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Remove the hint for ISA buses; we don't support them anymore.

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MFC after:	2 weeks
Sponsored by:	DARPA, AFRL
This commit is contained in:
Edward Tomasz Napierala 2018-11-30 11:42:19 +00:00
parent c8b53ced95
commit b7477b1e5f
1 changed files with 1 additions and 10 deletions
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11
share/man/man4/ddb.4
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@ -60,7 +60,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd November 10, 2018
.Dd November 30, 2018
.Dt DDB 4
.Os
.Sh NAME
@ -1491,17 +1491,8 @@ might be defined to have special handling, and
might be defined to simply panic and reboot.
.El
.Sh HINTS
On machines with an ISA expansion bus, a simple NMI generation card can be
constructed by connecting a push button between the A01 and B01 (CHCHK# and
GND) card fingers.
Momentarily shorting these two fingers together may cause the bridge chipset to
generate an NMI, which causes the kernel to pass control to
.Nm .
Some bridge chipsets do not generate a NMI on CHCHK#, so your mileage may vary.
The NMI allows one to break into the debugger on a wedged machine to
diagnose problems.
Other bus' bridge chipsets may be able to generate NMI using bus specific
methods.
There are many PCI and PCIe add-in cards which can generate NMI for
debugging.
Modern server systems typically use IPMI to generate signals to enter the