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Original question:

TDA4VM: Booting multicore failed

TDA4VM: ATCM Or BTCM when using SCI in autosar

Menghai Zhao
Intellectual 410 points
Part Number: TDA4VM

Dear Expert,

      When I read the doc in "https://www.ti.com/lit/an/spracy6/spracy6.pdf?ts=1640876274240&ref_url=https%253A%252F%252Fwww.ti.com%252Fsitesearch%252Fdocs%252Funiversalsearch.tsp%253FlangPref%253Den-US%2526searchTerm%253Dautosar%2526nr%253D587", 

I was confused by these contens.Does it mean that I could not use ATCM? 

  • 0
    TI__Guru* 77774 points

    Hi,

    When you are booting the MCU1_0 application in SPL boot flow, then it is booted by the R5 SPL.

    R5 SPL does not enable ATCM for MCU1_0 and hence your understanding is correct, it can not be used. However, BTCM can be used as that is enabled.

    Regards

    Karan

  • 0 in reply to Karan Saxena
    Intellectual 410 points

    Dear Expert,

        I have further questions. Does the SBL and SPL mean the same thing? If I use SBL, could I use ATCM then?

  • +1 in reply to Menghai Zhao
    TI__Guru* 77774 points

    Hi,

    SBL and SPL are different bootloaders in TI SDK. SBL is the default RTOS bootloader and SPL / u-boot is the default Linux bootloader packaged in the Linux SDK.

    SBL enabled the ATCM explicitly using the _sblTcmEn function, defined at pdk/packages/ti/boot/sbl/soc/k3/sbl_misc.asm. Hence you could use ATCM when booting from SBL.

    For SPL, an option is to enable ATCM in the application code itself as the choice of runtime meddling with TCMs should remain with the firmware / application rather than it being a generic bootloader behavior.

    You can use the same code as in _sblTcmEn to do that:

        asm(" MRC p15, #0, r0, c9, c1, #1 ");

        asm(" BFC r0, #12, #20 ");

        asm(" ORR r0, r0, #0x1 ");

        asm(" MCR p15, #0, r0, c9, c1, #1 ");

    Regards

    Karan

  • 0 in reply to Karan Saxena
    Intellectual 410 points

    Dear Expert,

         I get it. Thank you,