +++ b/file.c 2023-07-29 10:55:46.091856816 -0500
+ @@ -1,3 +1,3 @@
+ val = readl(reg);
+ -val |= 0x2;
+ +val |= 0x1;
+ writel(val, reg);
+
+Re-running the elf file with the above change will result in the
+register setting 0x3 instead of the intended 0x1. There are other
+hardware blocks which may not behave very well with a re-initialization
+without proper shutdown.
+
+To help narrow the debug down, it is usually simpler to use the
+standard boot media to get to the bootloader and debug only in the area
+of interest.
+
+In general, to debug u-boot spl/u-boot with OpenOCD there are three steps:
+
+* Modify the code adding a loop to allow the debugger to attach
+ near the point of interest. Boot up normally to stop at the loop.
+* Connect with OpenOCD and step out of the loop.
+* Step through the code to find the root of issue.
+
+Typical debugging involves a few iterations of the above sequence.
+Though most bootloader developers like to use printf to debug,
+debug with JTAG tends to be most efficient since it is possible to
+investigate the code flow and inspect hardware registers without
+repeated iterations.
+
+Code modification
+"""""""""""""""""
+
+* **start.S**: Adding an infinite while loop at the very entry of
+ U-Boot. For this, look for the corresponding start.S entry file.
+ This is usually only required when debugging some core SoC or
+ processor related function. For example: arch/arm/cpu/armv8/start.S or
+ arch/arm/cpu/armv7/start.S
+
+.. code-block:: diff
+
+ diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
+ index 69e281b086..744929e825 100644
+ --- a/arch/arm/cpu/armv7/start.S
+ +++ b/arch/arm/cpu/armv7/start.S
+ @@ -37,6 +37,8 @@
+ #endif
+
+ reset:
+ +dead_loop:
+ + b dead_loop
+ /* Allow the board to save important registers */
+ b save_boot_params
+ save_boot_params_ret:
+
+* **board_init_f**: Adding an infinite while loop at the board entry
+ function. In many cases, it is important to debug the boot process if
+ any changes are made for board-specific applications. Below is a step
+ by step process for debugging the boot SPL or Armv8 SPL:
+
+ To debug the boot process in either domain, we will first
+ add a modification to the code we would like to debug.
+ In this example, we will debug ``board_init_f`` inside
+ ``arch/arm/mach-k3/{soc}_init.c``. Since some sections of U-Boot
+ will be executed multiple times during the bootup process of K3
+ devices, we will need to include either ``CONFIG_CPU_ARM64`` or
+ ``CONFIG_CPU_V7R`` to catch the CPU at the desired place during the
+ bootup process (Main or Wakeup domains). For example, modify the
+ file as follows (depending on need):
+
+.. code-block:: c
+
+ void board_init_f(ulong dummy)
+ {
+ .
+ .
+ /* Code to run on the R5F (Wakeup/Boot Domain) */
+ if (IS_ENABLED(CONFIG_CPU_V7R)) {
+ volatile int x = 1;
+ while(x) {};
+ }
+ ...
+ /* Code to run on the ARMV8 (Main Domain) */
+ if (IS_ENABLED(CONFIG_CPU_ARM64)) {
+ volatile int x = 1;
+ while(x) {};
+ }
+ .
+ .
+ }
+
+Connecting with OpenOCD for a debug session
+"""""""""""""""""""""""""""""""""""""""""""
+
+Startup OpenOCD to debug the platform as follows:
+
+* **Integrated JTAG interface**: If the evm has a debugger such as
+ XDS110 inbuilt, there is typically an evm board support added and a
+ cfg file will be available.
+
+.. k3_rst_include_start_openocd_cfg_XDS110
+
+.. code-block:: bash
+
+ openocd -f board/{board_of_choice}.cfg
+
+.. k3_rst_include_end_openocd_cfg_XDS110
+
+.. k3_rst_include_start_openocd_cfg_external_intro
+
+* **External JTAG adapter/interface**: In other cases, where an
+ adapter/dongle is used, a simple cfg file can be created to integrate the
+ SoC and adapter information. See `supported TI K3 SoCs
+ <https://github.com/openocd-org/openocd/blob/master/tcl/target/ti_k3.cfg#L59>`_
+ to decide if the SoC is supported or not.
