[U-Boot-Users] DP83848 PHY for AT91RM9200 board

[Marco Cavallini <arm.linux@koansoftware.com>]

ksi at koi8.net ha scritto:
> On Mon, 1 Oct 2007, Marco Cavallini wrote:
> 
> Here is DP83848 driver code for AT91RM9200 for u-boot-1.1.4 :) Just from my
> archives...
> 
> Something might be missing but the driver source and the header files are
> there...
> 
>> Hi,
>> I'm using u-boot-1.1.4 (quite old but I must use it)
>> with my AT91RM9200 based board.
>> I replaced DM9161 with a new DP83848 PHY ethernet physical layer
>> transceiver.
>>
>> So I'm backporting Sergey Kubushyn's driver
>> National Semiconductor DP83848 PHY Driver for TI DaVinci (TMS320DM644x)
>> adapting it for my AT91RM9200 based board.
>>
>> I left eth_init() like it was for DM9161 because connections are the
>> same.
>> The problem I'm facing to is that PHY is not detected when I call
>> dp83848_is_phy_connected (see below).
>>
>> I wonder if anybody used DP83848 PHY before and maybe could give me a
>> hint.
>>
>> int dp83848_is_phy_connected(AT91PS_EMAC phy_addr)
>> {
>>     u_int16_t    id1, id2;
>>
>>     printf ("*** dp83848_is_phy_connected\n");
>>
>>     at91rm9200_EmacEnableMDIO (phy_addr);
>>     at91rm9200_EmacReadPhy(phy_addr, DP83848_PHYID1_REG, &id1) ;
>>     at91rm9200_EmacReadPhy(phy_addr, DP83848_PHYID2_REG, &id2) ;
>>     at91rm9200_EmacDisableMDIO (phy_addr);
>>
>>     printf ("phy_addr=%X - id1=%X - id2=%X\n", phy_addr, id1, id2);
>>     // here I always get 0xFFFBC000 0xFFFF 0xFFFF
>>
>>     if ((id1 == DP83848_PHYID1_OUI) && (id2 == DP83848_PHYID2_OUI))
>>         return(1);
>>
>>     return(0);
>> }
>>
>> TIA
>> -- 
>> Marco Cavallini



Hi Sergey,
thank you for answering.
we have just discovered an hardware mistake on PFBOUT-PFBIN2 pins
now I can detect the PHY using your code

Thank you very much

Best regards
-- 
Marco Cavallini
Koan s.a.s. - Bergamo - Italia
Embedded and Real-Time Software Engineering
http://www.KoanSoftware.com  -  http://www.KaeilOS.com