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Arcom Embedded Linux Technical Manual Developing software for AEL

Compiling a kernel

Overview

This section explains how to build a new Linux kernel, along with the associated

modules, and install them on your target board.

To cross compile the kernel, you must have the cross compilation environment installed.

For more information, see Installing the AEL host environment

, page 34.

An archive containing the patched Linux kernel source tree used in the Development Kit

is installed by the AEL host environment as /opt/arcom/ src/linux-source-

VERSION.tar.gz. Refer to your board’s Quickstart Manual for additional board-specific

instructions.

Unpacking and configuring the kernel

The kernel must be recompiled on your host system.

To unpack and configure the kernel, follow these steps:

1 Unpack the source code:

$ tar zxf /opt/arcom/ src/linux-source-VERSION.tar.gz

The folder linux-source-VERSION is created.

$ cd linux-source-VERSION

2 Configure your kernel image. You can get a default configuration by running the

following command:

$ make ARCH=ARCH TARGET_defconfig

Where TARGET is the name of the board and ARCH is the CPU architecture of

the board. Consult your Quickstart Manual to determine the correct default

configuration for your target board.

ARCH here refers to the target CPU architecture, which is the basic CPU

architecture and does not include additional information such as

endianness (e.g. arm rather than armbe). See Specific terms

on page 8

for more information.

In general when interacting with the kernel build system directly (e.g. via

make) it is the target CPU architecture that should be used, while the AEL

tools expect the full target architecture.

3 Optional. Tweak the options to your satisfaction using the kernel configuration

tools, once you have a default configuration for your board. For example you can

use the menuconfig tool, as follows:

$ make ARCH=ARCH menuconfig

4 Save your configuration once you have made any changes required, and exit.

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Eurotech ZEUS Manual de usuario Pagina 44