On Fri, 2006-08-18 at 18:04 +0100, Russell King wrote:
> On Fri, Aug 18, 2006 at 01:00:00PM -0400, Lee Revell wrote:
> > On Fri, 2006-08-18 at 10:48 +0200, Giampaolo Tomassoni wrote:
> > > > On Thu, 2006-08-17 at 00:19 +0100, Russell King wrote:
> > > >
> > > >
> > > > OK, thanks. FWIW here is the serial board we are using:
> > > >
> > > > http://www.moschip.com/html/MCS9845.html
> > > >
> > > > The hardware guy says "The mn9845cv, have in default 2 serial ports and
> > > > one ISA bus, where we have connected the tl16c554, quad serial port."
> > > >
> > > > Hopefully Ingo's latency tracer can tell me what is holding off
> > > > interrupts.
> > >
> > > I beg your pardon: I'm not used that much to interrupts handling in Linux, but this piece of code from sound/drivers/serial-u16550.c in a linux-2.6.16:
> >
> > OK, they are not using serial-u16550 but 8250_fourport for some reason:
>
> Doesn't look like it. fourport cards have their ports at 0x1a0..0x1bf
> and 0x2a0..0x2bf, and have some special and non-standard features.
>
Which driver is being used then?
# cat /proc/interrupts
CPU0
0: 801050 IO-APIC-edge timer
1: 42 IO-APIC-edge i8042
7: 0 IO-APIC-edge parport0
8: 4 IO-APIC-edge rtc
9: 0 IO-APIC-level acpi
12: 11022 IO-APIC-edge i8042
14: 2517 IO-APIC-edge ide0
169: 536096 IO-APIC-level ohci1394, ICE1712
185: 3908 IO-APIC-level eth0, serial
193: 8610 IO-APIC-level libata
201: 326 IO-APIC-level uhci_hcd:usb1, uhci_hcd:usb2,
uhci_hcd:usb3, uhci_hcd:usb4, ehci_hcd:usb5
217: 84947 IO-APIC-level nvidia
NMI: 0
LOC: 800973
ERR: 0
MIS: 0
# lsmod | egrep serial\|8250
8250_fourport 2048 0 [permanent]
8250_pnp 8704 0
parport_serial 7680 0
parport_pc 31984 1 parport_serial
8250_pci 19968 1 parport_serial
8250 22704 12 8250_pnp,8250_pci
serial_core 19200 1 8250
Serial: 8250/16550 driver $Revision: 1.90 $ 10 ports, IRQ sharing
enabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
pci_hotplug: PCI Hot Plug PCI Core version: 0.5
shpchp: Standard Hot Plug PCI Controller Driver version: 0.4
Linux agpgart interface v0.101 (c) Dave Jones
agpgart: Detected AGP bridge 0
agpgart: AGP aperture is 128M @ 0xe8000000
parport: PnPBIOS parport detected.
parport0: PC-style at 0x378, irq 7 [PCSPP,TRISTATE]
Real Time Clock Driver v1.12ac
input: PC Speaker as /class/input/input1
ACPI: PCI Interrupt 0000:00:0b.0[A] -> GSI 19 (level, low) -> IRQ 185
0000:00:0b.0: ttyS4 at I/O 0xdd00 (irq = 185) is a 16550A
0000:00:0b.0: ttyS5 at I/O 0xe300 (irq = 185) is a 16550A
0000:00:0b.0: ttyS6 at I/O 0xe400 (irq = 185) is a 16550A
0000:00:0b.0: ttyS7 at I/O 0xd000 (irq = 185) is a 16550A
0000:00:0b.0: ttyS8 at I/O 0xd100 (irq = 185) is a 16550A
0000:00:0b.0: ttyS9 at I/O 0xd200 (irq = 185) is a 16550A
Lee
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
