Hello, all my friends,
I am working on porting U-boot to an MPC8541 board. MPC8541 has 2 TSEC and 2 FCC, an issue is that it only has a single SMI master controller. This SMI interface is introduced and illustrated in TSEC chapter of MPC8541 reference manual, while in FCC chapter it is recommended that using GPIO to implement the SMI feature.
In our design, we connect both PHY chips (88E1111s and LXT973) to this single SMI interface, we have discussed and believe that this will work. I know if we use GPIO for FCC to connect with LXT973, I can use bit-bang mii driver(define CONFIG_BITBANGMII), however, I cannot find code in U-boot to implement our current scheme. Mii driver routines in tsec.c seems only designed for TSEC device.
Do I need to write a mii_phy driver for such a scheme?
Thanks for your attention,
Best Regards, Stephen Cheng