From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Warren Subject: Re: JTAG debugging the linux kernel on tegra3 platforms Date: Wed, 26 Mar 2014 12:23:12 -0600 Message-ID: <53331B10.3030904@wwwdotorg.org> References: <5332E13D.3070907@yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <5332E13D.3070907-/E1597aS9LQAvxtiuMwx3w@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Alexander Oh , linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-tegra@vger.kernel.org On 03/26/2014 08:16 AM, Alexander Oh wrote: > Hi! > > I'm currently trying to debug a QuadMo747-X T30. I'm trying to update > the versions of u-boot and linux kernel. I run into problems while > booting the kernel (similar to [2], but I'm not sure whats going on yet) > and was hoping to get some help here about JTAG debuggers. Turning on earlyprintk is hopefully the simplest way to debug this; see the details in the thread you linked to. > I've seen that people are already running the flyswatter2 JTAG debuggers > with the nvidia tegra2 [1]. Is this debugger also working with the > nvidia tegra3? I found out that James Zhao has been working on OpenOCD > to get the Tegra3 running. But I could not find any references or > manuals to get it working. I'm not entirely sure that the debugger is > compatible with tegra3 processors. > > Is anybody here actually using a flyswatter2 debugger with a tegra3 > processor? While my OpenOCD config files imply that I did try it on some Tegra30 device in the past, I haven't ever had much good luck with using it on the main CPUs. I certainly have done some simple operations on the AVP/boot processor, but not much worked on the A9s. This might be user error, or might not; I'm not sure. This isn't an area I've put much time into understanding.