Date: Wed, 23 Aug 1995 14:38:22 +0200 From: se@zpr.uni-koeln.de (Stefan Esser) To: Jim Lowe <james@miller.cs.uwm.edu> Cc: current@freebsd.org Subject: Re: Matrox Meteor Video Capture Card Driver Message-ID: <199508231238.AA10257@Sysiphos> In-Reply-To: Jim Lowe <james@miller.cs.uwm.edu> "Re: Matrox Meteor Video Capture Card Driver" (Aug 22, 15:03)
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On Aug 22, 15:03, Jim Lowe wrote: } Subject: Re: Matrox Meteor Video Capture Card Driver } I just tried the meteor card in an ASUS triton box with the NCR controller in } it. The machine locked up on large frame transfers. It seemed to work } just fine as long as I kept the PCI data transfer down with small frame } sizes. If I remove the NCR controller and use a different one, the } machine works just fine. Which controller did you use instead ? } For some reason, the NCR seems to lock up when the PCI bus gets real } busy. I am not sure why. Did you try lower values of the "PCI Latency Timer" of the slot the Matrox has been put in ? (This timer determines the number of bus clocks a PCI card may claim ownerchip of the PCI bus, if another card wants to start a transfer. The NCR executes its instruction stream from host RAM, and it may get into trouble if it can only get another instruction every 10us ...) A latency timer setting of some 0x20 for the matrox should allow the NCR to access the bus once per micro second. Guess this is a good value ... (The latency timer doesn't force the PCI device to give up bus ownership if there is no request from another device and thus doesn't slow down the Matrox unless it makes the NCR starve ...) Regards, STefan -- Stefan Esser, Zentrum fuer Paralleles Rechnen Tel: +49 221 4706021 Universitaet zu Koeln, Weyertal 80, 50931 Koeln FAX: +49 221 4705160 ============================================================================== http://www.zpr.uni-koeln.de/staff/esser/esser.html <se@ZPR.Uni-Koeln.DE>
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