Re: Help! AMCC S5933Q Compatibility Issue

[Ken Crocker <kcrocker@kcconsulting.com>]

Earlier I wrote:

> I am baffled by a problem that, hopefully, someone in this sig
> has dealt with regarding the AMCC S5933QB Matchmaker PCI I/F chip.
> I have designed a board using the chip and it works great -- as
> long as I don’t want to run anything but the DOS based test program
> that interacts with it. For example, during boot, the network
> protocol stack for my ISA 3Com ethernet board gets loaded, but it
> doesn’t detect any devices attached to the network. And, when I
> try to run Win 3.1, most of the time (see below) the computer
> locks up with the display going to power down mode (ie. the H
> and V syncs go away). 

As a further update to this, I discovered that both Win3.1 and WinNT W/S
4.0 have a 32MByte limit, per PCI board, of memory allocation. This
32MByte limit pertains to the sum of all BAR's. If one goes beyond this,
the OS's will hang before the splash screen without an error message
(thanks Microsoft...). Mapping to I/O space gives my BIOS grief. No such
limitation exists on the Mac.

Thus, all mysteries (at least the ones I was struggling with) seem to be
resolved. Many thanks to all who responded to this thread!


Regards,

Ken Crocker, Principal Engineer
Ken Crocker Consulting
e-mail: kcrocker@kcconsulting.com
(619) 457-0340 Voice, Voicemail, Fax (autoswitch)
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