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doc: board: Add document for DFU boot on am62x SoCs

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Both AM62 SK and beagleplay support DFU boot in a similar way now;
Document how to actually run DFU boot for both boards

Signed-off-by: Sjoerd Simons <sjoerd@collabora.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com> # on beagle play
Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
This commit is contained in:
Sjoerd Simons
2024-05-06 15:38:46 +01:00
committed by Tom Rini
parent b00c2fe70a
commit def64b4937
2 changed files with 50 additions and 1 deletions
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14
doc/board/beagle/am62x_beagleplay.rst
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@@ -268,7 +268,19 @@ for details.
- 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.
with a USB type C power supply, then release when power LED lights up.
DFU based boot
--------------
To boot the board over DFU, ensure there is no SD card inserted with a
bootloader. Hold the USR switch while plugging into the type C to boot into DFU
mode. After power-on the build artifacts needs to be uploaded one by one with a
tool like dfu-util.
.. include:: ../ti/am62x_sk.rst
:start-after: .. am62x_evm_rst_include_start_dfu_boot
:end-before: .. am62x_evm_rst_include_end_dfu_boot
Debugging U-Boot
----------------

37
doc/board/ti/am62x_sk.rst
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@@ -105,6 +105,20 @@ Set the variables corresponding to this platform:
* 3.1 R5:
.. include:: ../ti/k3.rst
:start-after: .. k3_rst_include_start_build_steps_spl_r5
:end-before: .. k3_rst_include_end_build_steps_spl_r5
* 3.1.1 Alternative build of R5 for DFU boot:
As the SPL size can get too big when building with support for booting both
from local storage *and* DFU an extra config fragment should be used to enable
DFU support (and disable storage support)
.. prompt:: bash $
export UBOOT_CFG_CORTEXR="${UBOOT_CFG_CORTEXR} am62x_r5_usbdfu.config"
.. include:: ../ti/k3.rst
:start-after: .. k3_rst_include_start_build_steps_spl_r5
:end-before: .. k3_rst_include_end_build_steps_spl_r5
@@ -251,6 +265,29 @@ https://www.ti.com/lit/pdf/spruiv7 under the `Boot Mode Pins` section.
For SW2 and SW1, the switch state in the "ON" position = 1.
DFU based boot
--------------
To boot the board over DFU, set the switches to DFU mode and connect to the
USB type C DRD port on the board. After power-on the build artifacts needs to be
uploaded one by one with a tool like dfu-util.
.. am62x_evm_rst_include_start_dfu_boot
The initial ROM will have a DFU alt named `bootloader` for the initial R5 spl
upload. The next stages as exposed by U-Boot have target alts matching the name
of the artifacts, for these a USB reset has to be done after each upload.
When using dfu-util the following commands can be used to boot to a U-Boot shell:
.. prompt:: bash $
dfu-util -a bootloader -D tiboot3.bin
dfu-util -R -a tispl -D tispl.bin
dfu-util -R -a u-boot.img -D u-boot.img
.. am62x_evm_rst_include_end_dfu_boot
Debugging U-Boot
----------------