From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marco Cavallini <arm.linux@koansoftware.com>
Date: Mon, 01 Oct 2007 14:46:26 +0200
Subject: [U-Boot-Users] DP83848 PHY for AT91RM9200 board
Message-ID: <4700EC22.5020103@koansoftware.com>
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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
Koan s.a.s. - Bergamo - Italia
Embedded and Real-Time Software Engineering
http://www.KoanSoftware.com  -  http://www.KaeilOS.com