TS-7100 kernel compile guide

Compiling the kernel requires an armhf toolchain. We recommend development under Debian Stretch which includes an armhf compiler in the repositories. See the Debian Stretch cross compilation section for instructions on installing a proper cross compiler.

git clone https://github.com/embeddedTS/linux-4.9.y
cd linux-4.9.y

# These next commands set up some necessary environment variables
export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabihf-
export LOADADDR=0x80800000

# This sets up the default configuration that we ship with
make tsimx6ul_defconfig

## Make any changes in "make menuconfig" or driver modifications, then compile
make && make zImage && make modules

The following will install the kernel and modules to a temporary directory, and then pack them up in to a single tarball:

TEMPDIR=$(mktemp -d)
mkdir "${TEMPDIR}/boot/"
cp arch/arm/boot/zImage "${TEMPDIR}"/boot/zImage
cp arch/arm/boot/dts/imx6ul*ts*.dtb  "${TEMPDIR}"/boot/
INSTALL_MOD_PATH="${TEMPDIR}" make modules_install
INSTALL_HDR_PATH="${TEMPDIR}" make headers_install 
tar czf linux-tsimx6ul-"$(cat include/config/kernel.release)"-"$(date +"%Y%m%d")".tar.gz -C "${TEMPDIR}" .
rm -rf "${TEMPDIR}"

This will output a tarball with the kernel version and short git hash, as well as the date the tarball was created. For example: linux-tsimx6ul-v4.9.171-60-g01e2117e-20190823.tar.gz

This tarball can be directly unpacked to the root folder of a bootable media for the device. It is also possible to unpack it directly on a booted system, however we do not recommend doing so on an active deployed system without extensive testing.

# Unpack it to a mounted disk, this assumes the disk is mounted to "/mnt"
zcat linux-tsimx6ul...tar.gz | tar xh -C /mnt

# Unpack it to the root directory of a booted system
zcat linux-tsimx6ul...tar.gz | tar xh -C /