Question

I m using an Olimex ARM-USB-OCD dongle with openOCD and GDB to program and debug an stm32f103 micro. The IDE I m using came from the Olimex dev-kit CD and makes use of eclipse ganymede.

I can load a small program into the RAM and step through the code without any problems.

I now have a much larger program which doesn t fit into RAM (which is only 20K) and so I d like to run it from flash (which is 128K).

I ve modified the linker script indicating the program code should go in the flash section (address 0x8000000), but gdb fails to load the program.

(gdb) 
20 load main.out
&"load main.out
"
load main.out
~"Loading section .text, size 0xb0e6 lma 0x8000000
"
Loading section .text, size 0xb0e6 lma 0x8000000
&"Load failed
"
Load failed

What should I do to get gdb to load the program into flash?

Answer 1

Have you considered flashing directly with openocd? I am doing this in a similar setup, but with an ARM7 microcontroller.

 openocd -f flash.cfg

Here is my flash.cfg

set CHIPNAME at91sam7x512

source [find interface/olimex-arm-usb-ocd.cfg]
source [find target/at91sam7sx.cfg]

init    
halt

flash probe 0
flash probe 1

flash erase_sector 0 0 15
flash erase_sector 1 0 15

flash write_image my-image.elf

at91sam7 gpnvm 0 set
at91sam7 gpnvm 1 set
at91sam7 gpnvm 2 set
shutdown

The GPNVM stuff is Atmel SAM7 specific, but I think this script should give you a good starting point for making a STM32 version. Openocd can be a bit confusing in the beginning, but the documentation is good and worth reading (http://openocd.berlios.de/). The current stable version (0.4.0) is quite old, so if you have problems, download the latest source code and compile your own.

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