[Qemu-devel] Re: How to debug Linux kernel on qemu with kgdb?

[Neo Jia]

On 4/25/07, Jan Kiszka <address@hidden> wrote:
> Neo Jia wrote:
> > On 4/25/07, Jan Kiszka <address@hidden> wrote:
> >> Neo Jia wrote:
> >> > hi,
> >> >
> >> > I am trying to use debug kgdb patched linux kernel on my qemu. Both
> >> > the native and target platform are IA32. I am wondering if there is
> >> > anyone can show me the procedure?
> >>
> >> Yep, see https://mail.gna.org/public/xenomai-core/2006-09/msg00202.html
> >>
> >> (BTW, I think that kgdb bug is still unfixed - I never got a feedback.)
> >
> > I can connect gdb through /dev/pts/XX. My qemu is lanuched by
> >
> > qemu -nographic -hda linux.img -kernel
> > ./2.6.15.5-kgdb/vmlinuz-2.6.15.5-kgdb -serial pty -append "kgdbwait
> > console=ttyS0 root=/dev/hda sb=0x220,5,1,5 ide2=noprobe ide3=noprobe
> > ide4=noprobe ide5=noprobe"
> >
> > Do you know where can I get the console output?
> >
>
> Use "... -serial stdio -serial pty ..." and attached kgdb to the second
> serial port (I think to recall that is default anyway). The first one is
> then used for the kernel console.

I also tried this but it seems that kgdb cannot connect to /dev/pts/XX
with "-serial stdio".
I did anything wrong?

Thanks,
Neo

> > I would like to work out kgdb + qemu to debug linux kernel.
>
> ??? So you really want to debug the kernel when kgdb is applied, ie.
> actually debug kgdb? If you only intend to debug the kernel itself, qemu
> -s + gdb is enough.
>
> Jan


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