Need help on APM for gumstix


I am trying to get APM to work on the gumstix. I was able to put it to sleep, validated by measuring the current (normal ~200mA, sleep ~10mA) by using command "apm -s". Where the code is downloaded from

formatting link
and modified slightly to run on the gumstix.

I have a switch that sends the wake up signal to the PXA255 and it seems to be valid since the current jumps back to about 130mA from

10mA. However, there is nothing showing at the serial console. My guess is that the APM driver was not initialized properly. Just a note, the current is about 300mA when the unit is booting up from reset.

My questions:

  1. Can anyone point me to the source code or the directory where thing are set up during boot time? I am new to the Linux kernel and not familiar with the directory structure.

1.1 Would the code be in u-boot or kernel?

  1. BTW, is there documentation on how the kernel source files are organized? I have the book title "Understanding the Linux Kernel" but it does not have enough details on page 539.

Any help will be much appreciated.

Regards, Podi

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