Messages in this thread | | | From | (H. Peter Anvin) | Subject | Re: ping fails under 2.1.39 | Date | 23 May 1997 22:15:47 GMT |
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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.
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