Debugging a Serial Driver

WINDBG
1

Hi folks,

is it possible to debug a serial driver? Of course not this one used by the
debug connection itself!

Many thanks in advance.

Regards
Volker

2

2 choices

  • 1394
  • USB 2.0

-----Original Message-----
From: Volker Moebius [mailto:xxxxx@epost.de]
Sent: Tuesday, December 18, 2001 3:14 PM
To: Kernel Debugging Interest List
Subject: [windbg] Debugging a Serial Driver

Hi folks,

is it possible to debug a serial driver? Of course not this one used by
the
debug connection itself!

Many thanks in advance.

Regards
Volker

You are currently subscribed to windbg as: martinez@hp.com
To unsubscribe send a blank email to %%email.unsub%%

3

Hello,

[changed quote]

Martinez, Juan (PSG) wrote:

Volker Moebius wrote:

> is it possible to debug a serial driver? Of course not this one used by
> the debug connection itself!

2 choices

  • 1394
  • USB 2.0

Why this? I’ve heard that the serial port used for debugging is not
driven by the serial driver, but by the kernel itself. There seems to
be evidence in this since the serial driver reports not using that
serial port when the debugger is on (see event log), so I cannot think
of any problem at all debugging the serial driver with WinDBG by any
means.

Tell me if I’m wrong,
Spiro.

4

Possible, I agree yes. Yes you can do debugging of the serial of another
serial port, another driver stack.
But I would recommend using a complete different interface to
avoid/prevent any HW or SW issues.

Good luck,
Juan

-----Original Message-----
From: Spiro Trikaliotis
[mailto:xxxxx@ivs.cs.uni-magdeburg.de]
Sent: Wednesday, December 18, 2002 4:17 PM
To: Kernel Debugging Interest List
Subject: [windbg] RE: Debugging a Serial Driver

Hello,

[changed quote]

Martinez, Juan (PSG) wrote:

Volker Moebius wrote:

> is it possible to debug a serial driver? Of course not this one used
by
> the debug connection itself!

2 choices

  • 1394
  • USB 2.0

Why this? I’ve heard that the serial port used for debugging is not
driven by the serial driver, but by the kernel itself. There seems to
be evidence in this since the serial driver reports not using that
serial port when the debugger is on (see event log), so I cannot think
of any problem at all debugging the serial driver with WinDBG by any
means.

Tell me if I’m wrong,
Spiro.

You are currently subscribed to windbg as: martinez@hp.com
To unsubscribe send a blank email to %%email.unsub%%

5

Many desktop PC has 2 COM port. That’s how we debug the serial driver.
Also, if you run XP, you can debug over 1394 port. This is much faster as well.
Another option is to use SoftICE. I don’t like it myself but it’s an option.

– Kenny

-----Original Message-----
From: Volker Moebius [mailto:xxxxx@epost.de]
Sent: Tuesday, December 18, 2001 1:14 PM
To: Kernel Debugging Interest List
Subject: [windbg] Debugging a Serial Driver

Hi folks,

is it possible to debug a serial driver? Of course not this
one used by the
debug connection itself!

Many thanks in advance.

Regards
Volker

You are currently subscribed to windbg as: xxxxx@synaptics.com
To unsubscribe send a blank email to %%email.unsub%%

6

Hi Volker,

Dein Datum ist ein Jahr zur?ck.

Robin

-----Original Message-----
From: Volker Moebius [mailto:xxxxx@epost.de]
Sent: Tuesday, December 18, 2001 22:14
To: Kernel Debugging Interest List
Subject: [windbg] Debugging a Serial Driver

Hi folks,

is it possible to debug a serial driver? Of course not this one used by the
debug connection itself!

Many thanks in advance.

Regards
Volker

You are currently subscribed to windbg as: xxxxx@exgate.tek.com
To unsubscribe send a blank email to %%email.unsub%%

7

I’m curious as to why you would ask this. Is there some reason you think you
could not debug a serial driver?

And Juan is not correct. You can debug remotely using 1394 or a COM port.
USB is not supported as a kernel debugging option.

