From: Sam Song <samsongshu@yahoo.com.cn>
Date: Tue, 6 Mar 2007 21:19:01 +0800 (CST)
Subject: [U-Boot-Users] BITBANGMII implementation for MPC8548 eTSEC &&
	88E1111
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Hi all,

I'd like to implemente BITBANGMII for MPC8548
with a external Marvell 88E1111 PHY as RGMII
interface. The reason was that this board's
MII control lines MDC was broken as HIGH level
always(Sure, it worked right with tsec driver). 
So u-boot reported no PHY found - Bad news:-(

I followed EP8248 BITBANGMII way to use CPLD
to implementate BITBANGMII but couldn't read 
PHY register correctly - PHY ID still unknown.

I wonder whether eTSEC controller can use
BITBANGMII way to work with outside PHY.
Seems that no MII support eTSEC driver
not functional.

<board>.h
#define CONFIG_BITBANGMII

#define MDIO_PORT               0       /* Not used -
implemented in BCSR */
#define MDIO_ACTIVE \
     (*(vu_char *)(CFG_BCSR + 83) |= 0x01)
#define MDIO_TRISTATE \
     (*(vu_char *)(CFG_BCSR + 83) &= 0xFE)
#define MDIO_READ    \
    ((*(vu_char *)(CFG_BCSR + 83) & 1) != 0)

#define MDIO(bit) \
 if(bit) *(vu_char *)(CFG_BCSR + 83) |= 0x01; \
 else    *(vu_char *)(CFG_BCSR + 83) &= 0xFE

#define MDC(bit) \
 if(bit) *(vu_char *)(CFG_BCSR + 83) |= 0x02; \
  else    *(vu_char *)(CFG_BCSR + 83) &= 0xFD
#define MIIDELAY      udelay(1)

drivers/tsec.c
uint read_phy_reg(struct tsec_private *priv, uint
regnum)
 {
        uint value;
        volatile tsec_t *regbase = priv->phyregs;
        uint phyid = priv->phyaddr;

+#ifndef CONFIG_BITBANGMII
        /* Put the address of the phy, and the
register
         * number into MIIMADD */
        regbase->miimadd = (phyid << 8) | regnum;
@@ -281,6 +292,11 @@ uint read_phy_reg(struct
tsec_private *p

        /* Grab the value read from the PHY */
        value = regbase->miimstat;
+#else
     bb_miiphy_read (NULL, phyid, regnum, &value);
+#endif /* CONFIG_BITBANGMII  */

Am I on the right track?

Thanks in advance,

Sam


		
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