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
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