Messages in this thread | | | Date | Tue, 8 Jan 2008 14:17:49 +0100 (CET) | From | Bodo Eggert <> | Subject | Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override. |
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On Mon, 7 Jan 2008, Alan Cox wrote:
> > But overclocking is not the problem for udelay, it would err to the safe > > side. The problem would be a BUS having < 8 MHz, and since the days of > > 80286, they are hard to find. IMO having an option to set the bus speed > > for those systems should be enough. > > If you get it wrong you risk data corruption. Not good, not clever, not > appropriate. Basically the use of port 0x80 is the right thing to do for > ISA devices and as 15 odd years of use has shown works reliably and > solidly for ISA systems.
As long as there is no port 80 card or a similar device using it. If there is a port 80 card, ISA acess needing the delay does break, cause the data corruption you fear and does cause this thread to be started. Pest, Cholera ...
OTOH, maybe the 6-MHz-delay is the same as the 8-MHz-delay, and the kernel parameter is not needed. -- Fun things to slip into your budget A Romulan Cloaking device: The PHB won't know what it is but will be to chicken to ask
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