Problem debugging bootloader using Ozone

Question

Hi, 
 I'm trying to debug my bootloader (I2C specifically) using Ozone. However the CPU only seems to halt when trying to debug the bootloader. 
 Also setting breakpoints only results in the error code: 
 
 SetBreakpoint: JLINK API call failed

Settings breakpoints in the application however works fine and when running the application through Ozone does not result in the CPU halting. And I can trigger the breakpoints on the I2C event handler by sending something over I2C.

Based on this link i have modified the AfterTargetDownload and AfterTargetReset accordingly:

void AfterTargetReset (void) {
 unsigned int SP; 
 unsigned int PC; 
 unsigned int VectorTableAddr; 
 
 VectorTableAddr = Elf.GetBaseAddr(); 
 
 if (VectorTableAddr == 0xFFFFFFFF) { 
 Util.Log("Project file error: failed to get program base"); 
 } else { 
 SP = Target.ReadU32(0x0); 
 Target.SetReg("SP", SP); 
 
 PC = Target.ReadU32(0x0 + 0x4); 
 Target.SetReg("PC", PC); 
 }
} 
 
 I'm not really sure where to go from here... 
 
 SDK: v15.0 
 Softdevice: v6.0.0 
 
 Br, 
 Anton

Vidar Berg · Accepted Answer

Thanks. So I got the same hardfault with GDB and turns out it's erasing the MBR section when setting the BL start and MBR param page address. Try to use the UICR registers instead: 
 
 When you have updated the registers in UICR, program the bootloader image first, and the Softdevice after. 
 
 Edit: you can 'nrfjprog memrd 0' after programming the bootloader in Ozone and see if it reads 0xFF..FF to determine if the MBR got erased.

Problem debugging bootloader using Ozone

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