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Support Accessing the ARM Performance Monitoring Unit (PMU)

Discussion in 'Android Devices' started by Loufa, Mar 20, 2014.

  1. Loufa

    Loufa Lurker
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    Mar 20, 2014
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    Hello,

    I'm new to all of this so please help.
    I am attempting to gather some data on Galaxy Nexus i9250 Android v4.3 CPU ARMv7.I am trying to use ARM Streamline but it provides the following error:

    ARM Processor PMU event counters have been detected, however the event counters are reading zeroes. Event counters include those counters listed in the counter configuration options dialog under the core name but exclude the cycle counter (Clock:Cycles) as it is controlled by a dedicated counter. It is possible that the PMU configuration bit DBGEN has not been enabled, and counter values subsequently will always read as zero. To remedy, please update your firmware or Linux kernel to enable DBGEN.
    after some search i found similar problem: https://community.freescale.com/thread/302685
    which suggest some modification to the SDER Secure Debug Enable Register, Security Extensions.

    i do not know what to so i found a file perf_event in kernel source but not sure where to start.

    please help.
     

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