Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem


vector table misplaced

Posted by Johan on March 4, 2009
I've modified the sources of FreeRTOS to create a port for the AT91SAM7A3.

The vector table is not being placed at 0x00100000, instead it ends up at 0x00101040.

In the .icf file there is a definition:
define symbol __ICFEDIT_intvec_start__ = 0x00000000;
but somehow this definition does not seem to produce any result.

In this way when the instruction SWI is executed by taskYIELD() the processor starts running the wrong code.
(Nevertheless, IAR is able to start the program properly!!!!)

How do I place the vector table at 0x00100000, please?

/Johan on behalf of eavg

RE: vector table misplaced

Posted by MEdwards on March 4, 2009
0x100000 is not the normal place for the vector table so I would guess you are trying to do the remapping so part of the RAM code is mapped to 0. Is this correct? If so then are you copying the vector table from 0x00 to 0x100000 before you do the remap? Sometimes this will be done by the debugger macro file that gets called before the debug session commences.

RE: vector table misplaced

Posted by Johan on March 5, 2009
there is no remap being made.
the program is being run from Flash so the vector table is at 0x100000 and at 0x0 since after reset Flash is at 0.

I was able to post the same question with an image at AT91 forum.
this is the link:

as you can see the PC is at the vector table but the vector table instead appears (the black shaded area at the bottom) at 0x1040.

any more ideas, please?


[ Back to the top ]    [ About FreeRTOS ]    [ Privacy ]    [ Sitemap ]    [ ]

Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News

Version 10.1.0 of the FreeRTOS kernel is available for immediate download. MIT licensed.

View a recording of the "OTA Update Security and Reliability" webinar, presented by TI and AWS.


FreeRTOS and other embedded software careers at AWS.

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Espressif ESP32

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers


STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

OpenRTOS and SafeRTOS

Xilinx Microblaze and Zynq partner