Revert r341337; according to imp@ we still support these.
MFC after: 2 weeks Sponsored by: DARPA, AFRL
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@ -1491,8 +1491,17 @@ might be defined to have special handling, and
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might be defined to simply panic and reboot.
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might be defined to simply panic and reboot.
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.El
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.El
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.Sh HINTS
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.Sh HINTS
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On machines with an ISA expansion bus, a simple NMI generation card can be
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constructed by connecting a push button between the A01 and B01 (CHCHK# and
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GND) card fingers.
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Momentarily shorting these two fingers together may cause the bridge chipset to
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generate an NMI, which causes the kernel to pass control to
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.Nm .
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Some bridge chipsets do not generate a NMI on CHCHK#, so your mileage may vary.
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The NMI allows one to break into the debugger on a wedged machine to
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The NMI allows one to break into the debugger on a wedged machine to
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diagnose problems.
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diagnose problems.
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Other bus' bridge chipsets may be able to generate NMI using bus specific
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methods.
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There are many PCI and PCIe add-in cards which can generate NMI for
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There are many PCI and PCIe add-in cards which can generate NMI for
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debugging.
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debugging.
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Modern server systems typically use IPMI to generate signals to enter the
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Modern server systems typically use IPMI to generate signals to enter the
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