New debug kernel installation mechanism committed to HEAD

Hidetoshi Shimokawa simokawa at
Fri Oct 22 15:32:05 PDT 2004

You need the following options in your kernel config file to
enable 'CR' + '~' +  '^b' to ddb.

device dcons
device dcons_crom

Because FreeBSD-4/DragonFlyBSD doesn't support multi-console or
switching-console in kernel, dcons has to take the console
at the first stage.

Multi-console support in FreeBSD-5 is very convenient and worth to
porting to DragonFly. (as you know in loader)

/\ Hidetoshi Shimokawa
\/  simokawa at xxxxxxxxxxx

At Fri, 22 Oct 2004 14:27:20 -0700 (PDT),
Matthew Dillon wrote:
> :Have you ever used dconschat(8) with FireWire(4)?
> :
> :It's a nice replacement of serial console and it has some advantage
> :over serial console.
> :
> :- Fast (400Mbps, theoretically)
> :- Support both console and gdb port with only one cable.
> :   (serial console usually need two cables.)
> :- You can manage several target machines with only one 1394 host controller.
> :   (you need to buy multiport or many USB-serial adaptors for serial console.)
> :- You can peek target memory with /dev/fwmem like /dev/mem of localhost.
> :- dcons(4) in loader(8) is now available for FreeBSD.
> :
> :gdb(4) has some example to use them.
> :It's very convenient to use /etc/eui64 to specifying a target.
> :
> :/\ Hidetoshi Shimokawa
> :\/  simokawa at xxxxxxxxxxx
>    I've been able to get a remote getty working over dcons, but as yet have
>    been unable to get console messages to print on it or to be able to break
>    into DDB from it.
> 						-Matt

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