I am using an Renesas RZ/A1H (ARM Cortex A9) running XIP Linux, so I have to use hardware breakpoints to set breakpoints in the Linux kernel core and drivers (because with XIP Linux, the kernel code runs directly from ROM).

In GDB, it seems I can use the 'hbreak' command to set hardware breakpoints, but sometimes I have to set them manually using 'monitor setbp'.

Since GDB does not know about the 'monitor setbp' breakpoints, is there a Jlink command that will list my current hardware breakpoints?

(or do I have to manually read the BCR/BVR registers in the break controller to find that out)

Thanks,
Chris

> In which cases is it not possible?

Let's say you want to set a breakpoint in a kernel driver init function, and you want to set it before the kernel boots. But, before the kernel boots, the MMU is not set up so GDB/JLINK complains that it cannot read/access those 'virtual' address. So, you have to set the HW breakpoint manually using monitor setbp.

> I do not see why flash breakpoints should not work in your case.
The RZ/A1 devices does not have internal Flash. It fetches instructions from an external SPI flash. Further, the SPI flash interface is set up in a special XIP (Execute in place) mode in order to allow the CPU to do direct fetches from it. Therefore, you have to use 'hbreak' to tell GDB to explicitly only use the HW breakpoints in Coresight because re-writting flash is not an option.

> [Windows host system only] All Breakpoint which were set using J-Link are listed in the J-Link Control Panel tab "Breakpoints".
OK, so I'm out of luck for Linxu host debugging.

Thank you.