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

[vijay dixit]

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

[Wolfgang Denk]

Dear vijay dixit,

Post by vijay dixit
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.

Post by vijay dixit
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

[Detlev Zundel]

Hi Vijay,

Post by vijay dixit
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