Date: Thu, 26 Mar 2009 15:33:49 +0100 From: "Ronald Klop" <ronald-freebsd8@klop.yi.org> To: "Andriy Gapon" <avg@icyb.net.ua>, "Erik Trulsson" <ertr1013@student.uu.se> Cc: freebsd-stable@freebsd.org Subject: Re: remote debug over usb vs. old serial cable? Message-ID: <op.urelenv68527sy@82-170-177-25.ip.telfort.nl> 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 Thu, 26 Mar 2009 15:22:36 +0100, Andriy Gapon <avg@icyb.net.ua> wrote: > on 26/03/2009 15:06 Erik Trulsson said the following: >> On Thu, Mar 26, 2009 at 01:56:13PM +0100, Ronald Klop wrote: >>> Hello, >>> >>> In the past I could catch a panic during boot via a serial cable >>> connected >>> to another computer. >>> My new computer only has USB-ports and ethernet. What kind of cable do >>> I >>> need now to do remote debugging? >>> The old computer also has usb, so I think the connection should be in >>> that >>> corner. >>> They all run 7-STABLE. >> >> USB won't work for that purpose. It requires far too much kernel >> support 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 > > 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. Is that this sio0 one? sio0: configured irq 4 not in bitmap of probed irqs 0 sio0: port may not be enabled sio0: configured irq 4 not in bitmap of probed irqs 0 sio0: port may not be enabled sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0 sio0: type 8250 or not responding sio0: [FILTER] sio1: configured irq 3 not in bitmap of probed irqs 0 sio1: port may not be enabled I am going to open my computer tonight to see what is in there. Ronald.
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