From mboxrd@z Thu Jan 1 00:00:00 1970 From: Detlev Zundel Date: Tue, 21 Dec 2010 15:27:24 +0100 Subject: [U-Boot] Debugging uBoot with JTAG/Trace32 ? In-Reply-To: (vijay dixit's message of "Mon, 20 Dec 2010 09:31:57 -0600") References: Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi Vijay, > I am bit new to this field and my query here is understandably a > bit vague. I am particularly interested in how any of you, who have had > experience with uBoot and a JTAG debugger (like a Lauterbach), have gone > about tackling and resolving an issue within uBoot. > > Specifically, I would really appreciate if you could describe the > *problem*encountered within uBoot, and how did the JTAG/Trace32 > debugging help you > resolve the issue. Having a BDI at my disposal, I tackle most of U-Boot related problems with it. But of course a JTAG debugger is indispensible when doing a fresh board port for a "traditionally booting"[1] system. Usually for such a cycle the JTAG NOR flash capability is used to program the development U-Boot and debug it. This continues until U-Boot is able to flash itself. From then on it depends on personal taste whether to use it to debug easier (e.g. driver) problems. Cheers Detlev [1] Out of reset the CPU starts executing instructions from NOR flash -- Die Mengenlehre in der Schule ist daran gescheitert, dass man sie mit ihrem Vokabular verwechselt hat. -- Norbert Treitz -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de