doc: board/qualcomm: document generic targets
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.
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 40b03d2..5a4bfbf 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -573,6 +573,7 @@
S: Maintained
F: arch/arm/mach-snapdragon/
F: configs/qcom_defconfig
+F: doc/board/qualcomm
F: drivers/button/button-qcom-pmic.c
F: drivers/clk/qcom/
F: drivers/gpio/msm_gpio.c
diff --git a/doc/board/qualcomm/board.rst b/doc/board/qualcomm/board.rst
new file mode 100644
index 0000000..3d08b88
--- /dev/null
+++ b/doc/board/qualcomm/board.rst
@@ -0,0 +1,119 @@
+.. SPDX-License-Identifier: GPL-2.0+
+.. sectionauthor:: Dzmitry Sankouski <dsankouski@gmail.com>
+
+Qualcomm generic boards
+=======================
+
+About this
+----------
+This document describes how to build and run U-Boot for Qualcomm generic
+boards. Right now the generic target supports the Snapdragon 845 SoC, however
+it's expected to support more SoCs going forward.
+
+SDM845 - hi-end qualcomm chip, introduced in late 2017.
+Mostly used in flagship phones and tablets of 2018.
+
+The current boot flow support loading u-boot as an Android boot image via
+Qualcomm's UEFI-based ABL (Android) Bootloader. The DTB used by U-Boot will
+be appended to the U-Boot image the same way as when booting Linux. U-Boot
+will then retrieve the DTB during init. This way the memory layout and KASLR
+offset will be populated by ABL.
+
+Installation
+------------
+Build
+^^^^^
+Setup ``CROSS_COMPILE`` for aarch64 and build U-Boot for your board::
+
+ $ export CROSS_COMPILE=<aarch64 toolchain prefix>
+ $ make <your board name here, see Boards section>_defconfig
+ $ make
+
+This will build ``u-boot-nodtb.bin`` in the configured output directory.
+
+Generate FIT image
+^^^^^^^^^^^^^^^^^^
+See doc/uImage.FIT for more details
+
+Pack android boot image
+^^^^^^^^^^^^^^^^^^^^^^^
+We'll assemble android boot image with ``u-boot-nodtb.bin`` instead of linux kernel,
+and FIT image instead of ``initramfs``. Android bootloader expect gzipped kernel
+with appended dtb, so let's mimic linux to satisfy stock bootloader.
+
+Boards
+------
+
+starqlte
+^^^^^^^^
+
+The starqltechn is a production board for Samsung S9 (SM-G9600) phone,
+based on the Qualcomm SDM845 SoC.
+
+This device is supported by the common qcom_defconfig.
+
+The DTB is called "starqltechn.dtb"
+
+More information can be found on the `Samsung S9 page`_.
+
+dragonboard845c
+^^^^^^^^^^^^^^^
+
+The dragonboard845c is a Qualcomm Robotics RB3 Development Platform, based on
+the Qualcomm SDM845 SoC.
+
+This device is supported by the common qcom_defconfig
+
+The DTB is called "dragonboard845c.dtb"
+
+More information can be found on the `DragonBoard 845c page`_.
+
+qcs404-evb
+^^^^^^^^^^
+
+The QCS404 EvB is a Qualcomm Development Platform, based on the Qualcomm QCS404 SoC.
