Re: New debug kernel installation mechanism committed to HEAD
On Saturday, 23 October 2004 at 7:26:12 +0900, Hidetoshi Shimokawa wrote:
> 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@FreeBSD.org
>>
>> 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.
>
> You need the following options in your kernel config file to
> enable 'CR' + '~' + '^b' to ddb.
>
> ...
>
> Multi-console support in FreeBSD-5 is very convenient and worth to
> porting to DragonFly. (as you know in loader)
I can confirm that remote debugging over firewire is an excellent way
to go. It's the only way I use any more. I'll be talking about that
on Friday, too, and maybe demonstrating it.
Greg
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