Hi,

This patch adds Netgear GA621 support to the ns83820 driver
by adding code to configure the optical transceiver on
these boards. People currently using Netgear driver (gam)
may like to test this.

I decided to add support for GA621 to the ns83820 driver after
suffering an oops with the netgear supplied driver whose code
is rather convoluted on not very Linux like (appears to be a
port of a NDIS driver) ie. it won't probably ever make it into
the kernel without a lot of rework.

It would be good if someone could test this on copper
cards to make sure it still works okay.

~mc