1.1.4. SDK Build using Makefile

Overview

Inside of the Processor SDK Linux AM62x package, there is a top-level Makefile that can be used to build some of the sub-components found within the SDK. This Makefile uses the Rules.make file and gives an example of how the various components can be built and the parameters to use.

The source code is available at TexasInstruments/ti-tisdk-makefile

Caution

You should not call this makefile with the “environment-setup” script sourced. The sub-component Makefiles will handle sourcing this script where appropriate, but some make targets such as the Linux kernel make target do not work properly when this script is already sourced.

Rules.make

The following sections cover the Rules.make file found in the top-level of the Processor SDK Linux AM62x package.

Purpose

The Rules.make file in the top-level of the Processor SDK Linux AM62x package is used not only by the top-level Makefile, but also by many of the sub-component Makefiles to gain access to common shared variables and settings. The next section covers the main variables defined in the Rules.make file.

Variables Defined

PLATFORM - This represents the machine name of the device supported by the SDK. This machine name has a direct correlation to the machine definition in the Arago project build system. The PLATFORM variable can be used by component Makefiles to make decisions on a per-machine basis.
ARCH - This represents the architecture family of the machine. This can be used by component Makefiles to change settings such as mtune values in CFLAGS based on the architecture of the PLATFORM.
UBOOT_MACHINE - This us used when building u-boot to configure the u-boot sources for the correct device.
TI_SDK_PATH - This points to the top-level of the SDK. This is the same directory where the Rules.make file itself is located.
DESTDIR - This points to the base installation directory that applications/drivers should be installed to. This is usually the root of a target file system but can be changed to point anywhere.
LINUX_DEVKIT_PATH - This points to the linux-devkit directory. This directory is the base directory containing the cross-compiler and cross-libraries as well as the environment-setup script used by many component Makefiles to source additional variable settings.
CROSS_COMPILE - This setting represents the CROSS_COMPILE prefix to be used when invoking the cross-compiler. Many components such as the Linux kernel use the variable CROSS_COMPILE to prepend the proper prefix to commands such as gcc to invoke the ARM cross-compiler.
ENV_SETUP - This points to the environment-setup script in the linux-devkit directory used by many components to configure for a cross-compilation build.
LINUXKERNEL_INSTALL_DIR - This points to the location of the Linux kernel sources, which is used by components such as out-of-tree kernel drivers to find the Linux kernel Makefiles and headers.

Makefile

The following sections cover the Makefile found in the top-level of the Processor SDK Linux AM62x package. The Processor SDK Linux AM62x can be installed either on a Linux host or inside a docker container that is hosted on ghcr.io/texasinstruments.

1.1.4.1. Steps to follow inside a Docker Container

The SD card you wish to create is inserted into the host system and has a size sufficiently large (16GB or larger) to hold at least the bootloaders, kernel and root file system.
Refer Steps to Run SDK Installer inside a Container.
Follow this to understand the Makefile usage.

1.1.4.2. Steps to follow on Linux Host

Required Host Packages

Please run the following command to install all packages required to by the makefile targets.

Important

AM62x installer supports am62xx-evm and am62xx-lp-evm platforms. am62xx-evm is the default platform for the Toplevel Makefile. To build for am62xx-lp-evm, pass PLATFORM=am62xx-lp-evm as argument to make.
No special arguments are needed to build for am62xxsip-evm in AM62xSIP Installer.

host# sudo apt-get install build-essential autoconf automake bison flex libssl-dev bc u-boot-tools swig python3 python3-pip

Following pip packages are also needed for jailhouse & binman in u-boot targets

host# pip3 install jsonschema pyelftools PyYAML Mako yamllint

Target Types

For each of the targets discussed below the following target type are defined

<target> - This is the build target which will compile the release version of the component.

<target>_stage - This target will copy the component to <TISDK_path>/board-support/built-images folder.

<target>_install - This target will install the component to the location pointed to by DESTDIR.
<target>_clean - This target will clean the component.

Top-Level Targets

The Processor SDK Linux AM62x package provides the following targets by default, which will invoke the corresponding component targets:

all - This will call the build target for each component defined in the Makefile.
install - This will call the install target for each component defined in the Makefile.
clean - This will call the clean target for each component defined in the Makefile.

Common Targets

The following targets are common to all platforms in Processor SDK Linux AM62x package:

linux - Compiles the Linux kernel using the default tisdk_<PLATFORM>_defconfig configuration.
linux-dtbs - Compiles and creates the device tree blobs.
u-boot - This target will build both u-boot and the u-boot SPL (MLO) binaries used in newer versions of u-boot. This actually provides a u-boot and u-boot-spl target in the Makefile.

