[lkml]   [2008]   [Jan]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    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

     \ /
      Last update: 2008-01-08 14:21    [W:0.019 / U:0.820 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site