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AM1705: Is it possible to access EmbeddedICE-RT debug registers from ARM core?

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Replies: 2

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Part Number: AM1705

Hi. I'm running Linux 2.6.33 on an AM1705, and I'm debugging nasty memory issues in my user space application, so I'd like to have access to the hardware watchpoints for debug from gdb (or ptrace and a sigtrap handler). I found some patches that ARM added to the kernel to support them, but they're only for ARMv6 and up (and the debug interface seems to have changed a lot from ARM7/ARM9 to ARM11).

In the ARM docs for the ARM9 debug interface, I only see references to shifting in values to the debug registers over JTAG (which I don't have). So I just want to know how to set the values from within the ARM core in the Linux kernel.

Once I know that, I think I can figure it out from the ARM docs and openocd source.

Cheers, Tim

2 Replies

  • Hi Tim,

    Sorry for the delayed response. We don't provide debug register descriptions in the AM1705 TRM.. ARM docs are your best bet on finding these register addresses & see if you will be able to access them from kernel.

    Best Regards,
    Yordan

     


     Please make sure you read the forum guidelines first.

  • In reply to Yordan Kovachev:

    Thanks for your help. I see from the openocd source for Arm926EJ-S (linked below) that the debug requests over JTAG are just MRC or MCR to CP15, so I should be able to do the same instructions in the kernel in assembly.

    --

    Cheers,

    Tim

    repo.or.cz/.../arm926ejs.c

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