How to test / measure embedded Linux startup code?

Question

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I've got an ARM9 Atmel SAM9G25, and it's running with an embedded Linux. Now since it's about an embedded device I want to check where i can save time and power by the startup of the device.

I know some parameters which can improve the energy savings but I only knew a few tricks to measure it. Since I not only want to test the Linux but bootstrap and u-boot in front of it too, i need a measuring method for all these 3 instances.

Can you tell which programs/algorithms can help me measure this e.g by serial port, Ethernet or by creating log files? Any links or advices?

Thanks! Greetings

Answer 1

I have successfully used bootchart in the past:

http://elinux.org/Bootchart

Here is a list of other things that may also help:

http://elinux.org/Boot_Time