[U-Boot] net, cpsw: disable gigabit support through plattform data

[Wolfgang Denk]

Dear Heiko,

In message <1370335914-14027-1-git-send-email-hs at denx.de> you wrote:
> add possibility to disable gigabit support through
> plattform data. Current boards should not be affected
> through this patch.
...
> +		if (phy->speed == 1000) {
> +			if (priv->data.gigabit_en) {
> +				mac_control |= GIGABITEN;
> +			} else {
> +				/* Disable gigabit as it's non-functional */
> +				mac_control &= ~GIGABITEN;
> +				phy->speed = 100;

Is this reliable?  I mean, how do we know it's a 100 Mbps connection
(and not for example a 10 Mbs one) ?

Best regards,

Wolfgang Denk

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