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Working with customized kernels

UM0844

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Doc ID 16544 Rev 3

Working with customized kernels

When working with SPEAr evaluation boards, making modifications to supplied Linux kernel

is only needed when:

●

Changing kernel configuration, by enabling or disabling some options or features

●

Developing new drivers on top of existing ones, in order to interface peripherals that

can be added through custom add-on boards connected to SPEAr evaluation boards

(where applicable)

●

Rewriting partially or totally some existing reference device drivers (for example, for

further optimization or special needs)

●

Developing custom kernel modules

On the other hand, any other usage of kernel-level software with hardware platforms

different from SPEAr evaluation boards is not discussed in this section.

When working at kernel level, developers are concerned with the kernel source code tree

from which a single binary image file must be generated by "rebuilding" the kernel.

The main tasks to be performed are:

●

Kernel reconfiguration

●

Kernel rebuild

●

Kernel loading and execution on a target evaluation board (different possible

workflows)

For general information about Linux kernel, please refer to public Linux documentation.

For information about SPEAr-specific code integrated into Linux kernel, please refer to the

Linux Support Package (LSP) user manual (UM0851).

5.1

Reconfiguring the kernel

The kernel configuration is managed with standard Linux Kernel configuration tools, like

"make menuconfig".

Each SPEAr evaluation board has a default kernel configuration file in the kernel source tree

directory arch/arm/configs, as shown in following table:

To configure the kernel using a default configuration (for example, for SPEAr300), enter the

kernel source tree directory and run the commands:

$ make distclean

Table 3.

Kernel configuration files

Evaluation board

Kernel configuration file

EVALSPEAR300

spear300_defconfig

EVALSPEAR310

spear310_defconfig

EVALSPEAR320PLC

spear320_defconfig

EVALSPEAR600

spear600_defconfig

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