Re: Excellent job on the firewire support!

Hi,

Anyone has experience with the newly added IP over 1394 support, i.e. fwip?

I compiled it in with the latest kernel at 17 July, but the box cannot ping with a M$ & linux box.

--- Doug Rabson <dfr_at_nlsystems.com> wrote:
> On Sunday 18 July 2004 20:54, Andrew Gallatin wrote:
> > Doug Rabson writes:
> >  > On Sunday 18 July 2004 18:51, Andrew Gallatin wrote:
> >  > > Hi,
> >  > >
> >  > > I just wanted to say that I used FreeBSD's firewire and sbp-II
> >  > > support for the first time this weekend.  It seems to be fast
> >  > > (over 26MB/sec writes, 34MB/sec reads to a LaCie 160GB drive),
> >  > > and robust. It works well on non-i386 platforms -- I'm using it
> >  > > to back up an amd64, and to serve as a root device for a
> >  > > FreeBSD/powerpc  machine.
> >  > >
> >  > > All in all, it totally exceeded my expectations.  Thank you very
> >  > > much|
> >  >
> >  > Wait till you try debugging using gdb over firewire with dcons. An
> >  > all round positive experience :-)
> >
> > It would be nice to remove my Comtrol Rocketport serial card, and the
> > 8 serial cables leading across the middle of the room to my shelf of
> > machines and replace it with one firewire cable leading to a firewire
> > hub. But, as a firewire newbie, I have some questions:
> >
> > 1) Is any firewire PCI adapter just as good as any other in terms of
> >    performance, and FreeBSD support? (prices seem to range from $10
> > to $100)
> 
> Any should do about as well as any other. I probably wouldn't want to 
> spend more than ~$50 on one.
> 
> >
> > 2) Is dcons usable after a panic (ie, DDB or KDB_TRACE)?  Or is it
> >    only usable for remote-gdb?
> 
> Dcons provides two full duplex streams - one for console and one for 
> gdb. You can use DDB on the console just like normal.
> 
> >
> > 3) Is dcons endian and pointer-size agonstic?  Can I run consoles to
> >    an amd64 and a powerpc box from an x86?
> 
> I haven't actually tried that and I imagine that there might be issues 
> here and there. Any problems are likely to be in the dconschat program 
> but that should be pretty easy to fix since its entirely userland.
> 
> >
> > 4) Does the loader know about dcons?  Eg, can I do "unload <ret> boot
> >    kernel.test" using dcons?
> 
> Actually thats the only downside of dcons. It doesn't cut in until the 
> firewire controller attaches. It relies on the fact that the fwohci 
> driver allows access to physical memory from any node on the bus 
> (implemeted in hardware so you can examine the memory of a hung 
> machine). The dconschat program uses this feature to access the dcons 
> ring buffers in the target machine.
> 
> I could imagine a dcons driver in the loader which just enabled physical 
> access and used some kind of loader trick to hand off the ring buffers 
> to the kernel dcons driver. It doesn't exist though - say nice things 
> to the author and he might find the time for it :-)
> 
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