In case anyone else ends up with this problem, here's how it's resolving... I've been told that this is a result of PCI interface controller on the card (a PLX PCI9050) having trouble with PCI bridges. All of the cards that I have been having trouble with use this interface controller, so that seems to explain my problems. On Wed, 2006-01-04 at 13:18 -0500, Michael R. Head wrote: > Hello, I'm having some trouble with a number of PCI cards and several > PCI bridges. In order to reduce the problem, I'm going to ask about 1 > specific card and one specific bridge. > > The hardware I'm working with is a P4 2.4Ghz machine in a 4U rackmount > chassis. On board are 3 PCI slots connected to the main PCI bus and 9 > PCI slots connected to a bridge to the main PCI bus. > > The software I'm running is an up to date RHEL3 (kernel 2.4.21-37.EL), > but I experience the same problems when I boot off an Ubuntu Breezy > LiveCD (which uses 2.6.12). > > I have an 8 port RS232 card using 16550A UARTs (Sealevel Systems Inc > Eight Port RS-232 Interface). When I plug it into the main PCI bus (#2), > it works perfectly and I get ttyS4-11 working automatically and > properly. > > However, when I put the card in a PCI slot on bus #3 (which is on the > other side of a Pericom Semiconductor PCI to PCI Bridge), I see this > during boot: > > $ dmesg | grep -2 serial > ttyS3 at 0x02e8 (irq = 3) is 16550A > register_serial(): autoconfig failed > Real Time Clock Driver v1.10e > > > When I plug it into a slot on bus #2, I get this from setserial: > $ setserial -g /dev/ttyS4 > /dev/ttyS4, UART: 16550A, Port 0xd200, IRQ: 2 > > When I plut the card into a slot on bus #3, setserial tells me this (by > default); > $ setserial -g /dev/ttyS4 > /dev/ttyS4, UART: unknown, Port: 0xc100, IRQ: 2 > > If I attempt to reconfigure ttyS4 to have the settings from above, I get > the dreaded "ttyS4: LSR safety check engaged!" and from then on, any > access to /dev/ttyS4 results in "/dev/ttyS4: No such device". > > > > Now, I also have some other PCI cards that are having trouble with > living on the other side of a PCI bridge, but their drivers are > available separately from the kernel. I figure that if I can get the > serial card working, then hopefully the rest will work, too. > > I also have an external 4U rackmount chassis containing 12 additional > PCI slots that are connected via 4 Intel 21142 PCI-to-PCI bridges, and > when I connect the serial card into any of those busses, I get the same > problem. > > > I've tried fiddling with all sorts of kernel PCI options at boot and > fiddling with various setpci commands. Nothing seems to help. Any > suggestions or information would be greatly appreciated. > > thanks, > mike > -- Michael R. Head <[email protected]> GPG: http://www.suppressingfire.org/~burner/gpg.key.txt [0x4C9DA1D0]
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