Enabling a four-port serial card

[Tom Horsley]

On Wed, 19 Dec 2007 17:33:16 -0800 (PST)
David Scriven <davidwriter at yahoo.com> wrote:

> What's left - get a new card??

Did you add the kernel boot parameter in grub.conf? Mine looks like
this:

title Fedora (2.6.23.8-63.fc8)
	root (hd0,2)
	kernel /vmlinuz-2.6.23.8-63.fc8 ro root=LABEL=F8ROOT64 quiet 8250.nr_uarts=9
	initrd /initrd-2.6.23.8-63.fc8.img

The "9" as the value for 8250.nr_uarts tells the kernel to allocate slots
for 9 serial ports in its internal tables. The default is only 4. I use
9 to get the 1 native serial port on my motherboard plus the 8 ports in
my 8 port card to work.

(Of course if you are booting the Xen kernel, completely different trickery
is required).