+
+.. code-block:: bash
+
+ openocd -f openocd_connect.cfg
+
+.. 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
+
+Below is an example of the output of this command:
+
+.. code-block:: console
+
+ Info : Listening on port 6666 for tcl connections
+ Info : Listening on port 4444 for telnet connections
+ Info : XDS110: connected
+ Info : XDS110: vid/pid = 0451/bef3
+ Info : XDS110: firmware version = 3.0.0.20
+ Info : XDS110: hardware version = 0x002f
+ Info : XDS110: connected to target via JTAG
+ Info : XDS110: TCK set to 2500 kHz
+ Info : clock speed 2500 kHz
+ Info : JTAG tap: am625.cpu tap/device found: 0x0bb7e02f (mfg: 0x017 (Texas Instruments), part: 0xbb7e, ver: 0x0)
+ Info : starting gdb server for am625.cpu.sysctrl on 3333
+ Info : Listening on port 3333 for gdb connections
+ Info : starting gdb server for am625.cpu.a53.0 on 3334
+ Info : Listening on port 3334 for gdb connections
+ Info : starting gdb server for am625.cpu.a53.1 on 3335
+ Info : Listening on port 3335 for gdb connections
+ Info : starting gdb server for am625.cpu.a53.2 on 3336
+ Info : Listening on port 3336 for gdb connections
+ Info : starting gdb server for am625.cpu.a53.3 on 3337
+ Info : Listening on port 3337 for gdb connections
+ Info : starting gdb server for am625.cpu.main0_r5.0 on 3338
+ Info : Listening on port 3338 for gdb connections
+ Info : starting gdb server for am625.cpu.gp_mcu on 3339
+ Info : Listening on port 3339 for gdb connections
+
+.. note::
+ Notice the default configuration is non-SMP configuration allowing
+ for each of the core to be attached and debugged simultaneously.
+ ARMv8 SPL/U-Boot starts up on cpu0 of a53/a72.
+
+.. k3_rst_include_start_openocd_cfg_external_gdb
+
+To debug using this server, use GDB directly or your preferred
+GDB-based IDE. To start up GDB in the terminal, run the following
+command.
+
+.. code-block:: bash
+
+ gdb-multiarch
+
+To connect to your desired core, run the following command within GDB:
+
+.. code-block:: bash
+
+ target extended-remote localhost:{port for desired core}
+
+To load symbols:
+
+.. warning::
+
+ SPL and U-Boot does a re-location of address compared to where it
+ is loaded originally. This step takes place after the DDR size is
+ determined from dt parsing. So, debugging can be split into either
+ "before re-location" or "after re-location". Please refer to the
+ file ''doc/README.arm-relocation'' to see how to grab the relocation
+ address.
+
+* Prior to relocation:
+
+.. code-block:: bash
+
+ symbol-file {path to elf file}
+
+* After relocation:
+
+.. code-block:: bash
+
+ # Drop old symbol file
+ symbol-file
+ # Pick up new relocaddr
+ add-symbol-file {path to elf file} {relocaddr}
+
+.. k3_rst_include_end_openocd_cfg_external_gdb
+
+In the above example of AM625,
+
+.. code-block:: bash
+
+ target extended-remote localhost:3338 <- R5F (Wakeup Domain)
+ target extended-remote localhost:3334 <- A53 (Main Domain)
+
+The core can now be debugged directly within GDB using GDB commands or
+if using IDE, as appropriate to the IDE.
+
+Stepping through the code
+"""""""""""""""""""""""""
+
+`GDB TUI Commands
+<https://sourceware.org/gdb/onlinedocs/gdb/TUI-Commands.html>`_ can
+help set up the display more sensible for debug. Provide the name
+of the layout that can be used to debug. For example, use the GDB
+command ``layout src`` after loading the symbols to see the code and
+breakpoints. To exit the debug loop added above, add any breakpoints
+needed and run the following GDB commands to step out of the debug
+loop set in the ``board_init_f`` function.
+
+.. code-block:: bash
+
+ set x = 0
+ continue
+
+The platform has now been successfully setup to debug with OpenOCD
+using GDB commands or a GDB-based IDE. See `OpenOCD documentation for
+GDB <https://openocd.org/doc/html/GDB-and-OpenOCD.html>`_ for further
+information.
+
+.. warning::
+
+ On the K3 family of devices, a watchdog timer within the DMSC is
+ enabled by default by the ROM bootcode with a timeout of 3 minutes.
+ The watchdog timer is serviced by System Firmware (SYSFW) or TI
+ Foundational Security (TIFS) during normal operation. If debugging
+ the SPL before the SYSFW is loaded, the watchdog timer will not get
+ serviced automatically and the debug session will reset after 3
+ minutes. It is recommended to start debugging SPL code only after
+ the startup of SYSFW to avoid running into the watchdog timer reset.
+
+Miscellaneous notes with OpenOCD
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Currently, OpenOCD does not support tracing for K3 platforms. Tracing
+function could be beneficial if the bug in code occurs deep within
+nested function and can optionally save developers major trouble of
+stepping through a large quantity of code.
--
2.40.0
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