Kernel debug about Linux for PowerPC

Kernel debug about Linux for PowerPC

[Shuangjun Zhu]

Hello,

I want to use the gdb to debug the kernel version 2.2.13 for my MPC860
board.
So I set the compiler configuration parameter CONFIG_KGDB = YES,
but when I re-compile the kernel, it complains that

arch/ppc/kernel/kernel.o(.text+0x68ac): undefined reference to
`getDebugChar'
arch/ppc/kernel/kernel.o(.text+0x6934): undefined reference to
`putDebugChar'

PROBLEM:
what's wrong? I find no define for function "getDebugChar" in arch/ppc
directory.

Any suggestion is appreciated!

BRs,
Shuangjun


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Re: Kernel debug about Linux for PowerPC

[Momchil Velikov]

Shuangjun Zhu wrote:
>
> Hello,
>
> I want to use the gdb to debug the kernel version 2.2.13 for my MPC860
> board.
> So I set the compiler configuration parameter CONFIG_KGDB = YES,
> but when I re-compile the kernel, it complains that
>
> arch/ppc/kernel/kernel.o(.text+0x68ac): undefined reference to
> `getDebugChar'
> arch/ppc/kernel/kernel.o(.text+0x6934): undefined reference to
> `putDebugChar'
>
> PROBLEM:
> what's wrong? I find no define for function "getDebugChar" in arch/ppc
> directory.

You have to write these functions yourself. The stub uses them to
communicate with the debugger through whatever device is available on
the board. See 'Targets' -> 'Remote' -> 'Remote Serial' in GDB docs.

Regards,
-velco

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Re: Kernel debug about Linux for PowerPC

[Dan Malek]

Momchil Velikov wrote:

> You have to write these functions yourself.

No, you don't.  Just download the kernel sources for
linuxplanet-2.2.13 from MontaVista (ftp.mvista.com).
It has the kgdb support.


	-- Dan

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Re: Kernel debug about Linux for PowerPC

[Momchil Velikov]

Dan Malek wrote:
>
> Momchil Velikov wrote:
>
> > You have to write these functions yourself.
>
> No, you don't.  Just download the kernel sources for
> linuxplanet-2.2.13 from MontaVista (ftp.mvista.com).
> It has the kgdb support.

Yep, you don't have to, iff some kind soul has already written
these for your particular device on your particular board ;-)

Regards,
-velco

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Re: Kernel debug about Linux for PowerPC

[Shuangjun Zhu]

Hello, everyone

I could not find linuxplanet-2.2.13 from ftp.mvista.com.
Does anyone know where can I get it?

Thanks in advanced!
Shuangjun


>
>Momchil Velikov wrote:
>
>> You have to write these functions yourself.
>
>No, you don't.  Just download the kernel sources for
>linuxplanet-2.2.13 from MontaVista (ftp.mvista.com).
>It has the kgdb support.
>
>
> -- Dan


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