Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

From: Alan Cox
Date: Tue Jan 01 2008 - 16:23:36 EST


> How do you find out the speed of the ISA bus? AFAIK there is no
> standardized way to do that. On the Geode SC2200 the ISA bus speed is

It is per chipset magic registers. Fun fun fun

> usually the PCI clock divided by 4 giving 33MHz/4=8.3MHz or
> 30/4=7.5MHz, but with no external ISA devices it's possible to
> overclock the ISA bus to /3 to run it at 11MHz or so. But without

12MHz is valid for ISA although not a good idea - even IBM issued some
systems with 12MHz ISA before discovering many vendors had assumed 8 was
it.
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