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eth: Add support for 10GBASE-R to KC705 example design

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
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Alex Forencich
2025-11-09 14:24:05 -08:00
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# Taxi Example Design for KC705
## Introduction
This example design targets the Xilinx KC705 FPGA board.
The design places looped-back MACs on both the BASE-T port and the SFP+ cage, as well as XFCP on the USB UART for monitoring and control.
Note that this design does not support SGMII as the Xilinx SGMII core requires the GTX QPLL, which is already used for 10GBASE-R on the same quad.
* USB UART
* XFCP (921600 baud)
* RJ-45 Ethernet port with Marvell 88E1111 PHY
* Looped-back MAC via GMII
* Looped-back MAC via RGMII
* SFP+ cage
* Looped-back 10GBASE-R MACs via GTX transceiver
## Board details
* FPGA: XC7K325T-2FFG900C
* USB UART: Silicon Labs CP2103
* 1000BASE-T PHY: Marvell 88E1111 via GMII or RGMII
## Licensing
* Toolchain
* Vivado Enterprise (requires license)
* IP
* No licensed vendor IP or 3rd party IP
## How to build
Run `make` in the appropriate `fpga*` subdirectory to build the bitstream. Ensure that the Xilinx Vivado toolchain components are in PATH.
## Board configuration
Several jumpers must be configured to configure the PHY chip for the appropriate mode.
| Mode | J29 | J30 | J64 |
| -------- | ---- | ---- | ---- |
| GMII/MII | 1-2 | 1-2 | open |
| RGMII | 1-2 | open | 1-2 |
Also, note that version 1.0 of the KC705 has the SFP+ TX and RX connections polarity-inverted. Version 1.1 has this fixed. This setting is controlled via a top-level parameter setting that is configurable via config.tcl, so ensure to use a design matching the board revision.
## How to test
Run `make program` to program the board with Vivado.
To test the looped-back MAC, it is recommended to use a network tester like the Viavi T-BERD 5800 that supports basic layer 2 tests with a loopback. Do not connect the looped-back MAC to a network as the reflected packets may cause problems.