Putting vector table in RAM

[vrg6]

Hello all,

I am currently working on a project that uses a mcuboot and application on the same flash memory. So far everything is working fine, but I have ran into a problem. The application uses MQX and has a special start of file signature that it needs for mcuboot configuration parameters. This is the same spot as the vector table. 

I was pointed to this guide that said to set MQX_ROM_VECTORS to 0 and compile. It appears that the vector reset table is no longer at 0 and is getting put in the RAM area, but when I try to program my board I get the following error .

When I don't have MQX_ROM_VECTORS set to 0 and have a base version of the project, everything programs and builds just fine.

Attached is the linker file I am using. 

How do I get the vector table into RAM?

[soledad]

Hi, 

Typically you don't put vector table directly to RAM for internal flash targets. The vector table is located physically in internal flash in non-volatile memory and the startup code makes a copy from flash to RAM. 

In general with the supported toolchain, all need is to build BSP and PSP with #define MQX_ROM_VECTORS 0.

In user configuration of your board user_config.h:

#define MQX_ROM_VECTORS 0 

#define BSPCFG_ENABLE_ITTYF 1   

#define BSP_DEFAULT_IO_CHANNEL "ittyf:"  

Build MQX libraries. Then build /mqx/examples/hello2 application for internal flash Debug target. Load hello2 executable to MCU and run.

I break in idle task, in debugger I can see Cortex-M4 VTOR = 0x1FFF0000. At address 0x1FFF0000 I can see vector table, most of vectors point to _int_kernel_isr().

Please let me know if this helps,

have a nice day!

Soledad