+
+This device is supported by the common qcom_defconfig
+
+The DTB is called "qcs404-evb.dtb"
+
+Building steps
+--------------
+
+Steps:
+
+- Build u-boot::
+
+ $ export CROSS_COMPILE=<aarch64 toolchain prefix>
+ $ make qcom_defconfig
+ $ make
+
+- gzip u-boot::
+
+ gzip u-boot-nodtb.bin
+
+- Append dtb to gzipped u-boot::
+
+ cat u-boot-nodtb.bin.gz arch/arm/dts/your-board.dtb > u-boot-nodtb.bin.gz-dtb
+
+- A ``qcom.its`` file can be found in ``board/qualcomm/generic/``
+ directory. It expects a folder as ``qcom_imgs/`` in the main directory
+ containing pre-built kernel, dts and ramdisk images. See ``qcom.its``
+ for full path to images::
+
+ mkimage -f qcom.its qcom.itb
+
+- Now we've got everything to build android boot image::
+
+ mkbootimg --kernel u-boot-nodtb.bin.gz-dtb --ramdisk db845c.itb \
+ --output boot.img --pagesize 4096 --base 0x80000000
+
+- Flash boot.img using fastboot and erase dtbo to avoid conflicts with our DTB:
+
+ .. code-block:: bash
+
+ fastboot flash boot boot.img
+ fastboot erase dtbo
+
+.. _Samsung S9 page: https://en.wikipedia.org/wiki/Samsung_Galaxy_S9
+.. _DragonBoard 845c page: https://www.96boards.org/product/rb3-platform/
diff --git a/doc/board/qualcomm/debugging.rst b/doc/board/qualcomm/debugging.rst
new file mode 100644
index 0000000..1c35d19
--- /dev/null
+++ b/doc/board/qualcomm/debugging.rst
@@ -0,0 +1,61 @@
+.. 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
+
diff --git a/doc/board/qualcomm/index.rst b/doc/board/qualcomm/index.rst
index 0f9c429..4955274 100644
--- a/doc/board/qualcomm/index.rst
+++ b/doc/board/qualcomm/index.rst
@@ -7,5 +7,5 @@
:maxdepth: 2
dragonboard410c
- sdm845
- qcs404
+ board
+ debugging
diff --git a/doc/board/qualcomm/qcs404.rst b/doc/board/qualcomm/qcs404.rst
deleted file mode 100644
index 0cb71d9..0000000
--- a/doc/board/qualcomm/qcs404.rst
+++ /dev/null
@@ -1,79 +0,0 @@
-.. SPDX-License-Identifier: GPL-2.0+
-.. sectionauthor:: Sumit Garg <sumit.garg@linaro.org>
-
-QCS404 EVB
-==========
-
-About this
-----------
-This document describes the information about Qualcomm QCS404 evaluation board
-and it's usage steps.
-
-The current boot flow support loading u-boot as an Android boot image via
-Qualcomm's UEFI-based ABL (Android) Bootloader.
-
-Installation
-------------
-Build
-^^^^^
-Setup ``CROSS_COMPILE`` for aarch64 and build U-Boot for your board::
-
- $ export CROSS_COMPILE=<aarch64 toolchain prefix>
- $ make qcs404evb_defconfig
- $ make
-
-This will build ``u-boot.bin`` in the configured output directory.
-
-Generate FIT image
-^^^^^^^^^^^^^^^^^^
-A ``qcs404.its`` file can be found in ``board/qualcomm/qcs404-evb/`` directory.
-It expects a folder as ``qcs404_imgs/`` in the main directory containing
-pre-built kernel, dts and ramdisk images. See ``qcs404.its`` for full path to
-images.
-
-- Build FIT image::
-
- mkimage -f qcs404-evb.its qcs404-evb.itb
-
-Pack android boot image
-^^^^^^^^^^^^^^^^^^^^^^^
-We'll assemble android boot image with ``u-boot.bin`` instead of linux kernel,
-and FIT image instead of ``initramfs``. Android bootloader expect gzipped kernel
-with appended dtb, so let's mimic linux to satisfy stock bootloader:
-
-- create dump dtb::
-
- workdir=/tmp/prepare_payload
- mkdir -p "$workdir"
- cd "$workdir"
- mock_dtb="$workdir"/payload_mock.dtb
-
- dtc -I dts -O dtb -o "$mock_dtb" << EOF
- /dts-v1/;
- / {
- model = "Qualcomm Technologies, Inc. QCS404 EVB 4000";
- compatible = "qcom,qcs404-evb-4000", "qcom,qcs404-evb", "qcom,qcs404";
-
- #address-cells = <2>;
- #size-cells = <2>;
-
- memory@80000000 {
- device_type = "memory";
- /* We expect the bootloader to fill in the size */
- reg = <0 0x80000000 0 0>;
- };
-
- chosen { };
- };
- EOF
-
-- gzip u-boot ``gzip u-boot.bin``
-- append dtb to gzipped u-boot: ``cat u-boot.bin.gz "$mock_dtb" > u-boot.bin.gz-dtb``
-
-Now we've got everything to build android boot image:::
-
- mkbootimg --kernel u-boot.bin.gz-dtb \
- --ramdisk qcs404-evb.itb --pagesize 4096 \
- --base 0x80000000 --output boot.img
-
-Flash image on qcs404-evb using fastboot method.
diff --git a/doc/board/qualcomm/sdm845.rst b/doc/board/qualcomm/sdm845.rst
deleted file mode 100644
index d3f218e..0000000
--- a/doc/board/qualcomm/sdm845.rst
+++ /dev/null
@@ -1,162 +0,0 @@
-.. SPDX-License-Identifier: GPL-2.0+
-.. sectionauthor:: Dzmitry Sankouski <dsankouski@gmail.com>
-
-Snapdragon 845
-================
-
-About this
-----------
-This document describes the information about Qualcomm Snapdragon 845
-supported boards and it's usage steps.
-
-SDM845 - hi-end qualcomm chip, introduced in late 2017.
