Alfred von Campe wrote: > I have installed two 4-port serial cards (http://www.startech.com/ > Product/ItemDetail.aspx?productid=PCI4S550&c=US) on a CentOS 4.4 > system. The hardware appears to be recognized correctly, as kudzu > added 2 entries to /etc/sysconfig/hwconf and lscpi shows both cards > (output of lspci -vv for both cards included at the end of this email): > > # lspci > 00:00.0 Host bridge: Intel Corporation 945G/GZ/P/PL Express Memory > Controller Hub (rev 02) > 00:01.0 PCI bridge: Intel Corporation 945G/GZ/P/PL Express PCI Express > Root Port (rev 02) > 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High > Definition Audio Controller (rev 01) > 00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express > Port 1 (rev 01) > 00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express > Port 2 (rev 01) > 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI > #1 (rev 01) > 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI > #2 (rev 01) > 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI > #3 (rev 01) > 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI > #4 (rev 01) > 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 > EHCI Controller (rev 01) > 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1) > 00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC > Interface Bridge (rev 01) > 00:1f.2 IDE interface: Intel Corporation 82801GB/GR/GH (ICH7 Family) > Serial ATA Storage Controller IDE (rev 01) > 00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller > (rev 01) > 01:00.0 VGA compatible controller: nVidia Corporation NV44 [GeForce > 6200 TurboCache(TM)] (rev a1) > 02:00.0 Ethernet controller: Intel Corporation 82573E Gigabit Ethernet > Controller (Copper) (rev 03) > 0a:0a.0 Serial controller: Oxford Semiconductor Ltd OX16PCI954 (Quad > 16950 UART) function 0 (Uart) > 0a:0a.1 Bridge: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART) > function 1 (8bit bus) > 0a:0c.0 Serial controller: Oxford Semiconductor Ltd OX16PCI954 (Quad > 16950 UART) function 0 (Uart) > 0a:0c.1 Bridge: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART) > function 1 (8bit bus) > > However, only the 4 serial ports on one of the two cards are configured > correctly: > > # dmesg | fgrep ttyS > ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A > ttyS4 at I/O 0x5020 (irq = 177) is a 16C950/954 > ttyS5 at I/O 0x5028 (irq = 177) is a 16C950/954 > ttyS6 at I/O 0x5030 (irq = 177) is a 16C950/954 > ttyS7 at I/O 0x5038 (irq = 177) is a 16C950/954 > ttyS1 at I/O 0x5060 (irq = 193) is a 16450 > ttyS2 at I/O 0x5068 (irq = 193) is a 16450 > ttyS3 at I/O 0x5070 (irq = 193) is a 16450 > > I have no idea what ttyS1-3 are, but I've tested ttyS4-7 and they work > fine. If I only install one card (in either PCI slot 1 or 2) I get the > same 4 ports. If I install both cards, ttyS4-7 work on the card that > is in PCI slot 2. Never used these cards, but the standard CentOS4 kernel has the following config settings: CONFIG_SERIAL_8250_NR_UARTS=4 # CONFIG_SERIAL_8250_MANY_PORTS is not set This might be your problem ... James Pearson