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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