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    SubjectRe: cyrix 6x86 and ne2000 driver problem
    Hi!

    On Tue, 6 May 1997, Mike Jagdis wrote:

    > > But in fact something working wrong :). As I wrote exchange
    > > cyrix cpu on intel or isa ne2000 on amd pci has solved all my problems.
    > > In a few days I will be able to test pci ne2000. If it will working
    > > fine with cyrix, then the problem is isa delays. Are you agree? Should
    > > I test other isa cards like 3com?
    >
    > The Cyrix CPUs have a configurable delay between I/O instructions
    > which defaults to 32 *bus clock* cycles for the 6x86 (I think the
    > 5x86 is the same). This should be sufficient for normal cases but
    > it could be wrong if (a) the motherboard jumpers aren't set correctly
    > and a smart BIOS tries to adjust the delay, (b) the BIOS knows
    > about 6x86 I/O delays, allows you to configure it, and you get it
    > wrong, (c) you have applied the latest cyrix patch and enabled
    > the fast I/O option.
    >
    > In all these case there will *only* be a problem if the device
    > driver does not include dummy I/O instructions or delay loops
    > in *all* the necessary places.

    I just played with set6x86... Disabling fast IO (i.e.
    32/64 cycles) has no effect. :(


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