On Tue, 5 Dec 2006, Jon Senior wrote: > Alan, > > Further to my previous mail, I have located a copy of the VT6212 > datasheet (A lucky hit with Google.). It clearly shows that the EHCI IRQ > Pin register should be a read only value of 0x03 (Line C), while my chip > is reporting 0x01. This could actually be a problem with the cardbus > driver. I have no idea.
Or a hardware bug in the chip. > For now I'll sleep on it, but aside from the > distinct possibility that I'm barking up the wrong tree, I do seem to be > making progress. > > And I tried connecting the external HDD to the old 1.1 ports on the back > of the PC. The transfer rate as reported by hdparm increased! Okay. Good detective work. Maybe you should try posting your results on LKML or a Cardbus/PCMCIA mailing list, to get the right people on board. A bad IRQ assignment might cause the sort of thing you're seeing. The computer wouldn't know that I/O transfers had completed until some other device using the same IRQ raised an interrupt. Although some of the transfers in your log did complete very quickly, so I don't know if this is the whole story. Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
