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    SubjectRe: ttyS0 not working any more, LSR safety check engaged
    On Sat, 11 Nov 2006 15:30:05 +0000
    Russell King <rmk+lkml@arm.linux.org.uk> wrote:

    > 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.

    /proc/ioports and /proc/iomem might contain hints - can we see those please?
    -
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