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ac6 >> ac6-training >> Operating Systems >> Linux >> Power Management in Linux Drivers

D7 Power Management in Linux Drivers

Writing drivers with power management support

Objectives

Configure the Linux kernel for optimal power management.
Understand how Linux manages the power

To write drivers integrated in this scheme
To optimize low power modes

Install and use power-management utilities

	Labs are conducted on target boards, that can be:
	Atmel ARM9-based boards, with Lauterbach JTAG probes.
	We use the last linux kernel, as supported by the board.

Course Environment

Theoretical course

PDF course material (in English) supplemented by a printed version.
The trainer answers trainees' questions during the training and provide technical and pedagogical assistance.

Practical activities

Practical activities represent from 40% to 50% of course duration.
Code examples, exercises and solutions
One PC (Linux ou Windows) for the practical activities with, if appropriate, a target board.

One PC for two trainees when there are more than 6 trainees.

For onsite trainings:

An installation and test manual is provided to allow preinstallation of the needed software.
The trainer come with target boards if needed during the practical activities (and bring them back at the end of the course).

Downloadable preconfigured virtual machine for post-course practical activities
At the start of each session the trainer will interact with the trainees to ensure the course fits their expectations and correct if needed

Prerequisite

Good practice of C programming on Linux
Basic knowledge of Linux kernel and driver programming (see our D3 - Linux Drivers course)

Target Audience

Any embedded systems engineer or technician with the above prerequisites.

Evaluation modalities

The prerequisites indicated above are assessed before the training by the technical supervision of the traineein his company, or by the trainee himself in the exceptional case of an individual trainee.
Trainee progress is assessed in two different ways, depending on the course:

For courses lending themselves to practical exercises, the results of the exercises are checked by the trainer while, if necessary, helping trainees to carry them out by providing additional details.
Quizzes are offered at the end of sections that do not include practical exercises to verifythat the trainees have assimilated the points presented

At the end of the training, each trainee receives a certificate attesting that they have successfully completed the course.

In the event of a problem, discovered during the course, due to a lack of prerequisites by the trainee a different or additional training is offered to them, generally to reinforce their prerequisites,in agreement with their company manager if applicable.

First Day

Reminders on kernel programming

Reminders on kernel module development
Kernel objects

Exercise:

Writing a kernel module creating and using kernel objects and sets

The sysfs file system

Exercise:

Interacting with a kernel module through a kernel object and the sysfs file sytem

Power-management : APM and ACPI

The APM standard.
The ACPI standard.

Exercise:

Writing a user program to shut down the system.

Power-management, suspend and hibernate

Freezing tasks
Suspend in RAM
Suspend on Disk
Hibernate
Debugging power management

Exercise:

Writing a kernel module reacting to suspend in RAM and system wakeup

Second Day

Power management in drivers

Device states vs System state
Putting devices in low-power modes
Power-management operations in drivers
Controling system state changes from drivers

Exercise:

Adapting a device driver to put the device in suspended state when unused

Cpu frequency governors

The cpufreq user interface.
The various governors available.

Idle Cpu governors

The Idle task.
The Idle device concept.
CpuIdle governors.

This course, designed for face-to-face delivery, can be provided either in our Paris training center or, worldwide, on your premises.

Scheduled classes are confirmed as soon as there is two confirmed bookings. Bookings are accepted until 1 week before the course start.

To book a training session or for more information, please contact us on info@ac6-training.com.

Registrations are accepted till one week before the start date for scheduled classes. For late registrations, please consult us.

You can also fill and send us the registration form

Last update of course schedule: 20 July 2022

Booking one of our trainings is subject to our General Terms of Sales

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