SW-EK-TM4C1294XL: Ethernet Bootloader Debug

Hi,

I want to debug the boot_emac_flash (ethernet bootloader) project. Inside copy_loop (copying flash to SRAM), the program gets stuck. It never exits the loop.

ProcessorInit: .asmfunc
    ;;
    ;; Copy the code image from flash to SRAM.
    ;;
    push    {lr}
    movs    r0, #0x0000
    movs    r1, #0x0000
    movt    r1, #0x2000
    ldr     r2, bss_start
copy_loop:
        ldr     r3, [r0], #4
        str     r3, [r1], #4
        cmp     r1, r2
        blt     copy_loop

    ;;
    ;; Zero fill the .bss section.
    ;;
    movs    r0, #0x0000
    ldr     r2, bss_end
zero_loop:
        str     r0, [r1], #4
        cmp     r1, r2
        blt     zero_loop

    ;;
    ;; Set the vector table pointer to the beginning of SRAM.
    ;;
    movw    r0, #(NVIC_VTABLE & 0xffff)
    movt    r0, #(NVIC_VTABLE >> 16)
    movs    r1, #0x0000
    movt    r1, #0x2000
    str     r1, [r0]

    ;;
    ;; Set the return address to the code just copied into SRAM.
    ;;
    orr     lr, lr, #0x20000000

    ;;
    ;; Return to the caller.
    ;;
    pop    {lr}
    bx      lr
    .endasmfunc

Also when I left click + CTRL on bss_start, it says Could not find symbol 'bss_start' in index.

What could be the problem?

Regards,

Ravan.