Yes, LAN debug is Windows 8 only. And like Don said, it’s quite common USB port 1 is not physically accessible. There may not be able any way to do kernel debugging on some machines. For Windows 8 I believe one of the certification tests now requires there be a way to do kernel debugging.
A thing laptops sometimes do have is an internal mini PCIe slot, and I believe I’ve seen cables than can plug into this connector that let you plug a normal 1x PCIe card into. This might allow using 1394 debugging on laptops with a mini-PCIe slot. A quick google search actually says startech makes a mini-PCIe 1394 card.
If you’re a hardware type, the south bridge chip often has a legacy serial port on the internal LPC bus, and in theory you could connect a logic level (i.e. 3.3V not RS232 12V) serial dongle to the chipset pins, even if these pins are normally not externally exposed. I’ve never done this personally but once considered the idea and it seems possible with the right board skills (soldering surface mount, or using micro grabber clips). The board manufacturer also may have already brought the chip pins to some pads in a 10 pin header pattern and a drill and solder is all that’s needed to make them accessible (you still need a logic level to USB serial dongle, but they exist). Having a few extra PCB traces costs essentially nothing per systems, but adding the connector does, so is left off production systems.
Some laptops (pretty rare now) do have cardbus/expresscard slots which you can get 1394 cards for.
Is there some reason you can’t do the debugging under Win 8, as it does add other debugger transports, like some NICs and USB 3.
My experience of USB 2 debugging has been it essentially doesn’t work. I’ve seen USB 2 debugger connections run for 10 minutes, but I’ve NEVER successfully used one for real work.
A few tips I heard to help USB debugging, which I haven’t tried: be sure to use the busparams option to select a specific chip and turn off ALL use of USB from the bios (things like settings for USB legacy support).
If you have lots of cash, I believe there are debuggers that connect via the processor socket. It’s been years since I used one of these, and a while ago they cost like $50,000+. How bad do you want to debug THAT machine.
Jan
-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of xxxxx@gmail.com
Sent: Saturday, July 07, 2012 4:39 AM
To: Kernel Debugging Interest List
Subject: [windbg] Port 1 of USB EHCI controller is not physically exposed, how to expose it, to debug
Hi
Recently I purchased one board of Gigabyte
Model : GA-Z77M-D3H
BIOS : American Megatrends
BIOS Version : F7
BIOS ID : 8A01AG0L
I gone through all the settings of USB debug for both Target and Host system with USB 2.0 debug cable.
But when I reached to USB View page , the port 1 of USB 2.0 EHCI controller is not coming or not physically exposed.
So how to enable or expose port 1 of USB EHCI controller, as explained in all the document of USB debug. Like
http://msdn.microsoft.com/en-us/library/windows/hardware/ff556869(v=vs.85).aspx
http://blogs.msdn.com/b/usbcoreblog/archive/2010/10/25/setting-up-kernel-debugging-with-usb-2-0.aspx
http://www.codeproject.com/Articles/132313/How-to-Debug-the-Windows-OS-using-USB?fid=1598835&df=90&mpp=25&sort=Position&tid=3980455
http://www.apriorit.com/our-company/dev-blog/210-win-debug-with-usb
Where I?m wrong don?t know, but till now what I understand is that might be there is a problem with my BIOS,
So please suggest me the best way to start the Windows Driver debugging through USB 2.0 debug cable.
Else is there any other best known method, but I have system with USB only as one is Laptop and that to without any null modem & 1394 port.
Thus I must have to use USB debug only. I don?t want to go for Lan debug and I think Windows 8 is require for that.
Thanks
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