[ANSWERED/SOLVED] J-Flash ARM - setting GPNVM bit 2 on AT91SAM7X256

jobi · Nov 24th 2009, 9:12am

Hello.

I am trying to figure out how to set the GPNVM bit (2) after programming the device.
Until now, I programm the device using J-Flash, and then use a Script for SAM-BA to
set the GPNVM bit. Without that, the controller will not boot from Flash.
But this method is very circuitous.

Is there a way to set the bit in J-Flash?

SEGGER - Alex · Nov 26th 2009, 8:57am

Hi jobi,

as far as I can see GPNVM bit 2 is automatically set by the RAMCode, if not already set.
It is possible that in old versions of J-Flash this was not performed automatically. Which version do you use?

However, to set any GPNVM bit on the AT91SAM7X128/256/512, simply add the following lines to your init sequence in J-Flash:

Source Code

0xFFFFFF64 Write 32bit 0x5A00020B // Set General purpose bit 2, to set another GPNVM bit, change "2" to the number of the GPNVM bit
Read 32bit 0xFFFFFF68 // Wait for operation to complete
Var AND 0x00000001
Var BEQ #x // x = Index of Init command: Read 32bit 0xFFFFFF68

Best regards
Alex

jobi · Dec 2nd 2009, 10:01am

Hello Alex.

Thank you.
This Code works fine, and yes the new Software version does this automatically.

Consider this solved.

Best regards
JoBi

Source Code

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