Problems running code at 0x1C000 with S130 (nRF51822) SD

[Roger Clark]

Can someone confirm that all that needs to be changed to make code run with the SD installed is to change the linker to link to 0x1C000 instead of 0x00000 ?

To test, I have a very simple program that just flashes a LED attached to a pin.

I'm compiling using gcc and this works fine.

However if I change the linker script so that the code is linked to run at 0x1C000 and install the S130 V1.x SD , the code no longer runs.

Is there anything else that is different between running at the base of flash and running above the SD, as my understanding was that the SD just intercepts the interrupts it uses and passes all other interrupts by looking at the applications vector table addresses

Or does something else in the applications vector table need to be changed when its not located at 0x00000

[RK]

no that's about it - change the flash start, change the ram start. If you're using gcc just crib from one of the .ld scripts located in the examples directories.

1c000 is right for the v1 softdevice, v2, just incase you loaded the wrong one, is 1b000.

[Roger Clark]

Edit

Thanks

I think the issue is that the linker file is not allocating enough RAM to the SD.

The RAM start address is being set to 0x20002080 , which I think is too small

I think this is typo and the value should be 0x2002800

I'll change this and try again

Thanks for your help

[RK]

Yes that's very wrong, S130's user ram start address is 0x20002800 (you missed a zero in your latest reply).

[Roger Clark]

Thanks

Its a mistake in this repo

github.com/.../armgcc_s130_nrf51822_xxaa.ld

I've raised an issue with the author, as it looks like the RAM start address and also the RAM length are both wrong