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[FAQ] J784S4XEVM: How to load TIFS using JTAG on HS-FS device?

Diwakar Dhyani
Guru 56465 points
Part Number: J784S4XEVM

Tool/software:

How to load TIFS using JTAG on HS-FS device?

  • +1
    TI__Guru 56465 points

    On HS-FS device , JTAG for M4 core will locked by default so there is no way to load the TIFS binary to M4_0 using JTAG in No-Boot mode.But if you still want to load the TIFS using JTAG there is another way for it, using Dev-Boot mode

    During the Development boot (BOOTMODE[4] = 0), the SMS ROM code will act as the boot of the primary image completion, and the SMS ROM will then be waiting for firmware load message from MCU R5. Thus as user you can load a standard u-boot/SPL image to the R5 RAM. U-boot/SPL will then load the SMS firmware and complete the full boot.

    We will add the TIFS binary along with the SBL image and then using JTAG we will load the SBL image on the R5 core. As SBL already have TIFS embedded in it, no need to read it from the external boot media,  we will just pass the pointer of the TIFS binary to the secure ROM, so that it can authenticate and load it.

    Steps to build the SBL embedded with TIFS

    • In the PDK we do have TIFS binary in the .h format along with .bin

      • for example in J784S4 RTOS SDK you can find the HS-FS TIFS header file at:

        • <RTOS_SDK>/<pdk>/packages/ti/drv/sciclient/soc/V6/sciclient_firmware_V6_hs_fs_enc.h

    • This .h file can be included in the SBL image.

    • Please have a look at the patch for the implementation on J784S4 9.2 RTOS SDK.
      /cfs-file/__key/communityserver-discussions-components-files/791/0001_2D00_Embedded_2D00_TIFS_2D00_into_2D00_SBL_2D00_binary.patch

    • Run below command after applying the changes as mentioned in the patch to build SBL.
      • make sbl_mmcsd_img_clean BOARD=j784s4_evm 
      • make sbl_lib_mmcsd_clean BOARD=j784s4_evm
      • make sbl_lib_mmcsd BOARD=j784s4_evm
      • make sbl_mmcsd_img  BOARD=j784s4_evm 

        Note:In this demo we are using mmcsd sbl image but this can be done with any other sbl image.

    • Keep the Device in Dev Boot mode and power on .

      • For EVM DIP switch configuration as follow’s

        • SW8[1:8] 1000_0000

        • SW9[1:8] 0111_0000

    • Open debugger connect to R5 core , load SBL image and run.

    • UART console print:

    With this approach we are not actually connecting to the M4_0 for loading TIFS but SBL is doing the task for us.You can also do the power on of the other core's inside the SBL using TISCI api, so that you can load the firmware on those core using JTAG at later stage.