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Date:      Fri, 27 Mar 2009 11:34:28 +1030
From:      "Daniel O'Connor" <doconnor@gsoft.com.au>
To:        freebsd-stable@freebsd.org
Cc:        Ronald Klop <ronald-freebsd8@www.klop.ws>, Andriy Gapon <avg@icyb.net.ua>
Subject:   Re: remote debug over usb vs. old serial cable?
Message-ID:  <200903271134.37209.doconnor@gsoft.com.au>
In-Reply-To: <49CB8FAC.4080505@icyb.net.ua>
References:  <op.uregvzva8527sy@82-170-177-25.ip.telfort.nl> <20090326130634.GA36270@owl.midgard.homeip.net> <49CB8FAC.4080505@icyb.net.ua>

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On Friday 27 March 2009 00:52:36 Andriy Gapon wrote:
> > USB won't work for that purpose.  It requires far too much kernel suppo=
rt
> > to be useful after a panic.
>
> Erik,
> in fact, there is a special USB (EHCI) mode for such purposes:
> http://www.coreboot.org/EHCI_Debug_Port

That's pretty neat :)

The dongle is pretty expensive relative to the cost of a Firewire card thou=
gh.

> But that requires some special HW in addition to SW support which our
> doesn't have.
>
> BTW, Ronald, it is possible that you might have a serial header on
> motherboard which is not connected to any traditional port.

You could also purchase a Firewire PCI (or PCIe) card, they aren't very=20
expensive.

=2D-=20
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C


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