Date: Thu, 26 Mar 2009 22:49:19 +0100 From: Philipp Ost <pj@smo.de> To: Ronald Klop <ronald-freebsd8@www.klop.ws> Cc: freebsd-stable@freebsd.org, Andriy Gapon <avg@icyb.net.ua> Subject: Re: remote debug over usb vs. old serial cable? Message-ID: <49CBF85F.90705@smo.de> In-Reply-To: <op.urelenv68527sy@82-170-177-25.ip.telfort.nl> References: <op.uregvzva8527sy@82-170-177-25.ip.telfort.nl> <20090326130634.GA36270@owl.midgard.homeip.net> <49CB8FAC.4080505@icyb.net.ua> <op.urelenv68527sy@82-170-177-25.ip.telfort.nl>
next in thread | previous in thread | raw e-mail | index | archive | help
Ronald Klop wrote: > 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 Yes. Mine (onboard) is recognized in a similar fashion: 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: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0 sio0: type 16550A sio0: [FILTER] sio1: configured irq 3 not in bitmap of probed irqs 0 sio1: port may not be enabled It actually is enabled and working... > I am going to open my computer tonight to see what is in there. You want to look out for a 10 pin connector -- they usually look like jumper connectors (I don't know the correct word in english, in german it's called "Pfostenstecker"). It's even possible that it's there, but not connected in any way -- consult the manual of your mainboard to be sure. Regards, Philipp
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?49CBF85F.90705>