Additional Targets

Depending on the capabilities and software available for a given device additional targets may also be defined. You can find the list of all the targets by looking at the all target as described in the **Top-Level Targets** section above. Some devices will have following additional targets:

arm-benchmarks - Build the ARM Benchmarks
cryptodev - Build module for cryptographic hardware accelerators.

ti-img-rogue-driver - Build GPU Kernel module.
jailhouse - Builds the required kernel module, hypervisor firmware, jailhouse tools and cell configs. Applicable for only platforms with Hypervisor support enabled.

Along with these targets, there might be additional targets for different external kernel modules. This list is different for each platform.

Usage Examples

The following examples demonstrate how to use the top-level Makefile for some common tasks. All of the examples below assume that you are calling the Makefile from the top-level of the SDK.

Build Everything
```
host# make all
```
Clean Everything
```
host# make clean
```
Install Everything
```
host# make install
```

Build Linux kernel and Fitimage
```
host# make linux
```

Copy FitImage, Linux Kernel Image and boot-binaries to built-images folder
```
host# make linux_stage
```

Install Linux kernel modules and Fitimage to SD card rootfs

host# make linux_install

To install in SD card directly:
host# sudo DESTDIR=/media/$USER/rootfs make linux_install

Clean Linux
```
host# make linux_clean
```

To build Linux kernel and FitImage for am62xx-lp-evm, pass PLATFORM=am62xx-lp-evm argument to make.
```
host# PLATFORM=am62xx-lp-evm make linux
```

make linux_install for am62xx-lp-evm

host# sudo DESTDIR=/media/$USER/rootfs PLATFORM=am62xx-lp-evm make linux_install

To Build GPU kernel module

host# make ti-img-rogue-driver

Install GPU Kernel Modules
host# make ti-img-rogue-driver_install

To install in SD card directly:
host# sudo DESTDIR=/media/$USER/rootfs make ti-img-rogue-driver_install

Build the ARM Benchmarks
```
host# make arm-benchmarks
```
Clean the ARM Benchmarks
```
host# make arm-benchmarks_clean
```
Install the ARM Benchmarks
```
host# sudo make arm-benchmarks_install
```

Build u-boot
```
host# make u-boot
```
Build A53
```
host# make u-boot-a53
```
Build R5
```
host# make u-boot-r5
```
Copy boot-binaries to built-images folder
```
host# make u-boot_stage
```

Install boot-binaries to SD card boot partition

host# sudo DESTDIR=/media/$USER/boot make u-boot_install

Clean u-boot
```
host# make u-boot_clean
```

To build u-boot binaries for am62xx-lp-evm, pass PLATFORM=am62xx-lp-evm argument to make.

Build u-boot for am62xx-lp-evm

host# make u-boot PLATFORM=am62xx-lp-evm

Install boot-binaries to SD card boot partition for am62xx-lp-evm

host# sudo DESTDIR=/media/$USER/boot PLATFORM=am62xx-lp-evm make u-boot_install

Similar argument can be added to all u-boot targets discussed above.

Installing boot binaries

All the install targets copy the files in the rootfs pointed by the DESTDIR variable. Run following commands to copy boot binaries in SD card boot partition.

For GP

host# sudo cp board-support/built-images/tiboot3-am62*-gp-evm.bin /media/$USER/boot/tiboot3.bin
host# sudo cp board-support/built-images/u-boot.img board-support/built-images/tispl.bin /media/$USER/boot

For HS-FS

host# sudo cp board-support/built-images/tiboot3-am62*-hs-fs-evm.bin /media/$USER/boot/tiboot3.bin
host# sudo cp board-support/built-images/u-boot.img board-support/built-images/tispl.bin /media/$USER/boot

For HS-SE

host# sudo cp board-support/built-images/tiboot3-am62*-hs-evm.bin /media/$USER/boot/tiboot3.bin
host# sudo cp board-support/built-images/tispl.bin board-support/built-images/u-boot.img /media/$USER/boot

A Note about Out-of-tree Kernel Modules

Some drivers like the GPU drivers are delivered as modules outside of the kernel tree. If you rebuild the kernel and install it using the “make linux_install” target you will also need to rebuild the out of tree modules and install them as well. The modules_install command used by the linux_install target will remove any existing drivers before installing the new ones. This means those drivers are no longer available until they have been rebuilt against the kernel and re-installed.

A Note about the Linux Kernel Version

To simplify and accelerate rebuilding and installing the linux kernel, the file .scmversion is included in the kernel source tree to pin down the version of the kernel provided in the SDK. If upgrading the kernel sources or adding new commits, this file should be removed so that the appropriate version is built into the kernel image.