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Date: Fri, 07 Mar 2008 13:48:23 +0100
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-help] IRQ problem
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To: Salvatore De Astis <dev.rinux@domain.hid>
Cc: xenomai@xenomai.org

Salvatore De Astis wrote:
> Hi,
> I've two PCI Exar Octal Uart XR17D158. To set up the boards I change the
> MAX_DEVICES  from 8  to 16 in 16550A.c.
> At strartup I this messages:
> 
> ACPI: PCI interrupt for device 0000:02:07.0 disabled
> ACPI: PCI interrupt for device 0000:02:05.0 disabled
> ACPI: PCI Interrupt 0000:02:05.0[A] -> Link [LNKB] -> GSI 9 (level, low) ->
> IRQ 9
> 0000:02:05.0: ttyS4 at MMIO 0xdfcff000 (irq = 9) is a 16550A
> 0000:02:05.0: ttyS5 at MMIO 0xdfcff200 (irq = 9) is a 16550A
> 0000:02:05.0: ttyS6 at MMIO 0xdfcff400 (irq = 9) is a 16550A
> 0000:02:05.0: ttyS7 at MMIO 0xdfcff600 (irq = 9) is a 16550A
> 0000:02:05.0: ttyS8 at MMIO 0xdfcff800 (irq = 9) is a 16550A
> 0000:02:05.0: ttyS9 at MMIO 0xdfcffa00 (irq = 9) is a 16550A
> 0000:02:05.0: ttyS10 at MMIO 0xdfcffc00 (irq = 9) is a 16550A
> 0000:02:05.0: ttyS11 at MMIO 0xdfcffe00 (irq = 9) is a 16550A
> ACPI: PCI Interrupt 0000:02:07.0[A] -> Link [LNKD] -> GSI 11 (level, low) ->
> IRQ 11
> 0000:02:07.0: ttyS12 at MMIO 0xdfcfe000 (irq = 11) is a 16550A
> 0000:02:07.0: ttyS13 at MMIO 0xdfcfe200 (irq = 11) is a 16550A
> 0000:02:07.0: ttyS14 at MMIO 0xdfcfe400 (irq = 11) is a 16550A
> 0000:02:07.0: ttyS15 at MMIO 0xdfcfe600 (irq = 11) is a 16550A
> 0000:02:07.0: ttyS16 at MMIO 0xdfcfe800 (irq = 11) is a 16550A
> 0000:02:07.0: ttyS17 at MMIO 0xdfcfea00 (irq = 11) is a 16550A
> 0000:02:07.0: ttyS18 at MMIO 0xdfcfec00 (irq = 11) is a 16550A
> 0000:02:07.0: ttyS19 at MMIO 0xdfcfee00 (irq = 11) is a 16550A
> 
> So I load xeno_16650A in this way:
> modprobe xeno_16550A
> mem=0xdfcff000,0xdfcff200,0xdfcff400,0xdfcff600,0xdfcff800,0xdfcffa00,0xdfcffc00,0xdfcffe00,0xdfcfe000,0xdfcfe200,0xdfcfe400,0xdfcfe600,0xdfcfe800,0xdfcfea00,0xdfcfec00,0xdfcfee00
> irq=9,9,9,9,9,9,9,9,11,11,11,11,11,11,11,11

Oh, nice... Be warned about the I/O load (specifically IRQ load) this
may cause if you are really planning to use 16 channels in parallel,
maybe even at 115k2.

> 
> On the first bord I can read and write data. On the second I start to write
> but as I try to move the usb mouse I have this:
> 
> Xenomai: xnintr_edge_shirq_handler: IRQ11 not handled. Disabling IRQ line.
> 
> What's the problem?

IRQ 11 shared between USB host controller and the second Exar? Check
/proc/interrupts, see Wiki for generic recommendations.

Jan

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