Port 1 of USB EHCI controller is not physically exposed, how to expose it, to debug
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 ke=
rnel debugging on some machines. For Windows 8 I believe one of the certifi=
cation 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 beli=
eve 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 ski=
lls (soldering surface mount, or using micro grabber clips). The board manu=
facturer also may have already brought the chip pins to some pads in a 10 p=
in 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 exi=
st). Having a few extra PCB traces costs essentially nothing per systems, b=
ut 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 success=
fully 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).=20
If you have lots of cash, I believe there are debuggers that connect via th=
e 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.=20
From: firstname.lastname@example.org [mailto:email@example.com=
sr.com] On Behalf Of firstname.lastname@example.org
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
Recently I purchased one board of Gigabyte=20
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 syste=
m 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 a=
ll the document of USB debug. Like
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 thr=
ough 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 an=
d I think Windows 8 is require for that.
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