You can also spawn a getty on a serial terminal and then run gdb locally on
the target machine.
Of course this assumes that:
1. you have sufficient memory and storage on the target device
2. you are debugging kernel code that executes after the system is fully
initialized
If you don;t want to actually spawn a getty then you can also just redirect
a shell to the serial device.
I've done this directly from "/etc/rc.d/rc.sysinit" in the past.
Good Luck,
Tim McDaniel
----- Original Message -----
From: Tim McDaniel <[EMAIL PROTECTED]>
To: Robert Kaiser <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Saturday, April 01, 2000 1:58 PM
Subject: Re: GDB stub for Linux/x86
> Hi Robert,
>
> I've searched and searched for a way to do this too. It sure would be
> great if somebody had not only the necessary pieces, but a simple HOWTO
doc
> as well. The only GDB information I've seen on this seemed to imply that
> you must run an identical copy of the kernel you wish to debug on the 2nd
> box that you will debugging from. Obviously, this is isn't very useful
if
> your kernel is dying during the boot process. Additionally, I was
> debugging a linux kernel for our Internet appliance (MediaGX/CS5530).
> Luckily I was able to get my kernel code up and running using printk
> through a serial tty device. In some cases - especially very early during
> the boot process, you'll have to write directly to the serial port. I
> never trashed the boxes boot code sufficiently to need to hack linux to
> support dedicated serial input.
>
> VxWorks supports serial debugging so I'm certain there is a better way
than
> what I've described above, as well all know what a piece of crap VxWorks
is.
> The only thing VxWorks has in common with linux are a decent GNU
development
> environment a at least a few cases where they've stolen linux code. In
> fact, we nailed them on this and used it to force WindRiver to give us
their
> PPP source, which they had previously refused to do.
>
> Good Luck and let us all know what you discover,
> Tim McDaniel
>
>
> ----- Original Message -----
> From: Robert Kaiser <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Saturday, April 01, 2000 11:42 AM
> Subject: GDB stub for Linux/x86
>
>
> > Hi everyone,
> >
> > I would like to remote-debug a Linux/i386 kernel via serial line.
> > What I need is a suitable debug stub for GDB to patch into the linux
> > kernel source. I'm almost sure that someone must have done this
> > before, but I was unable to find anything suitable with the usual
> > search engines. Does anyone in this group have a hint for me ?
> >
> > Thanks in advance!
> >
> > Rob
> >
> > ------------------------------------------------------------
> > Robert Kaiser rkaiser AT sysgo DOT de
> > Sysgo RTS GmbH
> > Mainz, Germany
> >
> >
> > --
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> > with the command "unsubscribe linux-embedded" in the message body.
> > For more information, see <http://waste.org/mail/linux-embedded>.
> >
>
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