Eclipse error "No source available for "0xfffffffe""

[RPDben]

Hi,

I am creating a custom project using Eclipse Managed Make having followed the instructions from here.

I am continually getting the above error when I try to Debug. The Disassembly window shows "Unable to retrieve disassembly data from backend" next to the addresses from 0xfffffffe and upwards. The addresses below this show actual assembly.

I am using SDK 10.0.0 with S110. I have checked that SD 8.0.0 is on the device and it is.

Any help would be greatly appreciated.

Thanks,

[Dave_couling]

Unfortunately this particular error can have many causes. Some things to look into:

1. Verify in the makefile that you have optimization turned off
2. You have the correct RAM settings in the Linker File - These can often be set wrong by fault. Make sure they are set to your particular device

[RPDben]

I have set optimization level 0 (-O0). I am using the nRF51822 QFAC and my linker file has the following RAM settings:

MEMORY
{
  FLASH (rx) : ORIGIN = 0x18000, LENGTH = 0x28000
  RAM (rwx) :  ORIGIN = 0x20002000, LENGTH = 0x6000
}

[Vidar Berg]

I suspect hardfault, or one of the other exceptions that are only declared in the startup file. Could you post a dump of the core registers when program is in this state? E.g., call

>nrfjprog --readregs

[RPDben]

I have managed to figure out the solution. The problem was two-fold

1. The file "gcc_startup_nrf51.S" needed to be moved into the base folder
2. My "Debug Format" was set to toolchain default and needed to be changed to explicitly define gdb.

I hope this helps anyone else with the same problem!