Re: came makes bus angry
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From: Stefan R. <st...@s5...> - 2011-07-29 13:17:12
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On Jul 29 Clemens Ladisch wrote: > In theory, both should work with > a camera like yours, but it's possible that your VT6308 has smaller > tolerances, that the signal is degraded because of long lines on the > motherboard, or that it's just plain broken. On PC mainboards, the lines between the PHY and the ports may be very long, may contain many turns, may go through vias --- all pitfalls which are to be avoided in 1394 device board layouts. And if there is a breakout cable to a front panel (one without an own dedicated phy), that makes it only worse. > Stefan, might it be a good idea to allow all old IRMs that look like > such a camera, i.e., if they are a S100 device? Good idea.¹ But then we need to address the bug with Sony's bogus IRM in a different way. http://git.kernel.org/linus/10389536742cefbedecb67a5b2906f155cf3a1c3 E.g. do not act as BM if we are not IRM too. I think I have seen another OS doing exactly this. Carl, it would be very useful to know what happens after the modification of CANON_OUI in drivers/firewire/core-card.c as Clemens suggested. ¹) Not trying to become IRM when a 1394-1995-only IRM is detected goes squarely against 1394a-2000 of course. But there is little choice. -- Stefan Richter -=====-==-== -=== ===-= http://arcgraph.de/sr/ |