Be sure to still support separate gdb servers for each separate device on the scan chain. For example, the nVidia Tegra II has a dual core A9 and an arm7 peripheral/ power controller.
Øyvind Harboe <oyvind.har...@zylin.com> wrote: Just some thoughts on multicore interface to debuggers... GDB server: Today OpenOCD has support for multiple CPUs that lends itself towards heterogeneous multiprocessor systems. I don't think there are many of those that OpenOCD can support. Also the current support creates one GDB server for each CPU. This would be terribly awkward to work with. I think a better approach would be to represent each CPU as a thread via the gdb remote protocol. GDB GUI interfaces know how to deal with multiple threads for a single processor, thus it should be possible to add support for multicore systems without changing the GDB GUI's. Use case: presumably the goal is to debug multicore Linux kernels. Is there realistically any other operating system that would run on a Cortex A9 w/4 cores and gigabytes of memory? I think it would be healthy to set aside some time to do Linux kernel debugging with single core systems and document best practices there and outline the most annoying problems and the best tricks. In addition to target support, can OpenOCD "do more" towards making kernel debugging smoother? An interesting feature would be to be able to step into kernel fn's from user space and back again, all with source code :-) Some links: http://elinux.org/BeagleBoardOpenOCD http://www.eetimes.com/design/embedded/4207333/Debugging-the-Linux-kernel-with-JTAG http://elinux.org/DebuggingTheLinuxKernelUsingGdb -- Øyvind Harboe US toll free 1-866-980-3434 / International +47 51 63 25 00 http://www.zylin.com/zy1000.html ARM7 ARM9 ARM11 XScale Cortex JTAG debugger and flash programmer _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development _______________________________________________ Openocd-development mailing list Openocd-development@lists.berlios.de https://lists.berlios.de/mailman/listinfo/openocd-development
