Re: ping fails under 2.1.39
H. Peter Anvin (hpa@transmeta.com)
23 May 1997 22:15:47 GMT
Followup to: <Pine.LNX.3.91.970523102506.116A-100000@chaos.analogic.com>
By author: "Richard B. Johnson" <root@analogic.com>
In newsgroup: linux.dev.kernel
>
> Also, the method used by the kernel to delay I/O (writing to an unused port)
> can (read will) lead to other problems. You should not perform a bus
> operation if you intend to allow the bus to settle. It makes more glitches
> that take even more time to settle. The result is that, although you have
> compensated for a chip-to-chip select-time bug with the delay, the resulting
> bus activity can cause invalid reads/writes during this operation.
>
> Note:
> I am taking about the ISA bus!!! The high-speed bus, either Vesa-Local
> or PCI do not have these bus-settle problems. Further, "modern" 8390 clones
> don't have the the chip-to-chip select-time bug. Basically, if you have
> a PCI card that is "NE*" compatible (uses an 8390), you should not have
> ethernet problems due to this card. If you have an old ISA Ethernet card
> that uses an 8390, you should "repair" it using a hacksaw so it doesn't
> find its way into some other computer. New 8390 PCI boards cost US$15.
>
It is writing to an unused *motherboard* port. It should not cause
activity on the ISA bus as far as I understand.
-hpa
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