Re: Memory speed -- change on the fly??

David Wragg (dpw@doc.ic.ac.uk)
Sat, 4 Apr 1998 19:30:30 +0100

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Chris Evans <chris@ferret.lmh.ox.ac.uk> writes:
> Hi,
>
> Here's a crazy question. I have a running system on which I want to change
> the motherboard's chipset memory speed from 60ns->70ns. Normally this is
> of course done through the BIOS, but presumably this simply hits a config
> register with an outb() or similar. It is a standard BIOS (Award) with
> standard TX chipset.
>
> I'm mad, I know, but can I change this without physically going to the
> machine and rebooting??

Download the TX chipset manuals from Intel's web site. I have the FX
manual, and it describes details of the registers in the memory
contoller.

Note that it won't say set register x to y for 60ns or z for
70ns. There is quite a lot more technical detail than that. Possibly
you could write some code to printk the values of the relevant
registers, and then manually set your BIOS to see what its settings
mean in terms of register values.

Dave Wragg.

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