The switch has to be configured via its own firmware. The phy_regs
structure is setup with default information to fake a PHY read
operation.


-----Original Message-----
From: Senthil K [mailto:community-noreply@qnx.com] 
Sent: Friday, November 20, 2009 10:23 AM
To: drivers-networking
Subject: MDI Interface and emu phy access

Hi,
In our mpc8548 target board, MPC's MII Bus is connected to a PHY and to
a Switch. 

The current trunk of mpc85xx network driver contains emu_phy, comment
says this emu_phy can be used to configure the switch connected at the
MII BUS

We are not clear on how to use emu_phy/MDI utility (MII Read/Write) to
configure the switch and the PHY 

Kindly help us, give us a pointer

 
Regards
Senthil
 





_______________________________________________

Networking Drivers
http://community.qnx.com/sf/go/post42315

Hi,

we are trying to access the switch via MDI utilities(read/write) functions which has already registered in mpc85xx 
code(mpc85xx_mii_read/write  functions). 

I have attached below sample code, which will access the mpc85xx mdi read/write function. (Registered via 
MDI_Register_Extended  mpc85xx/mii.c).

 Sample Code 
=========
 int mpc85xxphy_attach(struct device *parent, struct device *self, void *aux){


    struct ifnet *ifp = NULL;

    uint16_t  id2,phyid;

    mpc85xx_dev_t   *mpc85xx = NULL;

    int status = 0;

    phyid = 0x00; /* tsec0 = phyid = 0x00 */
 
   /* for getting the mpc85xx device structure */
    ifp = ifunit("tsec0");

    mpc85xx = ifp->if_softc;

   /* Accessing the registered MDI utility read function. */

    id1 = mpc85xx->mdi->Read(mpc85xx, phyid, MDI_PHYID_2);

    printf( "mdi Phy value :[%x]\n",id2);

}

Note :
====
We have an io-pkt entry function which will invoke dev_attach function, in turn invokes our mpc85xxphy_attach function.

While accessing the mpc8xx_mii_read/write function,its getting crashed.

 Error message 
=========
 
# mount -T io-pkt /tmp/devnp-mpc85xx_mii.so

Process 806926 (io-pkt-v4-hc) terminated SIGSEGV code=1 fltno=11 ip=480d1a3c(io-pkt-v4-hc@main+0x7c0) ref=00000000

mount: Can't mount / (type io-pkt)

mount: Possible reason: No such process

#

Can you give suggestions on the following 

1)       Is that any possible to get mpc85xx_dev_t structure other than ifunit function from separate driver. Since we 
are getting crash on accessing mpc85xx mdi structure read/write.

2)       How to access MDI utilities/library (Ex: MDI_FindPhy, MDI_AutoNegotiate) for tsec0 from separate driver. 

3)     emu_phy usage related to switch attached to the MDIO Interface.


Thanks and Regards
K.Senthil.