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

12 Jan 2011

      ----- Original Message ----- 
From: "Wolfgang Denk" wd@denx.de
To: "MrGates" 120368262@qq.com
Cc: u-boot@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
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Dear "MrGates",
please always keep the mailing list on cc:
OK, i will.
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In message D9D3B66C8A5547E0BA21713B70C8E8A8@Microsoft you wrote:
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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".
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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.
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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.
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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.
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Best regards,
Wolfgang Denk
-- 
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