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Source: http://arago-project.org/git/projects/?p=am33x-cm3.git;a=summary This is the README for the Cortex-M3 (CM3) firmware for power management on Texas Instruments' AM33XX series of SoCs. AM33XX integrates a Cortex-M3 core to manage the entry/exit of various standy-by and deep-sleep mode. More info on this is present in the AM335X Techinal Reference Manual (TRM) available @ www.ti.com DOCUMENTATION: - The CM3 firmware design document can be found under the Documentation/ folder. SA_PM_Firmware.pdf is the best place to start. - Most of the diagrams used in the pdf were created using Dia, a GTK+ based digram creation program. The original *.dia files are also available under Documentation/ - For more technical detailis refer to the TRM on the TI website. COMPILING the firmare: - Refer to the AM335x PSP User-guide for the toolchain to be used for the Linux kernel compilation and how to get it. The same toolchain needs to be used for compiling the CM3 firmware. - With the toolchain installed and PATH setup to point to it, do a "make" to create the CM3 firmware. The binary and ELF files are by default put in the bin/ folder. - The binary file needs to be loaded to CM3 from the Cortex-A8 core before all the PM features are available. - For using the CM3 firmware with the Linux kernel refer to the the PSP User Guide PREBUILT binary: - Prebuilt binaries are available under the bin/ folder