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.. SPDX-License-Identifier: GPL-2.0+
.. sectionauthor:: Caleb Connolly <caleb.connolly@linaro.org>
Qualcomm debugging
==================
About this
----------
This page describes how to enable early UART and other debugging techniques
for Qualcomm boards.
Enable debug UART
-----------------
Newer boards (SDM845 and newer, those with GENI SE UART)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Open ``configs/qcom_defconfig`` and add the following snippet to the bottom:
CONFIG_BAUDRATE=115200
# Uncomment to enable UART pre-relocation
CONFIG_DEBUG_UART=y
CONFIG_DEBUG_UART_ANNOUNCE=y
# This is the address of the debug-uart peripheral
# The value here is for SDM845, other platforms will vary
CONFIG_DEBUG_UART_BASE=0xa84000
# Boards older than ~2018 pre-date the GENI driver and unfortunately
# aren't supported here
CONFIG_DEBUG_UART_MSM_GENI=y
# For sdm845 this is the UART clock rate
CONFIG_DEBUG_UART_CLOCK=7372800
# Most newer boards have an oversampling value of 16 instead
# of 32, they need the clock rate to be doubled
#CONFIG_DEBUG_UART_CLOCK=14745600
Then build as normal (don't forget to ``make qcom_defconfig``` again).
Older boards (db410c and db820c)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Open ``configs/dragonboard<BOARD>_defconfig``
CONFIG_BAUDRATE=115200
CONFIG_DEBUG_UART=y
CONFIG_DEBUG_UART_ANNOUNCE=y
# db410c - 0x78b0000
# db820c - 0x75b0000
CONFIG_DEBUG_UART_BASE=0x75b0000
CONFIG_DEBUG_UART_MSM=y
CONFIG_DEBUG_UART_CLOCK=7372800
#CONFIG_DEBUG_UART_SKIP_INIT=y
CONFIG_LOG=y
CONFIG_HEXDUMP=y
CONFIG_CMD_LOG=y
CONFIG_LOG_MAX_LEVEL=9
CONFIG_LOG_DEFAULT_LEVEL=9
CONFIG_LOGLEVEL=9
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