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d9252fcde1
Replace the board specific docs with a generic board.rst file which documents the build/boot process for the sdm845 and qcs404 boards now that the only differences are the DTB in use. At the same time, create a debugging page to document some useful snippets and tips for working with Qualcomm platforms. Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
61 lines
1.6 KiB
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61 lines
1.6 KiB
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.. SPDX-License-Identifier: GPL-2.0+
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.. sectionauthor:: Caleb Connolly <caleb.connolly@linaro.org>
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Qualcomm debugging
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==================
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About this
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----------
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This page describes how to enable early UART and other debugging techniques
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for Qualcomm boards.
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Enable debug UART
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-----------------
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Newer boards (SDM845 and newer, those with GENI SE UART)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Open ``configs/qcom_defconfig`` and add the following snippet to the bottom:
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CONFIG_BAUDRATE=115200
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# Uncomment to enable UART pre-relocation
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CONFIG_DEBUG_UART=y
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CONFIG_DEBUG_UART_ANNOUNCE=y
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# This is the address of the debug-uart peripheral
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# The value here is for SDM845, other platforms will vary
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CONFIG_DEBUG_UART_BASE=0xa84000
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# Boards older than ~2018 pre-date the GENI driver and unfortunately
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# aren't supported here
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CONFIG_DEBUG_UART_MSM_GENI=y
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# For sdm845 this is the UART clock rate
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CONFIG_DEBUG_UART_CLOCK=7372800
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# Most newer boards have an oversampling value of 16 instead
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# of 32, they need the clock rate to be doubled
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#CONFIG_DEBUG_UART_CLOCK=14745600
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Then build as normal (don't forget to ``make qcom_defconfig``` again).
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Older boards (db410c and db820c)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Open ``configs/dragonboard<BOARD>_defconfig``
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CONFIG_BAUDRATE=115200
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CONFIG_DEBUG_UART=y
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CONFIG_DEBUG_UART_ANNOUNCE=y
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# db410c - 0x78b0000
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# db820c - 0x75b0000
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CONFIG_DEBUG_UART_BASE=0x75b0000
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CONFIG_DEBUG_UART_MSM=y
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CONFIG_DEBUG_UART_CLOCK=7372800
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#CONFIG_DEBUG_UART_SKIP_INIT=y
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CONFIG_LOG=y
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CONFIG_HEXDUMP=y
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CONFIG_CMD_LOG=y
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CONFIG_LOG_MAX_LEVEL=9
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CONFIG_LOG_DEFAULT_LEVEL=9
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CONFIG_LOGLEVEL=9
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