M4 hello world patches for use with remoteproc¶

• Apply patches to the imported hello_world project
  • Without the patches, the program can be loaded via JTAG but not through the remoteproc process.
  • With the patches, the program can be loaded through the remoteproc process, but not through JTAG.
  • See https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1114668/am6252-load-m4-firmware-generate-from-mcu-rtos-sdk

Add the lines shown in red

modify main.c

    #include "FreeRTOS.h" 
    #include "task.h" 

    /* add a resource table to the project so it can be loaded by Linux RemoteProc driver */
    #include "resource_table_no_ipc.h"

    #define MAIN_TASK_PRI  (configMAX_PRIORITIES-1)

modify linker.cmd

     .sysmem: {} palign(8) > M4F_IRAM     /* This is where the malloc heap goes */
     .stack:  {} palign(8) > M4F_IRAM     /* This is where the main() stack goes */

    GROUP {
        // This is the resource table used by linux to know where the IPC "VRINGs" are located
        .resource_table: {} palign(4096)
    } > DDR_0

	
/* Sections needed for C++ projects */
     .ARM.exidx:     {} palign(8) > M4F_IRAM  // Needed for C++ exception handling
     .init_array:    {} palign(8) > M4F_IRAM  // Contains function pointers called before main

     M4F_IRAM : ORIGIN = 0x00000200 , LENGTH = 0x0002FE00
     M4F_DRAM : ORIGIN = 0x00030000 , LENGTH = 0x00010000

    // when using multi-core application's i.e. more than one R5F/M4F active, make sure
    // this memory does not overlap with R5Fs

    // Resource table must be placed at the start of DDR_0 when M4 core is early booting with Linux
    DDR_0       : ORIGIN = 0x9CC00000 , LENGTH = 0x1000

new header file resource_table_no_ipc.h

• See attached: resource_table_no_ipc.h