-Mostly used in flagship phones and tablets of 2018.
-
-The current boot flow support loading u-boot as an Android boot image via
-Qualcomm's UEFI-based ABL (Android) Bootloader.
-
-Installation
-------------
-Build
-^^^^^
-Setup ``CROSS_COMPILE`` for aarch64 and build U-Boot for your board::
-
- $ export CROSS_COMPILE=<aarch64 toolchain prefix>
- $ make <your board name here, see Boards section>_defconfig
- $ make
-
-This will build ``u-boot.bin`` in the configured output directory.
-
-Generate FIT image
-^^^^^^^^^^^^^^^^^^
-See doc/uImage.FIT for more details
-
-Pack android boot image
-^^^^^^^^^^^^^^^^^^^^^^^
-We'll assemble android boot image with ``u-boot.bin`` instead of linux kernel,
-and FIT image instead of ``initramfs``. Android bootloader expect gzipped kernel
-with appended dtb, so let's mimic linux to satisfy stock bootloader.
-
-Boards
-------
-
-starqlte
-^^^^^^^^
-
-The starqltechn is a production board for Samsung S9 (SM-G9600) phone,
-based on the Qualcomm SDM845 SoC.
-
-Steps:
-
-- Build u-boot::
-
- $ export CROSS_COMPILE=<aarch64 toolchain prefix>
- $ make starqltechn_defconfig
- $ make
-
-- Create dump dtb::
-
- workdir=/tmp/prepare_payload
- mkdir -p "$workdir"
- cd "$workdir"
- mock_dtb="$workdir"/payload_mock.dtb
-
- dtc -I dts -O dtb -o "$mock_dtb" << EOF
- /dts-v1/;
- / {
- memory {
- /* We expect the bootloader to fill in the size */
- reg = <0 0 0 0>;
- };
-
- chosen { };
- };
- EOF
-
-- gzip u-boot::
-
- gzip u-boot.bin
-
-- Append dtb to gzipped u-boot::
-
- cat u-boot.bin.gz "$mock_dtb" > u-boot.bin.gz-dtb
-
-- Now we've got everything to build android boot image::
-
- mkbootimg --base 0x0 --kernel_offset 0x00008000 \
- --ramdisk_offset 0x02000000 --tags_offset 0x01e00000 \
- --pagesize 4096 --second_offset 0x00f00000 \
- --ramdisk "$fit_image" \
- --kernel u-boot.bin.gz-dtb \
- -o boot.img
-
-- Flash image with your phone's flashing method.
-
-More information can be found on the `Samsung S9 page`_.
-
-dragonboard845c
-^^^^^^^^^^^^^^^
-
-The dragonboard845c is a Qualcomm Robotics RB3 Development Platform, based on
-the Qualcomm SDM845 SoC.
-
-Steps:
-
-- Build u-boot::
-
- $ export CROSS_COMPILE=<aarch64 toolchain prefix>
- $ make dragonboard845c_defconfig
- $ make
-
-- Create dummy dtb::
-
- workdir=/tmp/prepare_payload
- mkdir -p "$workdir"
- mock_dtb="$workdir"/payload_mock.dtb
-
- dtc -I dts -O dtb -o "$mock_dtb" << EOF
- /dts-v1/;
- / {
- #address-cells = <2>;
- #size-cells = <2>;
-
- memory@80000000 {
- device_type = "memory";
- /* We expect the bootloader to fill in the size */
- reg = <0 0x80000000 0 0>;
- };
-
- chosen { };
- };
- EOF
-
-- gzip u-boot::
-
- gzip u-boot.bin
-
-- Append dtb to gzipped u-boot::
-
- cat u-boot.bin.gz "$mock_dtb" > u-boot.bin.gz-dtb
-
-- A ``db845c.its`` file can be found in ``board/qualcomm/dragonboard845c/``
- directory. It expects a folder as ``db845c_imgs/`` in the main directory
- containing pre-built kernel, dts and ramdisk images. See ``db845c.its``
- for full path to images::
-
- mkimage -f db845c.its db845c.itb
-
-- Now we've got everything to build android boot image::
-
- mkbootimg --kernel u-boot.bin.gz-dtb --ramdisk db845c.itb \
- --output boot.img --pagesize 4096 --base 0x80000000
-
-- Flash boot.img using db845c fastboot method:
-
- .. code-block:: bash
-
- sudo fastboot flash boot boot.img
-
-More information can be found on the `DragonBoard 845c page`_.
-
-.. _Samsung S9 page: https://en.wikipedia.org/wiki/Samsung_Galaxy_S9
-.. _DragonBoard 845c page: https://www.96boards.org/product/rb3-platform/