[U-Boot] Debugging uBoot with JTAG/Trace32 ?

vijay dixit

20 Dec 2010 20 Dec '10

4:31 p.m.

Hello,

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.

Thanks,

Vijay

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Wolfgang Denk

20 Dec 20 Dec

4:38 p.m.

Dear vijay dixit,

In message AANLkTimACLSNPsCJc7vxmpFrMfAR1VAC_ZcvGYYS_g8p@mail.gmail.com you wrote:

...

     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.

Using a JTAG debugger is for some of as as natural as using a cell phone. Many of us use BDI2000 / BDI3000 or other devices, only few use Lauterbach.

...

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.

I've never used Trace32 before, so I cannot help you with that, sorry.

Best regards,

Wolfgang Denk

-- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de Research is what I'm doing when I don't know what I'm doing. -- Wernher von Braun

Detlev Zundel

21 Dec 21 Dec

3:27 p.m.

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@denx.de

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Detlev Zundel
vijay dixit
Wolfgang Denk