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Register profiling

Pratik Maheshwari
Note: This was originally posted on 15th February 2011 at http://forums.arm.com

Hello,

I am currently using a ARM920T core based S3C2440 processor. I want to read the registers out of ARM9 in real-time. There is no OS running, just  a super loop. Currently, I am using an interrupt driven approach, where timer 2 overflows and goes to ISR. In the ISR I send the required register data to the Host PC through the UART. I believe this method of profiling is too intrusive(carries a lot of overhead).

I know there are tools relating to core sight technology, but I cannot update the entire development board and JTAG tools just to do that. They are very costly.

The board can also be run using linux. it runs busybox, and I tried using "devemem" applet but that is also a very intrusive method (having high overhead).

Can anyone suggest me any other method to read hardware physical registers using OS or no OS in the most efficient way and in real-time.

Thanks,
Pratik
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  • Arm Employee Badge
    Note: This was originally posted on 18th February 2011 at http://forums.arm.com

    ETM implementations typically only provide instruction trace - they do not usually provide a means to see data accesses at all, and if they do they only show external memory address accesses not the register accesses. What you are asking for is not useful for normal software development, so I'm not sure who would have a solution for it hardware (waste of gates, and very power / bandwidth hungry).

    I think you are stuck with an invasive methodology implemented in software for this ...
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  • Arm Employee Badge
    Note: This was originally posted on 18th February 2011 at http://forums.arm.com

    ETM implementations typically only provide instruction trace - they do not usually provide a means to see data accesses at all, and if they do they only show external memory address accesses not the register accesses. What you are asking for is not useful for normal software development, so I'm not sure who would have a solution for it hardware (waste of gates, and very power / bandwidth hungry).

    I think you are stuck with an invasive methodology implemented in software for this ...
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