IWR1443: How execute the downloaded secondary bootloader?

Hi JohnH:

Thanks for your reply.

Is the interrupt vector table has to be started at address 0x0? I am wondering if I can have different vector tables for the PBL and the SBL. 

I put the Linker file of my SBL below, please take a look:

/* Linker Settings                                                            */
--retain="*(.intvecs)"
--entry_point="_c_int00"
/*----------------------------------------------------------------------------*/
/* Memory Map                                                                 */
MEMORY{
    /* Flash */
    m_dst1         (RX)  : origin=0x00009000 length=0x00001000

    VECTORS        (X) :  origin=0x0000A000 length=0x00000100
    PROG_RAM       (RX) : origin=0x0000A100 length=0x00007B00

    DATA_RAM       (RW)  : origin=0x08007C00 length=0x000083FC
    m_resetreason  (RW)  : origin=0x0800FFFC length=0x00000004
}

/*----------------------------------------------------------------------------*/
/* Section Configuration                                                      */
SECTIONS{
    .intvecs : {} > VECTORS

    .text    : palign(2) {} > PROG_RAM /*7.5.4.2.5 CCS Helper*/
    .const   : palign(2) {} > PROG_RAM
    .cinit   : {} > PROG_RAM ALIGN(16)

    .bss     : {} > DATA_RAM
    .data    : {} > DATA_RAM
    .stack   : {} > DATA_RAM

    .dst1 :
    {
      . = ALIGN(4);
    } > m_dst1

    .mcu.resetreason (NOLOAD) :
    {
      . = ALIGN(4);
    } > m_resetreason
}
/*----------------------------------------------------------------------------*/

The m_dst1 is the section for some info about the part no, shared with the PBL. 

The VECTORS and the PROG_RAM are the places for the SBL. 

If I understand correctly, the VECTORS should be from 0x0, however, the VECTORS of the PBL is also started from 0x0. 

Can I copy the VECTORS of the SBL from 0x0, should I worry about the data from PBL been covered?

Thanks for your support. 

Hi JohnH:
I have an additional question.
How the CCS load and execute the program in RAM?

In the CCS, I can see all the SBL program data has been successfully downloaded into the RAM and the new interrupt vector table copied to the address 0x0. But after the soft reset, the new application(SBL) locates in the new address is not loaded.

Hi:

I think I need to explain a little bit more about what I plan to do.

1. There will be a primary bootloader runs as an application. This primary bootloader will be located in the Flash and executed after the power turns to on.

2. This primary bootloader(PBL) tries to execute the Radar Application. If it cannot it will stay in the primary bootloader mode and wait for the Secondary bootloader(SBL) to be downloaded through CAN. The SBL is programmed into the SREC file by the armhex tool.

3. The SBL will be located in the TCMA. The PBL will execute the SBL after it has been successfully downloaded. 

4. The SBL includes the function to reflash the QSPI. The data of the Radar Application will be downloaded into the QSPI. 

5. Reset the MCU and back to 1. 

Here is the flow chart:

The problem I am currently experiencing is, the SBL is completely downloaded, and it locates at the address that I wanted. However, the PBL cannot execute the SBL by the entry point of the SBL. For example, the entry point is in the address 0x0001bb1c, if the PBL call the address, it will crash. The Hex data in the address is the same in the SREC file. 

So I think it is not just called the entry point, there must something else has to be done before it. 

But I have no clue how to find the solution. 

I hope you understand what I just said. 

Thanks for your support.

Hi:
Sorry about my unclear description.
I mean the pointer address in the disassembly of the _c_int00. I only load the PBL program in the CCS, and the SBL is the one that downloaded by the PBL program into the RAM.

The system initialization has been done in the PBL, such as ESM, SOC and PINMUX. Since the SBL is not executed appropriately, the main function is not running. 

I am wondering, is it possible to run the application by another running application while they have the different entry points?

Regards
Jianyuan