kgdb for x86_64 2.6 kernels
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Quoted 7 lines · George Anzinger
Quoted 5 lines
Raw USB? Or some kind of USB to serial device?
Remember, USB needs interrupts to work, see the kdb patches for the mess
that people have tried to go through to send usb data without interrupts (doesn't really work...)I gave up on USB when I asked the following questions:
There is a special "USB debugport" specification available that allows to drive USB very simply using PIO without too much set up. It should be implemented in most chipsets by now because that other operating system is using it.
See e.g. http://www.usb.org/developers/presentations/pres0602/john_keys.pdf
It works with a simple "debug dongle", that is identical to the USB networking cables that are often sold cheaply.
If you want to port kgdb to use USB I would use that. USB console would also be very useful for debugging laptops and some systems with no USB.
-Andi
Quoted 17 lines · Andi Kleen
Quoted 7 lines · George Anzinger
Quoted 5 lines
Raw USB? Or some kind of USB to serial device?
Remember, USB needs interrupts to work, see the kdb patches for the mess
that people have tried to go through to send usb data without interrupts (doesn't really work...)I gave up on USB when I asked the following questions:
There is a special "USB debugport" specification available that allows to drive USB very simply using PIO without too much set up. It should be implemented in most chipsets by now because that other operating system is using it.
Quoted 7 lines
See e.g. http://www.usb.org/developers/presentations/pres0602/john_keys.pdf
It works with a simple "debug dongle", that is identical to the USB networking cables that are often sold cheaply.
If you want to port kgdb to use USB I would use that. USB console would also be very useful for debugging laptops and some systems with no USB.
Now that is interesting. As I read it, the debug port is programed the same way in all the USB chips (given it exists at all). AND it is much easier to use. Anyone care to put together a polling driver that makes it look like RS232 on the host end given that we use a controller to controller cable?
Signature · 3 lines
George Anzinger [email protected] High-res-timers: http://sourceforge.net/projects/high-res-timers/ Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml
Quoted 2 lines · George Anzinger
Now that is interesting. As I read it, the debug port is programed the same way in all the USB chips (given it exists at all). AND it is much
Yep, it's not PIO, but polled MMIO. Sorry for spreading misinformation.
Quoted 3 lines
easier to use. Anyone care to put together a polling driver that makes it look like RS232 on the host end given that we use a controller to controller cable?
I suspect all laptop users with kernel bugs will admire whoever does that ;-)
-Andi
Quoted 11 lines · Andi Kleen
Quoted 2 lines · George Anzinger
Now that is interesting. As I read it, the debug port is programed the same way in all the USB chips (given it exists at all). AND it is much
Yep, it's not PIO, but polled MMIO. Sorry for spreading misinformation.
Quoted 3 lines
easier to use. Anyone care to put together a polling driver that makes it look like RS232 on the host end given that we use a controller to controller cable?
I suspect all laptop users with kernel bugs will admire whoever does that ;-)
I've been thinking about doing this, may get around to it eventually.
Signature · 1 line
Matt Mackall : http://www.selenic.com : Linux development and consulting
On Thu, 15 Jan 2004 19:15:10 -0600 Matt Mackall <[email protected]> wrote:
| On Thu, Jan 15, 2004 at 09:52:17AM +0100, Andi Kleen wrote: | > On Thu, Jan 15, 2004 at 12:36:58AM -0800, George Anzinger wrote: | > > Now that is interesting. As I read it, the debug port is programed the | > > same way in all the USB chips (given it exists at all). AND it is much | > | > Yep, it's not PIO, but polled MMIO. Sorry for spreading misinformation. | > | > > easier to use. Anyone care to put together a polling driver that makes it | > > look like RS232 on the host end given that we use a controller to | > > controller cable? | > | > I suspect all laptop users with kernel bugs will admire whoever does that ;-) | | I've been thinking about doing this, may get around to it eventually.
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I'd like to help also, but I don't have ICH4 or other usb-debug hardware AFAIK.
--
~Randy
Everything is relative.
Quoted 2 lines
I'd like to help also, but I don't have ICH4 or other usb-debug hardware AFAIK.
I suspect other vendors with EHCI support have it too. Check some data sheets.
-Andi