Date: Wed, 10 May 2000 16:57:23 -0600 From: Warner Losh <imp@village.org> To: Peter Jeremy <peter.jeremy@alcatel.com.au> Cc: hackers@FreeBSD.ORG Subject: Re: Can NMI drop a hanging FreeBSD kernel into DDB? Message-ID: <200005102257.QAA95984@harmony.village.org> In-Reply-To: Your message of "Thu, 11 May 2000 07:01:43 %2B1000." <00May11.070143est.115219@border.alcanet.com.au> References: <00May11.070143est.115219@border.alcanet.com.au>
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In message <00May11.070143est.115219@border.alcanet.com.au> Peter Jeremy writes: : 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. I'm not sure why things happen this way. I just know that I've not been able to get a NMI to break into the debugger when certain hardware that I've worked on in the past when it desided to hang. I don't know if that's because this also hung the host bridge so that no interrupt code could fetch it from memory, or what the deal was. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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