remote debugging?

remote debugging?

[Andreas Tobler]

Hi,

I try to remote debugging a kernel.
Configuration as follows:

pm7200 Linux <------ serial cable------> PowerBook MacOS ZTerm

the physical Link is ok, when cat'ing a file to /dev/ttyS1 I get it on
the ZTerm window.

But when I boot with BootX I add the kernel args 'console=/dev/ttyS1' in
the corresponding field.

The first stage text I see on the pm7200, afterwards Tux comes up and no
booting messages are seen either on the pm7200 (what I expect) nor on
the ZTerm window. (what I don't expect).

The serial settings are as described in the xmon.txt 38400N81
The kernel is compiled with xmon included, the one I test boots and is a
2214pre18. It's only to find out how 'remote' works.

Any ideas/experiences?

Thanks in advance,

Andreas
-- 
| Andreas Tobler				
| CH-8004 Zuerich 							
| E-Mail:   a.tobler@schweiz.ch
-----------------------------------------------


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Re: remote debugging?

[Charles Lepple]

Andreas Tobler wrote:
[...]
> The kernel is compiled with xmon included, the one I test boots and is a
> 2214pre18. It's only to find out how 'remote' works.

Once you have a kernel with xmon support, you can generate an NMI
(command-power, I believe) and that drops you into xmon (assuming the
machine is not too far gone). In addition, xmon will come up when a
fatal exception occurs, or when you put a xmon(0) call into a function
in the kernel.

When debugging an embedded system, I just put a bunch of xmon(0) calls
at strategic locations, and when I got close to where the system was
hanging, I poked around with xmon.

Paul Mackerras wrote some documentation for xmon that you may want to
check out. It doesn't seem to be in Documentation/ but it's probably at
linuxppc.cs.nmt.edu or something (search the mail archives -- it has
been discussed before).

-- 
Charles Lepple
clepple@mitre.org


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Re: remote debugging?

[Andreas Tobler]

Charles Lepple wrote:
> 
> Andreas Tobler wrote:
> [...]
[...] 
> Paul Mackerras wrote some documentation for xmon that you may want to
> check out. It doesn't seem to be in Documentation/ but it's probably at
> linuxppc.cs.nmt.edu or something (search the mail archives -- it has
> been discussed before).

This docu I have.
Thanks for the answer. But my problem is much earlier I think.

I'd like to redirect the console output from the boot of my pm7200 to
the serial port. This is what doesn't work.
Neither the printer nor the modem port. 

When the system is up, I can check the physical connection which works.

Isn't it possible to get the boot output to the serial port written?

Andreas
 
-- 
| Andreas Tobler				
| CH-8004 Zuerich 							
| E-Mail:   a.tobler@schweiz.ch
-----------------------------------------------

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Re: remote debugging?

[Olaf Hering]

On Thu, Jan 06, Andreas Tobler wrote:

> Charles Lepple wrote:
> > 
> > Andreas Tobler wrote:
> > [...]
> [...] 
> > Paul Mackerras wrote some documentation for xmon that you may want to
> > check out. It doesn't seem to be in Documentation/ but it's probably at
> > linuxppc.cs.nmt.edu or something (search the mail archives -- it has
> > been discussed before).
> 
> This docu I have.
> Thanks for the answer. But my problem is much earlier I think.
> 
> I'd like to redirect the console output from the boot of my pm7200 to
> the serial port. This is what doesn't work.
> Neither the printer nor the modem port. 
> 
> When the system is up, I can check the physical connection which works.
> 
> Isn't it possible to get the boot output to the serial port written?

I had such a configuration a few days ago. 7200 -> ix86 with a usual
modem cable.

You need a kernel with support for PowerMac serial port and console on
serial port.
Then give the arguments like described in
Documentation/serial-console.txt :

console=ttyS0,19200 and you will see an output on your console and the
penguin on your screen. It should be possible to log both to serial and
to the screen.

For a first test you should setup a serial login to check the settings
in zterm. Add a line like this in your inittab:
t:23:respawn:/sbin/agetty -L -h 19200

The 23 mean the runlevels and might be different on a RedHat system.
If you can login to your 7200 then the cable and the settings in zterm
are ok. Somehow you always get a little garbage when you login from a
Mac to another Mac. This does not occour from a ix86 machine, I don't
know why.



Gruss Olaf

-- 
 $ man 1 current_release

BUGS
       Users never read manuals...

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Re: remote debugging?

[Geert Uytterhoeven]

On Fri, 7 Jan 2000, Olaf Hering wrote:
> console=ttyS0,19200 and you will see an output on your console and the
> penguin on your screen. It should be possible to log both to serial and
> to the screen.

That's `console=ttyS0 console=tty0' (or vice versa). The first one is used for
single user/emergency shells.

Gr{oetje,eeting}s,
--
Geert Uytterhoeven -- Linux/{m68k~Amiga,PPC~CHRP} -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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Re: remote debugging?

[Geert Uytterhoeven]

On Thu, 6 Jan 2000, Andreas Tobler wrote:
> I try to remote debugging a kernel.
> Configuration as follows:
> 
> pm7200 Linux <------ serial cable------> PowerBook MacOS ZTerm
> 
> the physical Link is ok, when cat'ing a file to /dev/ttyS1 I get it on
> the ZTerm window.
> 
> But when I boot with BootX I add the kernel args 'console=/dev/ttyS1' in
> the corresponding field.
> 
> The first stage text I see on the pm7200, afterwards Tux comes up and no
> booting messages are seen either on the pm7200 (what I expect) nor on
> the ZTerm window. (what I don't expect).

And you did enable CONFIG_SERIAL_CONSOLE?

I'm not 100% sure that it works on PowerMac (don't have one), but at least
CONFIG_SERIAL_CONSOLE is in the macserial code.

Gr{oetje,eeting}s,
--
Geert Uytterhoeven -- Linux/{m68k~Amiga,PPC~CHRP} -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds


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