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RTSC Package Clock speed

Abhishek Singh Sisodia
Intellectual 535 points

Hi

I am using EVM8148. For the same i am trying to use RTSC platform. When i select the package name as ti.platforms.evmDM8148 with the CPU core as GEM I am surprized to see the clock speed mentioned in the default package for evm 8148 of my XDC tools v3.22. Its 500 Mhz.

My question this EVM board the clock should be 750MHZ as specified in datasheet but why TI has set default as 500 MHZ. And if i choose  ti.platforms.evmDM814x then clock is 800 MHZ.

Do i need to create my custom RTSC package (memory map is fine) for the clock? And how does these settings affect the hardware clock? I doubt if they really do.

Please clarify..

Thanks

Abhishek

  • 0
    TI__Mastermind 20480 points

    Hi Abhishek,

    I agree, the default frequencies seems to be odd. Let me check, but I think there is probably a reason for it.

    For the evmDM8148, you are correct, neither BIOS or XDCtools will configure the hardware clock for you.

    But in any case, the frequency that you are using within the ti.platforms.evmDM8148 is just used to let BIOS scale the timing services (clock and time stamps) with the actual frequency. You don't need to create a custom RTSC package as it can overridden with your .cfg file:

    BIOS.cpuFreq = 750000000;  //750MHz