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AM4372: About Memory Mapping of AM437x's Gel file

Sh.Sasaki
Guru 13625 points
Part Number: AM4372

Hi everyone,

Does sk_am437x.gel call GEL_MapAdd()?
C:\ti\ccsv7\ccs_base\emulation\boards\sk_am437x\gel

I could not find a place calling this function.

When reading the following manuals, I think that it is necessary to use GEL_MapAdd() to access OCMCRAM(0x40300000).
www.ti.com/.../spraa74a.pdf

After the sk_am437x board is connected by CCS, OCMCRAM can be accessed from the CCS memory window.
Why is the device accessible there?

Best regards,
Sasaki

  • 0
    TI__Guru**** 170625 points
    Hi Sasaki,

    The spraa74a user guide is 14 years old and might not been up to date with all the new CCS features. Seems that for AM437x device, GEL_MapAdd() or GEL_MapAddStr() is not needed. I see we have full test including EDMA, DDR RAM and SRAM in below file:

    ti\ccsv7\ccs_base\emulation\boards\sk_am437x\gel\AM43xx_EMIFconfig_HWlvl.gel

    //#########################################################################
    //EDMA tests for DDR
    //#########################################################################


    #define INT_SRAM_BASE_ADDR 0x00300000
    #define L3_OFFSET_ADDR 0x40000000
    #define CPU_OFFSET_ADDR 0x40000000

    memWrite(0x40300000, 0x100, 0);

    edmaConfigure(DDR_BASE_ADDR, (INT_SRAM_BASE_ADDR+L3_OFFSET_ADDR), DMA_SIZE, queuqePri);
    compare((INT_SRAM_BASE_ADDR+CPU_OFFSET_ADDR), DMA_SIZE, pattern);
    memWrite(((INT_SRAM_BASE_ADDR+CPU_OFFSET_ADDR)+4*DMA_SIZE), DMA_SIZE, pattern);

    Regards,
    Pavel
  • 0 in reply to Pavel Botev
    Guru 13625 points

    Hi Pavel-san,

    Thank you for your support.

    Is it OK to think that Read / Write to memory is permitted at debugging with AM437x default setting?

    In other words, can I think that AM437x does not need to set memory mapping with gel?

    Best regards,

    Sasaki

  • 0 in reply to Sh.Sasaki
    TI__Guru**** 170625 points
    Sasaki,

    Yes, from what I was able to find, AM437x OCMC RAM does not need to be memory mapped with GEL_MapAdd() to be working fine.

    The only AM437x memory that need to be mapped with GEL_MapAdd() is inside the PRU-ICSS subsystem, check below GEL files:

    ti\ccsv7\ccs_base\emulation\gel\AM437x_PRU_ICSS0_local.gel
    ti\ccsv7\ccs_base\emulation\gel\AM437x_PRU_ICSS1_local.gel

    Regards,
    Pavel
  • 0 in reply to Pavel Botev
    Guru 13625 points
    Hi Pavel-san,

    Thank you for your support.
    I got it.

    Best regards,
    Sasaki