MQX Software SolutionsのトピックRe: Bootloader: problems with starting MQX app

Bootloader: problems with starting MQX app

dmitriym — Wed, 07 May 2014 12:38:45 GMT

Hello!

I want to update my mcu software with serial port. So i created a bootloader using processor expert for uploading S19 records to flash. For testing a bootloader i created a test program with processor expert. The bootloader with the test programm works fine, but now i have problem with starting my main MQX application. I prepared the MQX project, but my main application doesn't start:

1) set vector table of main application to be placed in RAM in user_config.h and builded BSP and PSP libraries:

#define MQX_ROM_VECTORS 0

2) created new linker file:

shifted the adresses:

bootloader	(RX): ORIGIN = 0x00000000, LENGTH = 0x00003000
boot_flags	(RW): ORIGIN = 0x00003000, LENGTH = 0x00001000

vectorrom (RX): ORIGIN = 0x00004000, LENGTH = 0x00000410

/*cfmprotrom (R): ORIGIN = 0x00004400, LENGTH = 0x00000020*/

rom (RX): ORIGIN = 0x00004420, LENGTH = 0x0004BBE0 /* Code + Const data */

my_rom (RW): ORIGIN = 0x00050000, LENGTH = 0x00030000 /* my data */

ram (RW): ORIGIN = 0x1FFF0000, LENGTH = 0x00020000 /* SRAM - RW data */

/* kernel space starts after RAM variables (Location of MQX Kernel data + MQX heap) */

end_of_kd (RW): ORIGIN = 0x2000FFF0, LENGTH = 0x00000000

/* Boot stack reused by MQX Kernel data */

bstack (RW): ORIGIN = 0x2000FA00, LENGTH = 0x00000200 /* Boot stack */

end_bstack (RW): ORIGIN = 0x2000FC00, LENGTH = 0x00000000 /* Boot stack end address requires 4B alignment */

commented:

/*.cfmprotect :

{

KEEP(*(.cfmconfig))

. = ALIGN (0x8);

} > cfmprotrom*/

So i don't understand what i missed. Can anybody help me?

Re: Bootloader: problems with starting MQX app

soledad — Thu, 08 May 2014 16:32:39 GMT

Hi,

By default, MQX allocates the vector table at the first address of the flash memory, 0x0000-0000. Because this region of flash memory is used by the your bootloader, it will be necessary to reallocate the vector table in a RAM section.

I want to believe that this appnote can be a guideline for your application: http://cache.freescale.com/files/microcontrollers/doc/app_note/AN4367.pdf

This appnote describes how to add the FNET bootloader to Kinetis projects. There is a section that includes adding it to the MQX linker which is the section that I believe you will find useful.

Have a great day,
Regards
Sol
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Re: Bootloader: problems with starting MQX app

dmitriym — Mon, 12 May 2014 06:55:29 GMT

Hello,

I understand that reallocating vector table to the RAM is nessesary for MQX app to use it with bootloader. To allocate vector table in RAM we need to set in user_config.h:

#define MQX_ROM_VECTORS 0

I've already done it and rebuild BSP and PSP libraries. And vector table is in the RAM. The MQX application starts and works normal with the vector table in RAM, when i try to debug it without bootloader (with linker file without shifting memory sections). But this MQX application is not working when I use it with bootloader (with modified linker file that i have already posted). When i try to debug it with bootloader i jump to the correct addres in memory where __boot(); of MQX app exists. Start to execute programm, but then somewhere the MQX programm stops.

I tried to jump to __boot(); while debugging only MQX app without bootloader, and it starts normaly, but in main() while starting MQX in function _mqx( (MQX_INITIALIZATION_STRUCT_PTR) &MQX_init_struct ); crashes function _mem_zero((pointer) kernel_data, (_mem_size) sizeof(KERNEL_DATA_STRUCT));. And i don't understand why

I think that with bootloader the MQX app crashes in the same place.

And as have already said the test app created with processor expert without MQX starts and runs normaly.

Re: Bootloader: problems with starting MQX app

dmitriym — Mon, 26 May 2014 15:35:04 GMT

The problem is solved.

Problem was in the stack pointer before initialization of MQX. Simmilar problem: Problem of initialization of MQX after jumping to the start of MQX application ( _boot() )