- release matrix page:
https://developer.toradex.com/software/toradex-embedded-software/embedded-linux-release-matrix/

- resources:
https://docs.u-boot.org/en/stable/board/toradex/verdin-imx8mp.html
https://developer.toradex.com/linux-bsp/os-development/build-yocto/build-a-reference-image-with-yocto-projectopenembedded/
https://developer.toradex.com/linux-bsp/os-development/build-u-boot-and-linux-kernel-from-source-code/build-u-boot/
https://developer.toradex.com/linux-bsp/os-development/build-u-boot-and-linux-kernel-from-source-code/build-linux-kernel-from-source-code/
https://developer.toradex.com/linux-bsp/os-development/build-u-boot-and-linux-kernel-from-source-code/build-device-tree-overlays-from-source-code/

- install dependencies:
# dependencies for yocto:
apt-get install gawk wget git diffstat unzip texinfo gcc build-essential chrpath socat cpio python3 python3-pip python3-pexpect xz-utils debianutils iputils-ping python3-git python3-jinja2 python3-subunit zstd liblz4-tool file locales libacl1
apt-get install curl git 

# dependencies for u-boot:
apt-get install bc build-essential git libncurses5-dev lzop perl libssl-dev bison flex swig libyaml-dev pkg-config python3-dev
apt-get install u-boot-tools

# dependencies for kernel:
 apt-get install bc build-essential git libncurses5-dev lzop perl libssl-dev bison flex
apt-get install u-boot-tools

locale-gen en_US.UTF-8
# configure git
git config --global user.name "John Doe"
git config --global user.email johndoe@example.com

- make build directory:
mkdir /build
cd build


prepare build environment
-------------------------

mkdir /build/tools
cd /build/tools

- install repo bootstrap binary:
mkdir bin
curl https://commondatastorage.googleapis.com/git-repo-downloads/repo > bin/repo
chmod 755 bin/repo

- install the ARM GCC toolchain:
mkdir arm
cd arm
wget https://developer.arm.com/-/media/Files/downloads/gnu/14.2.rel1/binrel/arm-gnu-toolchain-14.2.rel1-x86_64-aarch64-none-linux-gnu.tar.xz
tar xvf arm-gnu-toolchain-14.2.rel1-x86_64-aarch64-none-linux-gnu.tar.xz
ln -s arm-gnu-toolchain-14.2.rel1-x86_64-aarch64-none-linux-gnu gcc-linaro-aarch64
cd ..

- install device tree compiler tool:
git clone https://git.kernel.org/pub/scm/utils/dtc/dtc.git -b v1.7.2
cd dtc
make
cp dtc ../bin/
cd ..

- export variables:
cd ..
vi start.sh
...
export ARCH=arm64
export DTC_FLAGS="-@"
export PATH=/build/tools/gcc-linaro-aarch64/bin:/build/tools/bin:$PATH
export CROSS_COMPILE=aarch64-none-linux-gnu-
...
chmod 755 start.sh
. ./start.sh


yocto image
-----------

- clone meta-information
mkdir oe-core
cd oe-core
# branch: repo init -u git://git.toradex.com/toradex-manifest.git -b scarthgap-7.x.y -m tdxref/default.xml
# specific tag:
repo init -u git://git.toradex.com/toradex-manifest.git -b refs/tags/7.1.0 -m tdxref/default.xml
repo sync
# repeat sync until successful

- setup environment:
. export

- edit config:
vi conf/local.conf
...
# set MACHINE:
MACHINE ?= "verdin-imx8mp"
# append:
ACCEPT_FSL_EULA = "1"
TOOLCHAIN_TARGET_TASK:append = " kernel-devsrc"
...

- build:
bitbake -k tdx-reference-minimal-image -c populate_sdk

- machine.conf in: layers/meta-toradex-nxp/conf/machine/verdin-imx8mp.conf
- distro.conf in: layers/meta-toradex-distro/conf/distro/*.conf
- demo images in: layers/meta-toradex-demos/recipes-images/images/*.bb

u-boot
------

cd /build
git clone https://source.denx.de/u-boot/u-boot.git
cd u-boot
# adjust tag according to version used in yocto (from release matrix page)
git checkout tags/v2024.07
git checkout -b toradex-v2024.07
mkdir patches
cd patches
cp ../../oe-core/layers/meta-toradex-bsp-common/recipes-bsp/u-boot/u-boot-toradex/* .
# adjust recipe according to version used in yocto (from release matrix page) 
PATCH_RECIPE=../../oe-core/layers/meta-toradex-bsp-common/recipes-bsp/u-boot/u-boot-toradex_2024.07.bb 
# apply patches in order
git am `grep -n TDX_PATCHES $PATCH_RECIPE | echo $((\`cut -f1 -d:\` + 1)) | xargs -I line_no tail $PATCH_RECIPE --lines=+line_no | grep -v ^\" | cut -d / -f 3 | sed -e "s/ \\\\\\\\//g"`
cd ..
# build ATF (TF-A)
git clone https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git 
cd trusted-firmware-a
make PLAT=imx8mp IMX_BOOT_UART_BASE=0x30880000 bl31
cp build/imx8mp/release/bl31.bin ..
cd ..
# get DDR firmware
wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.10.1.bin
chmod +x firmware-imx-8.10.1.bin
./firmware-imx-8.10.1.bin
cp firmware-imx-8.10.1/firmware/ddr/synopsys/lpddr4*_202006.bin .
# finally, build u-boot
make mrproper
make verdin-imx8mp_defconfig 
# dts in: dts/upstream/src/arm64/freescale/imx8mp-verdin-wifi-*.dts
#         arch/arm/dts/imx8mp-verdin-wifi-dev-u-boot.dtsi
# make menuconfig (choose dts to build)
make -j$(nproc) 2>&1 | tee build.log


kernel
------

cd /build
# adjust branch and commit according to version used in yocto:
# vi oe-core/layers/meta-toradex-nxp/recipes-kernel/linux/linux-toradex_*.bb (search for SRCBRANCH, SRCREV_machine)
git clone -b toradex_6.6-2.1.x-imx git://git.toradex.com/linux-toradex.git
cd linux-toradex
git checkout 3493ccd66900420e2462daf4db187b315b50469e
cp ../oe-core/build/deploy/images/verdin-imx8mp/kernel-config .config
# verify config
make olddefconfig
# copy yocto/kernel_lvds_freq.patch from mikroPhone repo
# apply LVDS patch
patch < ../kernel_lvds_freq.patch
# build kernel and dtb
make -j$(nproc) Image.gz 2>&1 | tee build.log
make freescale/imx8mp-verdin-wifi-dev.dtb
# ls ./arch/arm64/boot/Image.gz
# ls ./arch/arm64/boot/dts/freescale/imx8mp-verdin-wifi-dev.dtb
# build kernel modules
make -j$(nproc) modules 2>&1 | tee build.log
mkdir modules
INSTALL_MOD_PATH=`pwd`/modules make modules_install
cd modules
tar -czf ../modules.tar.gz .
cd ..


overlay
-------

# toradex overlays (match branch to kernel branch)
# git clone -b toradex_6.6-2.1.x-imx git://git.toradex.com/device-tree-overlays.git
# copy yocto/overlays from mikroPhone repo
cd overlays
STAGING_KERNEL_DIR=../linux-toradex make mikroPhone-panel_overlay.dtbo
cd ..