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Re: Serial Port Bug?



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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