I'm using Stratix 10M board, we are trying to access marvell phy device 88e1111 through i2c. We want 100mbps SGMII with autoneg disabled. This is the sequence that I've tried :
- Write 2100 to reg 0 ( 0010 0001 0000 0000) : Copper full duplex and speed 100mbps, auto neg disabled)
- Write 0400 to reg 9 (0000 0100 0000 0000) : Port type : = Prefer multi-port device (MASTER)
- Write A100 to reg 0 ( 1010 0001 0000 0000) : Softwrae reset
For this sequence we took this as reference and modified it according to our speed and disabled autoneg : https://community.intel.com/t5/FPGA-Wiki/Marvell-88E1111-PHY-Configuration-Steps/ta-p/735410
When I read back i see the speed did not change and remains at 1000mbps.
We have tried writing directly to reg 0 with speed change along with software reset ( A100) , still we see the speed didnot change.
And also no matter what value I write to HW_CFG_MODE it always reads 0001(resrvd value) even after software reset. Are there any 88E1111-specific registers I should configure for SGMII mode?
Any insights or suggestions would be greatly appreciated. Has anyone successfully configured this PHY via I2C for similar requirements?
