mixing uart and sio

[Mike Tancsa]

I am in a rather annoying situation of having one serial application 
not work well with the uart driver (null modem cable connects onboard 
serial ports to a machine I have no control over) and a GPRS device 
where the sio driver causes a constant stream of interrupt overflows


sio4: 109 more interrupt-level buffer overflows (total 109)
sio4: 109 more interrupt-level buffer overflows (total 218)
sio4: 109 more interrupt-level buffer overflows (total 327)
sio4: 109 more interrupt-level buffer overflows (total 436)
sio4: 109 more interrupt-level buffer overflows (total 545)
sio4: 109 more interrupt-level buffer overflows (total 654)
sio4: 109 more interrupt-level buffer overflows (total 763)


dev.sio.4.%desc: Sierra Wireless AC860
dev.sio.4.%driver: sio
dev.sio.4.%location: function=1
dev.sio.4.%pnpinfo: manufacturer=0x0192 product=0x0710 
cisvendor="Sierra Wireless" cisproduct="AC860" function_type=2

Attaching even at 9600 on this card, shows half of the chars are 
missed.  However, with the uart driver, it works.  The one small 
problem is that until I open the device, there is an interrupt storm 
on it.  But after that, it works perfectly.

e.g. attaching with sio shows the output of ati3 cut off

# cu -l /dev/cuad4
Connected
atz
OK
ati3
Manufacturer: Sierra Wireless, Inc.
Model: AC860
Revision: U1_1_29ACAP G:/WORKSPACES/FIRMWARE/U1_1_29ACAP/MSM6275/SRC 
2006/02/20 20:16:52
IMEI: 357806002095833
FSN: X172096078612
3GPP Release 5
+GCAP:atz
OK
ati3
Manufacturer: Sierra Wireless, Inc.
Model: AC860
Revision: U1_1_29ACAP G:/WORKSPACES/FIRMWARE/U1_1_29ACAP/MSM6275/SRC 2006/



vs

# cu -l /dev/cuau0
Connected
atz
OK
ati3
Manufacturer: Sierra Wireless, Inc.
Model: AC860
Revision: U1_1_29ACAP G:/WORKSPACES/FIRMWARE/U1_1_29ACAP/MSM6275/SRC 
2006/02/20 20:16:52
IMEI: 357806002095833
FSN: X172096078612
3GPP Release 5
+GCAP: +CGSM,+FCLASS,+DS







# vmstat -i
interrupt                          total       rate
irq0: clk                         287563        995
irq3: sio1                             1          0
irq4: sio0                           307          1
irq5: vr1                              1          0
irq7:                                  2          0
stray irq7                             2          0
irq8: rtc                          36840        127
irq10: cbb0 sio4                      59          0
irq11: vr0                          3822         13
irq14: ata0                        34495        119
irq15: ata1 ohci0+                     2          0
Total                             363094       1256

# vmstat -i
interrupt                          total       rate
irq0: clk                          89881        987
irq5: vr1                              1          0
irq7:                                  1          0
stray irq7                             1          0
irq8: rtc                          11504        126
irq10: cbb0 uart0                  44275        486
irq11: vr0                           695          7
irq14: ata0                        21145        232
irq15: ata1 ohci0+                     2          0
Total                             167505       1840


cbb0: <PCI-CardBus Bridge> mem 0xa0005000-0xa0005fff irq 10 at device 
14.0 on pci0
cardbus0: <CardBus bus> on cbb0
pccard0: <16-bit PCCard bus> on cbb0
isab0: <PCI-ISA bridge> at device 20.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <AMD CS5536 UDMA100 controller> port 
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xe000-0xe00f at device 20.2 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
ohci0: <OHCI (generic) USB controller> mem 0xa0006000-0xa0006fff irq 
15 at device 21.0 on pci0
ohci0: [GIANT-LOCKED]
usb0: OHCI version 1.0, legacy support
usb0: <OHCI (generic) USB controller> on ohci0
usb0: USB revision 1.0
uhub0: AMD OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 4 ports with 4 removable, self powered
ehci0: <EHCI (generic) USB 2.0 controller> mem 0xa0007000-0xa0007fff 
irq 15 at device 21.1 on pci0
ehci0: [GIANT-LOCKED]
usb1: EHCI version 1.0
usb1: companion controller, 4 ports each: usb0
usb1: <EHCI (generic) USB 2.0 controller> on ehci0
usb1: USB revision 2.0
uhub1: AMD EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub1: 4 ports with 4 removable, self powered
uart1: <16550 or compatible> at port 0x2f8-0x2ff irq 3 on isa0
Timecounter "TSC" frequency 433250425 Hz quality 800
Timecounters tick every 1.000 msec
Fast IPsec: Initialized Security Association Processing.
uart0: <Sierra Wireless AC860> at port 0x3e8-0x3ef irq 10 function 1 
config 34 on pccard0
interrupt storm detected on "irq10:"; throttling interrupt source

         ---Mike



--------------------------------------------------------------------
Mike Tancsa,                                      tel +1 519 651 3400
Sentex Communications,                            mike at sentex.net
Providing Internet since 1994                    www.sentex.net
Cambridge, Ontario Canada                         www.sentex.net/mike