We are currently trying to debug our system using a Lauterbach T32 (Powerdebug). However so far, we have not been able to do anything useful.
So far we tried to debug the system as Tegra4 and as CortexA15. When use the Tegra4 settings, we only get a bus error, if we use CortexA15 the debugger cannot connect at all. There is no generic ARMv7 setting.
Has anybody else has any experience using a hardware debugger for the jetson? Unfortunately for T32 there does not seem to be any OpenOCD support.
Currently we are starting u-boot without a boot script, and try to connect with the debugger once the u-boot command prompt appears. Does anybody know which mode the processor should be in at that point? If the processor is started in secure mode and this is not changed, this might explain, why we cannot connect.