Embedded Linux Power Management on the Intel Atom ... - MontaVista

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Stitching it together • CPUfreq • Create a processor driver: √ • Define operating points: √ • Modify standard drivers to respond to CPUfreq notifications: √ • Select and configure the governor • <strong>Power</strong> management aware device drivers • Implementing power management in a device driver • Handling CPUfreq notifications in a device driver • Suspend/Resume hooks • Clock framework √ = Implemented for you by MontaVista
The processor driver Best to consult the kernel source code an Documentation/cpu-freq/cpu-drivers.txt • cpufreq_driver.name • cpufreq_driver.owner • cpufreq_driver.init • cpufreq_driver.verify • cpufreq_driver.[setpolicy|target] • cpufreq_driver.exit • cpufreq_driver.resume • cpufreq_driver.attr
Page 1 and 2: Embedded L
Page 3 and 4: Why care about Power</stron
Page 5 and 6: Power is a large f
Page 7 and 8: How we save power Two big ways: •
Page 9 and 10: ACPI / cpufreq Software Architectur
Page 11 and 12: ACPI • ACPI is an open-industry s
Page 13 and 14: What is Deep Power
Page 15 and 16: L2 Dynamic Cache Sizing OS ACPI 8-W
Page 17 and 18: Enumerate System Devices You'll nee
Page 19 and 20: Identify Constraints Are there rela
Page 22 and 23: Define Power <stro
Page 26 and 27: The Governor • Task: Decide how a
Page 28 and 29: ondemand Governor Example
Page 30 and 31: Making Drivers Power</stron
Page 32 and 33: cpufreq Notifications • Your driv
Page 34 and 35: Saving power during idle • Idle S
Page 36 and 37: Mitigate wakeups with Power
Page 38 and 39: Free for the asking... “MontaVist

Embedded Linux Power Management on the Intel Atom ... - MontaVista

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