Messages in this thread | | | Date | Wed, 8 Jan 2003 14:44:42 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: tenth post about PCI code, need help |
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On 8 Jan 2003, H. Peter Anvin wrote:
> Followup to: <Pine.LNX.3.95.1030108132812.28791A-100000@chaos.analogic.com> > By author: "Richard B. Johnson" <root@chaos.analogic.com> > In newsgroup: linux.dev.kernel > > > > The problem is that he's discovered something that's not supposed > > to be in the code. Only 32-bit accesses are supposed to be made to > > the PCI controller ports. He has discovered that somebody has made > > some 8-bit accesses that will not become configuration 'transactions' > > because they are not 32 bits. > > > > Right. That's what the code is checking for. > > -hpa
Somebody is very lucky the designer of the bus interface state-machine let him get away with it. This is a borderline "insane instruction" that could, on some (future?) machine, require a power-off to recover. This is NotGood(tm). It's like testing a fuse by shorting out a circuit. If it works, the circuit no longer works. If I doesn't, the circuit no longer works. Some things should not be tested.
Cheers, Dick Johnson Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips). Why is the government concerned about the lunatic fringe? Think about it.
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