The process here is almost identical to the Dragonboard 410c, we've come full circle!
Signed-off-by: Caleb Connolly caleb.connolly@linaro.org --- doc/board/qualcomm/rb3gen2.rst | 53 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+)
diff --git a/doc/board/qualcomm/rb3gen2.rst b/doc/board/qualcomm/rb3gen2.rst new file mode 100644 index 000000000000..4240606224f5 --- /dev/null +++ b/doc/board/qualcomm/rb3gen2.rst @@ -0,0 +1,53 @@ +.. SPDX-License-Identifier: GPL-2.0+ +.. sectionauthor:: Caleb Connolly caleb.connolly@linaro.org + +Qualcomm Robotics RB3 Gen 2 +=========================== + +The RB3 Gen 2 is a development board based on the Qualcomm QCM6490 SoC (a derivative +of SC7280). More information can be found on `Qualcomm's product page`_. + +U-Boot can be used as a replacement for Qualcomm's original EDK2 bootloader by +flashing it directly to the uefi_a (or _b) partition. + +.. _Qualcomm's product page: https://www.qualcomm.com/developer/hardware/rb3-gen-2-development-kit + +Installation +------------ +First, setup ``CROSS_COMPILE`` for aarch64. Then, build U-Boot for ``qcm6490``:: + + $ export CROSS_COMPILE=<aarch64 toolchain prefix> + $ make qcm6490_defconfig + $ make -j8 + +This will build ``u-boot.elf`` in the configured output directory. + +Although the RB3 Gen 2 does not have secure boot set up by default, +the firmware still expects firmware ELF images to be "signed". The signature +does not provide any security in this case, but it provides the firmware with +some required metadata. + +To "sign" ``u-boot.elf`` you can use e.g. `qtestsign`_:: + + $ qtestsign -v6 aboot -o u-boot.mbn u-boot.elf + +Then install the resulting ``u-boot.mbn`` to the ``uefi_a`` partition +on your device with ``fastboot flash uefi_a u-boot.mbn``. + +U-Boot should be running after a reboot (``fastboot reboot``). + +Note that fastboot is not yet supported in U-Boot on this board, as a result, +to flash back the original firmware, or new versoins of the U-Boot, EDL mode +must be used. This can be accessed by pressing the EDL mode button as described +in the Qualcomm Linux documentation. A tool like bkerler's `edl`_ can be used +for flashing with the firehose loader binary appropriate for the board. + +.. _qtestsign: https://github.com/msm8916-mainline/qtestsign +.. _edl: https://github.com/bkerler/edl + +Usage +----- + +The USB Type-A ports are connected via a PCIe USB hub, which is not supported yet. +However, the Type-C port can be used with a powered USB dock to connect peripherals +like a USB stick.