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Detecting JTAG connection from CPU

yuri poliak
Note: This was originally posted on 11th June 2013 at http://forums.arm.com

Hi all.

I am interested to know if during the initialization process while connecting Jtag debugger to ARM device such as cortex a9, there any way to indicate from the Kernel that this interface is in use?
i would like to know if the initialization process before halting the system is using any CPU register?

thank you
Parents
  • Note: This was originally posted on 13th June 2013 at http://forums.arm.com

    [size=2]I know that when i connect JTAG debugger, there are several initialization process between the debugger and the mobile phone. One of the things that happen during this initialization is  halting the CPU. [/size]
    [size=2]I want to build kernel module that will indicate that a JTAG debugger is now trying to communicate with the CPU, before that the system has been halted. In other words does the kernel can read the registers that are used during the initialization process or during the halting process? does the halting instruction is atomic(happens immediately ? does the Kernel can indicate that halting is going to happen?[/size]
    [size=2]
    [/size]
    [size=2]
    [/size]
    [size=2]Thank you! [/size]
Reply
  • Note: This was originally posted on 13th June 2013 at http://forums.arm.com

    [size=2]I know that when i connect JTAG debugger, there are several initialization process between the debugger and the mobile phone. One of the things that happen during this initialization is  halting the CPU. [/size]
    [size=2]I want to build kernel module that will indicate that a JTAG debugger is now trying to communicate with the CPU, before that the system has been halted. In other words does the kernel can read the registers that are used during the initialization process or during the halting process? does the halting instruction is atomic(happens immediately ? does the Kernel can indicate that halting is going to happen?[/size]
    [size=2]
    [/size]
    [size=2]
    [/size]
    [size=2]Thank you! [/size]
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