Re: Can NMI drop a hanging FreeBSD kernel into DDB?

[Wilko Bulte]

On Thu, May 11, 2000 at 07:01:43AM +1000, Peter Jeremy wrote:
> On Fri, 05 May 2000 22:56:42 -0600, Warner Losh <[EMAIL PROTECTED]> wrote:
> >In message <[EMAIL PROTECTED]> Warner Losh writes:
> >: However, it won't work if you are hacking pci hardware and manage to
> >: hang the PCI bus.
> >
> >Unless, of course, the trap handler is in cache as well as the
> >debugger routines you need.
> 
> I thought the PCI bus was isolated from the CPU<->memory bus so this
> couldn't occur.  The trap handler should start OK, but just can't do
> any I/O because the PCI bus is hung.

And if you force the IOCHK* line on an AT slot to GND? Would that work
on modern PCI machines? I used to do this on older EISA boxes.

-- 
Wilko Bulte     FreeBSD, the power to serve     http://www.freebsd.org
                                                http://www.tcja.nl


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