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Working with customized kernels

UM1535

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Doc ID 023036 Rev 2

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

The use of kernel-level software with hardware platforms other that 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 the path to the LSP source code, please see the release notes.

6.1

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:

Table 2.

Kernel configuration files

Evaluation board

Kernel configuration file

EVALSP1340CPU / EVALSP1310CPU

Spear13xx_defconfig

EVALSPEAR300 /EVALSPEAR310 /

EVALSP320SCPU

Spear3xx_defconfig

EVALSPEAR600

Spear6xx_defconfig

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