AT91SAM7X256 doesn't start after repowering

Development Boards MicroMod
1

Hi,

I work with an AT91SAM7X256 ARM on my own circuit board. At the moment I use eclispe with OpenOCD for programming and flashing the chip and GNU-ELF for debugging it. In order to have a realtime operating system I chose freeRTOS. All the stuff described before is running quite well, but only when I start the programm out of my debugger (run program) inside eclipse. When I unpower and repower the device without any JTAG or something attached it doesn’t start. What could be the reason for that? Do I have to set any configuration-bits?

2

Hello,

I’ve had this problem myself.

There is probably something wrong PLL or reset-settings. The debugger sets the registers to some working value but your application does not.

Check the debugger flash-run script and see what registers it alters and find if it differs from what your start-up code does.

Good luck!

3

I still have the problem I described before. Can you please post your working settings so that I can compare yours and mine?

The situation now is like the following: After flashing the AT91SAM7X256 the program doesn’t start automatically after finishing the flash-process. I have to start the OOCD Server AND the GDB Debugger which displays the state: symbol not available. My program starts after pressing the play-button. At the moment it’s not possible to start the program without the Debugger as a stand-alone circuit like it should be! Could you please give me a hint how I can solve this problem? Thanks.

4

I edited my last posting because the solution I had turned out not to work! Does anybody have an idea (look at my posting above)?

5

hello,

did you set GPNVM Bit 2?

if not the at91sam7x boots from internal rom.

regards

gerhard

6

Hi gerhardf1,

my OOCD-flashscript contains the following lines (snippet):

flash write_bank 0 $flashname 0x0
at91sam7 gpnvm 0 2 set
init_reset run
soft_reset_halt

So I really have to set the GPNVM-bit each time I flash the chip?

7

Bennm:
Hi gerhardf1,

my OOCD-flashscript contains the following lines (snippet):

flash write_bank 0 $flashname 0x0

at91sam7 gpnvm 0 2 set
init_reset run
soft_reset_halt




So I really have to set the GPNVM-bit each time I flash the chip?
you only have to set the GPNVM-bit if you activate the erase pin.

regards

gerhard