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Introducing basic support for Qualcomm IPQxxx based RDPs. Document the build and flashing steps. Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org> Signed-off-by: Varadarajan Narayanan <quic_varada@quicinc.com> Link: https://lore.kernel.org/r/20250226064505.1178054-2-quic_varada@quicinc.com Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
56 lines
2.3 KiB
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56 lines
2.3 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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.. sectionauthor:: Varadarajan Narayanan <quic_varada@quicinc.com>
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Qualcomm Reference Design Platform (RDP)
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========================================
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Qualcomm RDPs are development boards based on the Qualcomm IPQ series of
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SoCs. These SoCs are used as the application processors in WiFi router
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platforms. RDPs come in multiple variants with differences in storage
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medium (NOR, NAND, MMC), no. of USB and PCIe ports, n/w ports etc.
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.. _Qualcomm's product page: https://www.qualcomm.com/products/internet-of-things/networking/wi-fi-networks/networking-pro-series/qualcomm-networking-pro-820-platform
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Installation
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------------
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First, setup ``CROSS_COMPILE`` for aarch64. Then, build U-Boot for ``IPQ9574``::
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$ export CROSS_COMPILE=<aarch64 toolchain prefix>
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$ make qcom_ipq9574_mmc_defconfig
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$ make -j8
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This will build ``u-boot.elf`` in the configured output directory.
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Although the RDPs do not have secure boot set up by default, the firmware still
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expects firmware ELF images to be "signed". The signature does not provide any
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security in this case, but it provides the firmware with some required metadata.
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To "sign" ``u-boot.elf`` you can use e.g. `qtestsign`_::
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$ qtestsign -v6 aboot -o u-boot.mbn u-boot.elf
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Then install the resulting ``u-boot.mbn`` to the ``0:APPSBL`` partition
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on your device with::
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IPQ9574# tftpboot path/to/u-boot.mbn
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IPQ9574# mmc part (note down the start & end block no.s of '0:APPSBL' partition)
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IPQ9574# mmc erase <start blk no> <count>
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IPQ9574# mmc write $fileaddr <blk no> <count>
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U-Boot should be running after a reboot (``reset``).
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.. WARNING
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Boards with newer software versions would automatically go the emergency
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download (EDL) mode if U-Boot is not functioning as expected. If its a
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runtime failure at Uboot, the system will get reset (due to watchdog)
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and XBL will try to boot from next bank and if Bank B also doesn't have
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a functional image and is not booting fine, then the system will enter
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EDL. A tool like bkerler's `edl`_ can be used for flashing with the
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firehose loader binary appropriate for the board.
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Note that the support added is very basic. Restoring the original U-Boot
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on boards with older version of the software requires a debugger.
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.. _qtestsign: https://github.com/msm8916-mainline/qtestsign
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.. _edl: https://github.com/bkerler/edl
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