Messages in this thread | | | From | "Jeff Merkey" <> | Subject | Re: Debugging with NMI | Date | Tue, 13 Jul 1999 15:40:28 -0600 |
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This used to work on the older systems. Newer systems that use PCI bridge circuitry don't let you do this because you form a local ground loop when you short the pins, and they've got pull up and pull down logic that will shunt the signal (the system sees it as a short and not an NMI) . Even NMI cards won't work on most systems newer than about 96 that use the newer Intel design.
Good luck.
Jeff
----- Original Message ----- From: Bryn Paul Arnold Jones <bpaj@gytha.demon.co.uk> To: <borislav@ensim.com> Cc: <linux-kernel@vger.rutgers.edu> Sent: Tuesday, July 13, 1999 3:27 PM Subject: Re: Debugging with NMI
> -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Tue, 13 Jul 1999 borislav@ensim.com wrote: > > > In article <fa.e66dv0v.1ch8vqe@ifi.uio.no> you wrote: > > > On an ISA bus machine, if you short out the A1 and B1 pins of an ISA > > > slot you will generate an NMI to the CPU. This interrupts even a > > > > I tried this and nothing happened (the machine is still up, no extra > > output, cat /proc/interrupts says NMI: 0). I'm sure I used the correct > > pins and the right type of paper clip. Any idea what else I might be > > doing wrong? > > > > Your problem is a plug'n'play(tm) paperclip, luckily almost all the > plug'n'play(tm) material is in the surface of the wire. All you need to > do is sandpaper the paperclip to remove the pnp coating and try again. > > The totally plug'n'play paperclips are easy to spot as after a few seconds > of vigorous rubbing, a large ammount of the paperclip will have worn away. > > Please note any "rough hard surface"(tm) will do, as no manufactures of > rough hard surfaces have managed to manufacture a pnp surface coating > which is hard wearing enough to withstand the normal wear and tear which > rough hard surfaces are subject to, and as we know to make the whole > "rough hard surface"(tm) pnp is still too expensive. > > Bryn > - -- > Or words to that effect ... > PGP pubkeys from http://www.gytha.demon.co.uk/pubkey.asc. > > > -----BEGIN PGP SIGNATURE----- > Version: PGPfreeware 5.0i for non-commercial use > Comment: Silly comment here ... > Charset: noconv > > iQA/AwUBN4uvSt94IUtvfSqaEQIUfgCgh3+JdRUcu63oGdFXkUNz5BE5/mkAn1NT > ovddFGPqEiJRFihUGXXnqE3B > =v9u5 > -----END PGP SIGNATURE----- > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.rutgers.edu > Please read the FAQ at http://www.tux.org/lkml/ >
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