Date: Wed, 10 May 2000 23:10:04 +0200 From: Wilko Bulte <wkb@chello.nl> To: Peter Jeremy <peter.jeremy@alcatel.com.au> Cc: imp@village.org, hackers@FreeBSD.ORG Subject: Re: Can NMI drop a hanging FreeBSD kernel into DDB? Message-ID: <20000510231004.A1871@jedi.wbnet> In-Reply-To: <00May11.070143est.115219@border.alcanet.com.au>; from peter.jeremy@alcatel.com.au on Thu, May 11, 2000 at 07:01:43AM %2B1000 References: <00May11.070143est.115219@border.alcanet.com.au>
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On Thu, May 11, 2000 at 07:01:43AM +1000, Peter Jeremy wrote: > On Fri, 05 May 2000 22:56:42 -0600, Warner Losh <imp@village.org> wrote: > >In message <200005060453.WAA59241@harmony.village.org> 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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