# Re: \[PATCH v4\] net: macb: Fix several edge cases in validate

- From: Russell King (Oracle) \<linux@armlinux.org.uk\>
- Date: 2021-10-26 17:46:57 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/10/11214687
- Thread: https://ratatoskr.run/netdev/2021/10/11214465/t.md

```text
On Tue, Oct 26, 2021 at 01:28:15PM -0400, Sean Anderson wrote:
> Actually, according to the Zynq UltraScale+ Devices Register Reference
> [1], the PCS does not support 10/100. So should SGMII even fall through
> here?
> 
> [1] https://www.xilinx.com/html_docs/registers/ug1087/gem___pcs_control.html

Hmm. That brings with it fundamental question: if the PCS supports 1G
only, does it _actually_ support Cisco SGMII, or does it only support
1000base-X?

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```