AM62A7: How does firmware builder utilized in SBL boot mode?

Hi Jason,

As mentioned in my previous response SBL is built using MCU+SDK, you can find it in your firmware builder directory. We have a guide on how to build binaries using MCU+SDK: https://software-dl.ti.com/mcu-plus-sdk/esd/AM62AX/10_00_00_14/exports/docs/api_guide_am62ax/MAKEFILE_BUILD_PAGE.html#MAKEFILE_EXAMPLE_BUILD

You can also use the following command once in the MCU+SDK folder to build all the SBL examples:

> cd mcu_plus_sdk_am62ax_10_01_00_15
> make sbl -sj

Best Regards,

Meet.

Hi Jason,

There is a difference between SPL and SBL bootflow, please refer to this: https://dev.ti.com/tirex/explore/node?node=A__AZdBTlT8UK2hNwHKXaPieQ__AM62-ACADEMY__uiYMDcq__LATEST

When using SPL you combine R5 FW with A53 SPL, OPTEE and ATF to create tispl.bin, when using SBL bootflow you don't need to do this, as SBL loads R5 firmware independently from a specified offset, please refer to the following document to understand the SBL bootflow: https://software-dl.ti.com/mcu-plus-sdk/esd/AM62AX/11_01_00_16/exports/docs/api_guide_am62ax/BOOTFLOW_GUIDE.html

You can also refer to these links to understand SBL OSPI booting linux: 

https://software-dl.ti.com/mcu-plus-sdk/esd/AM62AX/11_01_00_16/exports/docs/api_guide_am62ax/SBL_BOOTING_LINUX_OSPI.html

https://software-dl.ti.com/mcu-plus-sdk/esd/AM62AX/11_01_00_16/exports/docs/api_guide_am62ax/EXAMPLES_DRIVERS_SBL_OSPI_LINUX_MULTISTAGE.html

So, when using SBL, you can flash your updated DM FW at the offset specified/configured in the SBL and from that offset SBL would be able to load it. 

Best Regards,

Meet.