Gigabit Adapter limited to 100mbps

Hi Intel,

We did a board that uses SOC(Debian GNU) integrated with the Intel's CT-Desktop adapter(82574l).

It got connected and worked.But we had issues in terms of actual speed when we tried using the PCI card at Gbps.

It automatically switched to 100mbps failing to run at the desired gigabit speed.

Is there any specific drivers to be pre-installed into the chip to work at gbps?

We could share a part of the schematics where 82574l is integrated with SOC.

Thanks in advance.

Regards,

Saravana