Messages in this thread | | | Date | Sat, 11 Nov 2006 15:30:05 +0000 | From | Russell King <> | Subject | Re: ttyS0 not working any more, LSR safety check engaged |
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On Sat, Nov 11, 2006 at 01:34:55PM +0100, Marc Haber wrote: > On Sat, Nov 11, 2006 at 11:50:16AM +0000, Russell King wrote: > > Maybe something to do with PNP? Maybe ACPI? Both of those I know > > nothing about, but I suggest that if you have PNP enabled, you > > build and use the 8250_pnp module, even if your port is detected > > by the legacy detection methods in 8250. > > How do I configure that? > > I have: > ? ?<*> 8250/16550 and compatible serial support ? ? > ? ?[*] Console on 8250/16550 and compatible serial port ? ? > ? ?<*> 8250/16550 PCI device support ? ? > ? ?<*> 8250/16550 PNP device support ? ?
That's fine.
> $ grep -i 'nov 11.*\(8250\|serial\|ttyS\|pnp\)' /var/log/syslog/syslog > pnp: PnP ACPI init > pnp: PnP ACPI: found 15 devices > PnPBIOS: Disabled by ACPI PNP > pnp: 00:0d: ioport range 0x4d0-0x4d1 has been reserved > pnp: 00:0d: ioport range 0x1000-0x107f could not be reserved > pnp: 00:0d: ioport range 0x1100-0x113f has been reserved > pnp: 00:0d: ioport range 0x1200-0x121f has been reserved > isapnp: Scanning for PnP cards... > isapnp: No Plug & Play device found > Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled > serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ttyS0 detected via legacy ISA probes.
> serial8250: ttyS2 at I/O 0x3e8 (irq = 4) is a 16550A
ttyS2 detected via legacy ISA probes.
> 00:02: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ttyS0 detected via PNP device 00:02.
> ttyS0: LSR safety check engaged! > ttyS2: LSR safety check engaged!
and then it mysteriously disappears on us.
It's certainly a mystery. Suggest you git bisect to find the offending change - I doubt it'll be serial/8250 itself.
-- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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