What kernel can i jtag

The most practical way of doing this is to set a hardware breakpoint at the start of the kernel and reset your board using the JTAG reset signal. Your boot loader will initialize your board and the execution will stop at the start of the kernel. After that you can load a kernel into memory and run it. I put beak point on the starting point of my kernel, but the problem is that it won't stop on the breakpoint to let me load the vmlinux file to my memory. Sometimes it works and sometimes it won't.

It seems after resetting my board, I should swiftly pause my program using gdb and again resume it to make it work. Why is this happening?

Have you tried disabling the 'kaslr' option? I am also trying to set a breakpoint but mine never hits. I tried disabling it by passing the 'nokaslr' in bootargs but this does not take effect.

I am not sure if this is the way to go but my gut says that this address mismatch is the reason for the breakpoint not being hit. First of all, connect the JTAG pins on your i.

The next page will ask you for the details on the kernel you built. The kernel symol import wizard will start. But it is an extremely slow debug adapter compared to the previously mentioned ones. The board which should run the firmware must be connected to at least following pins of the debug adapter hardware:.

There is nearly no requirements from OpenWrt but there are several things which can make the debugging a lot easier. The kernel address space layout randomization complicates the resolving of addresses of symbols.

It is highly recommended to start the kernel with the parameter "nokaslr". But this version is missing python support. But it can be enabled with following patch:. This would be in Debian "gdb-multiarch". It should start a telnet server for manual intervention on TCP port , scan the JTAG chains and afterwards start the internal gdbserver on port We will do the latter as we are lazy.

Note the noir and noreset options. See the J-Link documentation included with the download for more info.