[CentOS] How do I configure additional serial ports?

Alfred von Campe alfred at 110.net
Fri Mar 9 16:00:58 UTC 2007


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.

Any ideas how to get the 4 ports on the other card working?

Alfred





0a:0a.0 Serial controller: Oxford Semiconductor Ltd OX16PCI954 (Quad  
16950 UART) function 0 (Uart) (prog-if 06 [16950])
         Subsystem: Oxford Semiconductor Ltd: Unknown device 0000
         Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-  
ParErr- Stepping- SERR+ FastB2B-
         Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium  
 >TAbort- <TAbort- <MAbort- >SERR- <PERR-
         Interrupt: pin A routed to IRQ 177
         Region 0: I/O ports at 5020 [size=32]
         Region 1: Memory at d2101000 (32-bit, non-prefetchable)  
[size=4K]
         Region 2: I/O ports at 5000 [size=32]
         Region 3: Memory at d2100000 (32-bit, non-prefetchable)  
[size=4K]
         Capabilities: [40] Power Management version 1
                 Flags: PMEClk- DSI- D1- D2+ AuxCurrent=0mA PME(D0 
+,D1-,D2+,D3hot+,D3cold-)
                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-

0a:0a.1 Bridge: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART)  
function 1 (8bit bus)
         Subsystem: Oxford Semiconductor Ltd: Unknown device 0000
         Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-  
ParErr- Stepping- SERR+ FastB2B-
         Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium  
 >TAbort- <TAbort- <MAbort- >SERR- <PERR-
         Interrupt: pin B routed to IRQ 193
         Region 0: I/O ports at 5060 [size=32]
         Region 1: Memory at d2103000 (32-bit, non-prefetchable)  
[size=4K]
         Region 2: I/O ports at 5040 [size=32]
         Region 3: Memory at d2102000 (32-bit, non-prefetchable)  
[size=4K]
         Capabilities: [40] Power Management version 1
                 Flags: PMEClk- DSI- D1- D2+ AuxCurrent=0mA PME(D0 
+,D1-,D2+,D3hot+,D3cold-)
                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-

0a:0c.0 Serial controller: Oxford Semiconductor Ltd OX16PCI954 (Quad  
16950 UART) function 0 (Uart) (prog-if 06 [16950])
         Subsystem: Oxford Semiconductor Ltd: Unknown device 0000
         Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-  
ParErr- Stepping- SERR+ FastB2B-
         Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium  
 >TAbort- <TAbort- <MAbort- >SERR- <PERR-
         Interrupt: pin A routed to IRQ 217
         Region 0: I/O ports at 50a0 [size=32]
         Region 1: Memory at d2105000 (32-bit, non-prefetchable)  
[size=4K]
         Region 2: I/O ports at 5080 [size=32]
         Region 3: Memory at d2104000 (32-bit, non-prefetchable)  
[size=4K]
         Capabilities: [40] Power Management version 1
                 Flags: PMEClk- DSI- D1- D2+ AuxCurrent=0mA PME(D0 
+,D1-,D2+,D3hot+,D3cold-)
                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-

0a:0c.1 Bridge: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART)  
function 1 (8bit bus)
         Subsystem: Oxford Semiconductor Ltd: Unknown device 0000
         Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-  
ParErr- Stepping- SERR+ FastB2B-
         Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium  
 >TAbort- <TAbort- <MAbort- >SERR- <PERR-
         Interrupt: pin B routed to IRQ 225
         Region 0: I/O ports at 50e0 [size=32]
         Region 1: Memory at d2107000 (32-bit, non-prefetchable)  
[size=4K]
         Region 2: I/O ports at 50c0 [size=32]
         Region 3: Memory at d2106000 (32-bit, non-prefetchable)  
[size=4K]
         Capabilities: [40] Power Management version 1
                 Flags: PMEClk- DSI- D1- D2+ AuxCurrent=0mA PME(D0 
+,D1-,D2+,D3hot+,D3cold-)
                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-




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