On 24/06/2024 17:45, Andrew Lunn wrote:
https://mirror2.openwrt.org/docs/MT7981B_Wi-Fi6_Platform_Datasheet_Open_V1.0.pdf
page 107 (text for 9.1.1 is relevant but not a complete match). In the
EN7581 case there is a 5 port switch in the place of GMAC1 (one switch port
is connected to GDM1).
The typical DSA architecture is that the SoC MAC is connected to a
switch MAC port. You say here, the switch is directly connected to the
GGM1. So there is no GMAC involved? If there is no MAC, you don't need
a MAC driver.
It seems more likely there is a GMAC, and the SGMII interface, or
something similar is connected to the switch?
Andrew
Hi, the Mediatek MT7988A SoC block diagram is similar to the EN7581 as
it also have a built in switch (MT7531). MT7988A manual can be found here:
wiki.banana-pi.org/Banana_Pi_BPI-R4
drive.google.com/drive/folders/1XiVchy0a4syYFVlTndhVCETNJ9x7KOYi
MT7988A_Wi-Fi7_Platform_Datasheet_Open_V0.1.pdf
with page 125 containing the block diagram.
Per my understanding the MT7530 switch port connecting to the SoC in the
EN7581 has a direct connection to the GDM1 port. There seem to not be
any SGMII and MAC in this data path. How it actually is connected
internally is unknown to me but packets seem to transfer automatically
between the GDM1 port and the MT7530 switch soc port.
And as mentioned before there are high speed MACs capable of
HSGMII/USXGMII connected to the other GDM ports.
So there will be MACs involved just not for the connection to the MT7530
switch.
MvH
Benjamin Larsson
