Serial Port Bug?
Karl Larsen
k5di at zianet.com
Wed Nov 28 21:02:21 UTC 2007
Lamar Owen wrote:
> On Wednesday 28 November 2007, Karl Larsen wrote:
>
>> Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
>>
>> Nothing about being set up in dmesg. It appears the kernel correctly
>> sees the driver. But for some reason it is not turned on.
>>
>
> If the kernel's serial driver sees a serial port enabled it will print three
> lines (not just one) like this:
> Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
> serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
> 00:07: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
>
> On my F8 laptop, which has no serial ports, I still get:
> Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
>
> but no actual ports are found. Just because the kernel loads the serial
> driver doesn't mean it saw a serial port.
>
> So I ask again: is your serial port enabled or disabled in the BIOS? All
> modern BIOS's have the capability to disable the serial ports in hardware to
> where the kernel will not see the ports.
>
> Checking voltages won't help you if the chip interface has been disabled from
> the BIOS setup program.
>
What is the serial port called in the BIOS? I have looked and never
found anything looking like serial port. I will be sure able to do that
IF I know what it is called.
--
Karl F. Larsen, AKA K5DI
Linux User
#450462 http://counter.li.org.
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