AM6442: TCM usage for program code

Hello Chris,

All you need to do is set up the linker command file properly to make sure that data is stored in the local TCM instead of a memory address outside of the R5F subsystem.

The other thing to keep in mind is that in order for the R5F binary to be loaded by Linux, there must be a resource table in the R5F project that is placed in DDR. For more information, reference this FAQ (currently still a work in progress, so if there are any questions please let me know): https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1193620/faq-am62x-am64x-how-to-allow-linux-to-load-m4f-r5f-firmware-by-adding-a-resource-table

The easiest MCU+ example to reference is probably examples/drivers/ipc/ipc_rpmsg_echo_linux/am64x-evm/r5fss1-0_freertos/ti-arm-clang/linker.cmd

Every section that is placed in DDR (other than the resource table) could be moved to TCM memory with changes like this:

    /* This is rest of code. This can be placed in DDR if DDR is available and needed */
    GROUP {
        .text:   {} palign(8)   /* This is where code resides */
        .rodata: {} palign(8)   /* This is where const's go */
/*    } > DDR_1 */
    } > R5F_TCMB0

Just make sure that the code you are placing in TCM memory actually fits!

Regards,

Nick