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

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Intel® Atom Processor and Intel® System Controller Hub US15W Block Diagram Intel® Atom Processor Z530 & Z510 • Low <strong>Power</strong> Microarchitecture on 45nm technology • 512 KB L2 cache • Ultra small 13x14mm package • Performance and power optimized for small form-factor, ultra-low power embedded platforms (TDP 2.2W) • Hyper-Threading Technology** Intel® System Controller Hub US15W • Integrated GMCH+ICH (single chip) • 22x22mm package • Up to 2 GB of DDR2 400/533 MHz memory down • Ultra low power integrated graphics with 2D and 3D HW accelerator • Integrated High Definition Video Decoder • Expansion capability meeting USB2.0, SDIO/MMC and PCI-Express* standards • 2.3W TDP 24bit LVDS SDVO 8 USB 2.0 Ports (1Client) 1 IDE Channel (PATA only) Intel® Atom Processor Z530/Z510 400/533 MHz FSB SDIO/ MMC Intel® SCH US15W LPC FWH Intel® High Definition Audio Highly Integrated 2-Chip Solution for Low <strong>Power</strong>, Small FF, <strong>Embedded</strong> Platforms IMVP6 DDR2 400/533 (mem down) GPIO SIO SMBus 2 PCI Express* x1 ports EC Intel <strong>Embedded</strong> and Communications Group * * On select SKUs. * * Other names and brands may be claimed as the property of others.
ACPI • ACPI is an open-industry standard primarily used for power management. • APCI defines different types of power saving states • G states (Global States) • S states (System states, which fall under G1) • P states (Performance States) • D states (Device states) • C states (Processor <strong>Power</strong> States) • Combinations of ACPI states can be used to achieve platform power reduction Intel <strong>Embedded</strong> and Communications Group
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: ACPI / cpufreq Software Architectur
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 24 and 25: Stitching it together • CPUfreq
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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