Re: 32MB BAR Limitation with NT?

[goudreau@dg-rtp.dg.com (Bob Goudreau)]

Dave O'Shea wrote:
 
> But, as I showed in the calculations above, the OS designers were not all
> that "weird" thinking in choossing 32MB as a restriction if in fact it is
> a restriction.   256MB for each device is way to much.    There is just not
> that much memory space around for people to design devices with huge
> memory interfaces because it is either easier, or faster.   

But one could legitimately object to the inflexibility of the practice
of having a *per-BAR* limit at all, versus an overall limit on the
total amount of PCI Memory Space used by all the devices in the system
together.  It seems kind of a shame to "reserve" 32 MB for each
Memory BAR and end up disqualifying a 64 MB BAR even though most or
all of its peers probably use relatively tiny ranges of 1 MB or less
(sometimes *much* less).

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