How to enable PHY

How to enable PHY

[batsayan.das]

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Hi,

I found that ADS8260 board enables PHY by the following lines of code

#ifndef CONFIG_ADS8260
        /* Enable the PHY.
        */
        *(volatile uint *)(BCSR_ADDR + 4) &= ~BCSR1_FETHIEN;
        *(volatile uint *)(BCSR_ADDR + 4) |=  BCSR1_FETH_RST;
#endif


Our board does not have BCSR. My question is how to enable PHY for MPC8260 
based customs board without BCSR? 

Thanks,
Batsayan Das
Tata Consultancy Services Limited
Mailto: batsayan.das@tcs.com
Website: http://www.tcs.com

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Re: How to enable PHY

[Mark Chambers]

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>I found that ADS8260 board enables PHY by the following lines of code 
>
>#ifndef CONFIG_ADS8260 
>        /* Enable the PHY. 
>        */ 
>        *(volatile uint *)(BCSR_ADDR + 4) &= ~BCSR1_FETHIEN; 
>        *(volatile uint *)(BCSR_ADDR + 4) |=  BCSR1_FETH_RST; 
>#endif 
>
>Our board does not have BCSR. My question is how to enable PHY for MPC8260 based customs board without BCSR? 

If your board does not have the BCSR you can just leave this code out.  Usually, you only need to configure which MDII 
interface your PHY is connected to and which IRQ it uses.  But of course I don't know how your PHY is wired up on your
custom board.

Mark Chambers



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Re: How to enable PHY

[Alex Zeffertt]

On Fri, 6 Jan 2006 18:43:08 +0530
batsayan.das@tcs.com wrote:

> 
> Hi,
> 
> I found that ADS8260 board enables PHY by the following lines of
> code
> 
> #ifndef CONFIG_ADS8260
>         /* Enable the PHY.
>         */
>         *(volatile uint *)(BCSR_ADDR + 4) &= ~BCSR1_FETHIEN;
>         *(volatile uint *)(BCSR_ADDR + 4) |=  BCSR1_FETH_RST;
> #endif
> 
> 
> Our board does not have BCSR. My question is how to enable PHY for
> MPC8260 based customs board without BCSR? 

You have to take your PHY out of reset.  How to do this depends on
your board.  On the ADS8260 the PHY reset line goes to the BCSR and
you must write the above to BCSR register 1 to tell it to change the
pin level.

On your board you may need to use GPIO, or you may need to do nothing
at all. Read your schematics!

Regards,

Alex