Changes required for converting from RMII to MII

[Mohsin455]

Hi All,

              I am using TWRK60N512 and MQX 3.8. I am using KSZ8895MQ with MII Interface on my custom board. I know there are issues, such that TWRK60N512 cannot be used in MII mode (as some of the pins are use for JTAG)  but I will be trying this on custom board.

I want to know what are the changes required in the MQX code for TWRK60N512 in order to convert from RMII to MII Interface. Do we only require seting the required pins within init_gpio.c and selecting ENET_OPTION_MII option or are there any other modifications needed ?

Thanks,

Mohsin

[Mohsin455]

Hi All,

Can anyone please provide the steps required to change from RMII to MII?

Thanks,

Mohsin

[Jeinstei]

https://community.freescale.com/thread/102212

This thread covers some of the difficulties in detail. I hope it helps. In short, it sounds like it is not possible using the TWR peripherals unless I'm missing something.

[Mohsin455]

Hi,

        I know the issues when using MII with TWRK60N512. I just wanted to know what steps are required in order to use it on my custom board.

I have made the following changes.

1) Added the port initialisation in init_gpio.c file.

2) Changes ENET_OPTION_RMII to ENET_OPTION_MII in ENET_default_params initialisation.

3) Changed the MII register defines as the were a bit different but still using similar function as in phy_ksz8041.c

Are there any other changes required ?

thanks,

Mohsin

[uabc_mac]

We are using TWRK60F and MQX 4.0 besides KSZ8041NL with RMII Interface on my custom board. I discovered a problem because RMII_MDC does not show any signal.

I am using original driver, I saw a detail about your problem, interesting for me, maybe your answer could helpme to resolve my problem.

what do you do here?

1) Added the port initialisation in init_gpio.c file.

Aditional question: Do you have idea about what is the source of RMII_MDC?

Thanks a lot in advance for your help

[monXii]

No, these steps should work !

Maybe some hardware problems? My problem was i connected the MII0_RXER pin to the PHY ..

Disconnected this pin .. its not requiered .. and all was fine!

Just edit the init_gpio.c ..

should look like this:

#if 0 // tower ..    pctl->PCR[12] = 0x00000400;     /* PTA12, RMII0_RXD1/MII0_RXD1      */    pctl->PCR[13] = 0x00000400;     /* PTA13, RMII0_RXD0/MII0_RXD0      */    pctl->PCR[14] = 0x00000400;     /* PTA14, RMII0_CRS_DV/MII0_RXDV    */    pctl->PCR[15] = 0x00000400;     /* PTA15, RMII0_TXEN/MII0_TXEN      */    pctl->PCR[16] = 0x00000400;     /* PTA16, RMII0_TXD0/MII0_TXD0      */    pctl->PCR[17] = 0x00000400;     /* PTA17, RMII0_TXD1/MII0_TXD1      */#else    pctl->PCR[14] = PORT_PCR_MUX(4);//RMII0_CRS_DV/MII0_RXDV    // disconnect this pin if you have connected it to the PHY .. !    //pctl->PCR[5]  = PORT_PCR_MUX(4);//RMII0_RXER/MII0_RXER    pctl->PCR[12] = PORT_PCR_MUX(4);//RMII0_RXD1/MII0_RXD1    pctl->PCR[13] = PORT_PCR_MUX(4);//RMII0_RXD0/MII0_RXD0    pctl->PCR[15] = PORT_PCR_MUX(4);//RMII0_TXEN/MII0_TXEN    pctl->PCR[16] = PORT_PCR_MUX(4);//RMII0_TXD0/MII0_TXD0    pctl->PCR[17] = PORT_PCR_MUX(4);//RMII0_TXD1/MII0_TXD1    pctl->PCR[11] = PORT_PCR_MUX(4);//MII0_RXCLK    pctl->PCR[25] = PORT_PCR_MUX(4);//MII0_TXCLK    pctl->PCR[9]  = PORT_PCR_MUX(4);//MII0_RXD3    pctl->PCR[10] = PORT_PCR_MUX(4);//MII0_RXD2        pctl->PCR[28] = PORT_PCR_MUX(4);//MII0_TXER    pctl->PCR[24] = PORT_PCR_MUX(4);//MII0_TXD2    pctl->PCR[26] = PORT_PCR_MUX(4);//MII0_TXD3    pctl->PCR[27] = PORT_PCR_MUX(4);//MII0_CRS    pctl->PCR[29] = PORT_PCR_MUX(4);//MII0_COL#endif    pctl = (PORT_MemMapPtr)PORTB_BASE_PTR;    pctl->PCR[0] = PORT_PCR_MUX(4) | PORT_PCR_ODE_MASK; /* PTB0, RMII0_MDIO/MII0_MDIO   */    pctl->PCR[1] = PORT_PCR_MUX(4);                     /* PTB1, RMII0_MDC/MII0_MDC     */

And edit the init_enet.c

shoud look like this:

const ENET_PARAM_STRUCT ENET_default_params[BSP_ENET_DEVICE_COUNT] = {    {        &ENET_0,        Auto_Negotiate,#if 0 // tower ..        ENET_OPTION_RMII |#endif        ENET_OPTION_PTP_MASTER_CLK,        BSPCFG_TX_RING_LEN,   // # tx ring entries        BSPCFG_TX_RING_LEN,   // # large tx packets        ENET_FRAMESIZE,       // tx packet size             BSPCFG_RX_RING_LEN,   // # rx ring entries        BSPCFG_RX_RING_LEN,   // # normal rx packets - must be >= rx ring entries        ENET_FRAMESIZE,       // ENET_FRAMESIZE,   // rx packet size        BSPCFG_RX_RING_LEN,   // # rx PCBs - should be >= large rx packets.             0,             0         },};

that's all for me