Specifications

The following command selects a standard configuration for the m28 board that has been extensively tested. It

is recommended to use this as a starting point for other, customized configurations:

bash$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- m28_defconfig

[marex@pollux]$

Note: The name of this default configuration file is arch/arm/configs/XXX . By (recursively) listing

the contents of the arch/arm/configs/ directory you can easily find out which other default

configurations are available.

If you don't want to change the default configuration you can now continue to use it to build a kernel image:

bash$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- uImage

Otherwise you can modify the kernel configuration as follows:

bash$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- config

bash$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- menuconfig

Note: Because of problems (especially with some older Linux kernel versions) the use of "make xconfig"

is not recommended.

bash$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- uImage

The make target uImage uses the tool mkimage (from the U-Boot package) to create a Linux kernel image in

arch/arm/boot/uImage which is immediately usable for download and booting with U-Boot.

In case you need a DTB to boot your linux kernel, you need the following step:

bash$ make m28.dtb

In case you configured modules you will also need to compile the modules:

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- modules

add install the modules (make sure to pass the correct root path for module installation):

bash$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- INSTALL_MOD_PATH=/opt/eldk-5.2/armv5te/rootfs modules_install

6.3. Installation

For now it is sufficient to copy the Linux kernel image into the directory used by your TFTP server:

bash$ cp arch/arm/boot/uImage /tftpboot/uImage

7. Booting Embedded Linux

7.1. Introduction♦

7.2. Flattened Device Tree Blob♦

7.3. Passing Kernel Arguments♦

7.4. Boot Arguments Unleashed♦

7.5. Networked Operation with Root Filesystem over NFS♦

•

6.2. Kernel Configuration and Compilation 86