Files to support litex on Lattice LEF5UM5G-85G board with SDRAM addon and SGMII PHY.

Everything here is experimental.

This repo is structured as below.

.
|
├── linux-on-litex-vexriscv
│   └── ecp5_evn-sdram-sgmii.patch
├── liteeth
│   └── ecp5sgmii.py
└── litex-boards
    └── lattice_ecp5_evn-sdram-sgmii.patch

litex-boards/lattice_ecp5_evn-sdram-sgmii.patch is a patch which adds the supports for SDRAM addon and SGMII PHY to the lattice_ecp5_evn platform.

liteeth/ecp5sgmii.py gives a support for SGMII PHY. Tested on my home-brewed board with TI DP83867S PHY chip. TI offers their full-featured evaluation board DP83867ERGZ-S-EVM for that chip.

ecp5sgmii.py is simply (liteeth pcs_1000basex.py + liteiclink serdes_ecp5.py) reduced and adjusted for "GBE" settings of DCU instead of "10BSER" ones.

linux-on-litex-vexriscv/ecp5_evn-sdram-sgmii.patch is a patch to add this kit as the linux-on-litex-vexriscv target. With this patch, for example,

./make.py --board ecp5_evn --cpu-count 4 --local-ip 10.253.253.95 --remote-ip 10.253.253.8 --build --load

will gives a linux capable RV32 SoC with 4 CPUs.