–
Gary G. Little
Have Computer, Will Travel …
909-698-3191
909-551-2105

“Volker Moebius” wrote in message
news:xxxxx@windbg…
>
> Hi folks,
>
> is it possible to debug a serial driver? Of course not this one used by
the
> debug connection itself!
>
> Many thanks in advance.
>
> Regards
> Volker
>
>
>
>

8

Many Thanks for *all* the answers!

I’m curious as to why you would ask this. Is there some reason
you think you
could not debug a serial driver?

I believed to have heard that there are limitations in doing so. And because
serial driver is one of the ‘system’- or ‘kernel’ drivers this rumor seemed
to me not to be completely impossible. But now I’m relieved.

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com]On Behalf Of Gary G. Little
Sent: Thursday, December 19, 2002 7:55 PM
To: Kernel Debugging Interest List
Subject: [windbg] Re: Debugging a Serial Driver

I’m curious as to why you would ask this. Is there some reason
you think you
could not debug a serial driver?

And Juan is not correct. You can debug remotely using 1394 or a COM port.
USB is not supported as a kernel debugging option.

–
Gary G. Little
Have Computer, Will Travel …
909-698-3191
909-551-2105

“Volker Moebius” wrote in message
> news:xxxxx@windbg…
> >
> > Hi folks,
> >
> > is it possible to debug a serial driver? Of course not this one used by
> the
> > debug connection itself!
> >
> > Many thanks in advance.
> >
> > Regards
> > Volker
> >
> >
> >
> >
>
>
>
> —
> You are currently subscribed to windbg as: xxxxx@epost.de
> To unsubscribe send a blank email to %%email.unsub%%

9

If you want to debug COM port X you could:

  • Use COM port Y -> basic debugging (host/target) via another serial
    port.*
  • Use WinDbg on the same system (Local mode)
  • Use 1394 -> XP natively supported, check WinDbg help.
  • Use SoftICE, an option, if you do not have neither a secondary COM
    port nor a 1394 option and own a copy of SoftICE. Then you can debug
    locally or even debug over the network.
  • Use USB 2.0 ->
    http://www.intel.com/update/departments/initech/it09021.pdf
  • etc.

+++++++++++++++++++++++++

* One could hit “a buffer overflow or other transmission error by
preventing timely service of the UART” or other HW or SW issues. Hence,
even do there are many options I still stand behind my initial
recommendation for using WinDbg with 1394 in a XP debugging of a serial
port.

Thanks,
Juan

-----Original Message-----
From: Volker Moebius [mailto:xxxxx@epost.de]
Sent: Thursday, December 19, 2002 2:48 PM
To: Kernel Debugging Interest List
Subject: [windbg] Re: Debugging a Serial Driver

Many Thanks for *all* the answers!

I’m curious as to why you would ask this. Is there some reason
you think you
could not debug a serial driver?

I believed to have heard that there are limitations in doing so. And
because
serial driver is one of the ‘system’- or ‘kernel’ drivers this rumor
seemed
to me not to be completely impossible. But now I’m relieved.

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com]On Behalf Of Gary G. Little
Sent: Thursday, December 19, 2002 7:55 PM
To: Kernel Debugging Interest List
Subject: [windbg] Re: Debugging a Serial Driver

I’m curious as to why you would ask this. Is there some reason
you think you
could not debug a serial driver?

And Juan is not correct. You can debug remotely using 1394 or a COM
port.
USB is not supported as a kernel debugging option.

–
Gary G. Little
Have Computer, Will Travel …
909-698-3191
909-551-2105

“Volker Moebius” wrote in message
> news:xxxxx@windbg…
> >
> > Hi folks,
> >
> > is it possible to debug a serial driver? Of course not this one used
by
> the
> > debug connection itself!
> >
> > Many thanks in advance.
> >
> > Regards
> > Volker
> >
> >
> >
> >
>
>
>
> —
> You are currently subscribed to windbg as: xxxxx@epost.de
> To unsubscribe send a blank email to %%email.unsub%%

—
You are currently subscribed to windbg as: martinez@hp.com
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