Hi, > > Do you know the story behind this Ethernet controller? > > I just happened to get a board based on the S500 SoC, so I took this > opportunity to help improving the mainline kernel support, but other > than that I do not really know much about the hardware history. > > > The various > > receive/transmit descriptor definitions are 99% those defined in > > drivers/net/ethernet/stmmicro/stmmac/descs.h for the normal descriptor. > > That's an interesting observation. I could only assume the vendor did > not want to reinvent the wheel here, but I cannot say if this is a > common design scheme or is something specific to STMicroelectronics > only. I am not entirely sure about it but it looks like it *may* only need to have a glue driver to connect to DWMAC. For instance, on the U-boot[1] side (S700 is one of 64bit OWL SoC from actions), we kind of re-uses already existing DWMAC and provide a glue code, and on the Linux side as well have some similar implementation (locally). Thanks -Amit. [1]: https://source.denx.de/u-boot/u-boot/-/blob/master/drivers/net/dwmac_s700.c
