[U-Boot] "b reset" does not work in u-boot_v2010.12-rc3 with eldk4.2

[MrGates]

----- Original Message ----- 
From: "Wolfgang Denk" <wd at denx.de>
To: "MrGates" <120368262 at qq.com>
Cc: <u-boot at lists.denx.de>
Sent: Saturday, January 08, 2011 7:41 PM
Subject: Re: [U-Boot] "b reset" does not work in u-boot_v2010.12-rc3 with 
eldk4.2


> Dear "MrGates",
>
> please always keep the mailing list on cc:
   OK, i will.
>
> In message <D9D3B66C8A5547E0BA21713B70C8E8A8 at Microsoft> you wrote:
>> >> These indicate that in start.S,first instruction:b reset not jump 
>> >> success
>> >
>> > What do you mean by that statement?
>>     I am sorry that i have no clear.
>>     I mean that "b reset"statement does not jump to the lable reset at 
>> line 104 of start.S correctly.
>
> If you want to execute machine instructions one by one you should use
> "stepi" instead of "step".
>
>> >> The process just go from one instruction to the next.
>> >
>> > You are running series of "step" commands - you are asking the
>> > debugger to "go from one instruction to the next", and this is what it
>> > does.  What else would you expect?
>>     Maybe i misunderstand the use of "step" command of arm-linux-gdb.
>>     I want gdb to simulate the execution sequence of my u-boot.
>
> gdb does not simulate, it actually runs the code. And the "step"
> command runs the code until it reaches a new source line.
   Yes,you are right.
>
> If you want to step on machine instruction level you should use
> "stepi" instead.
>
> You may also want to read the documentation, for example this section
> of the DULG: http://www.denx.de/wiki/view/DULG/DebuggingTricks
>
   I have seen that above.
>> >> What may be the problem?any suggestions is appreciate.
>> >
>> > Where exactly do you see a problem?
>>     compile success.But when i burn u-boot.bin into my NOR 
>> flash(sst39vf3201).Nothing happened.
>>     So i would like to use arm-linux-gdb(eldk-4.2) with simulating.
>
> Debugging is indeed a good idea in such a situation.  Note that gdb
> does not "simulate". You will need a JTAG adapter to debug on the
> real hardware.
>
   I use SkyEye 1.2.5 cooperates with arm-linux-gdb .
   Now the serial still no output information.
   I thought the u-boot has failed before relocation.
   I do not know where maybe wrong.
   I have checked configs/xxx.h ,start.S many times.
> 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 at denx.de
> The only way to learn a new programming language is by  writing  pro-
> grams in it.                                        - Brian Kernighan
> 
o