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This application note explains how to build a bootable Linux image (rootfs.uImage). A bootable Linux image can be booted to the target via TFTP (refer to TBD Loading Linux images via Ethernet and TFTP application note).

Linux images are built on the cross-development host. Make sure that you activate the cross development environment as described in Installing and Activating Cross Development Environment .

In the Emcraft software distribution, Linux images are built from "project" directories. A project defines a concrete Linux configuration ready for installation to the target. Each project is defined by the following files:

• <project>.kernel.${MCU}_defconfig - kernel configuration for the project;

• <project>.dts.${MCU} - kernel configuration for the project;

• <project>.busybox - busybox configuration for the project;

• <project>.initrams - spec file for the project root filesystem (initramfs).

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1. Activate the cross development environment:

   Code Block
   -bash-3.2$$ . ./ACTIVATE.sh

2. Change to the project directory, for instance:

   Code Block
   -bash-3.2$$ cd projects/rootfs

3. Run make:

   Code Block
   -bash-3.2$$ make

The make will create the project rootfs.uImage ready for load to the target.