Linux version 2.6.18_pro500-davinci_evm-arm_v5t_le-gb43d9841-dirty (kirill@kirill) (gcc version 4.2.0 (MontaVista 4.2.0-16.0.32.0801914 2008-08-30)) #1 PREEMPT Mon Nov 29 12:55:40 MSK 2010
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
Machine: DaVinci DM365 EVM
...............................................
Kernel command line: console=ttyS0,115200n8 noinitrd rw eth=00:01:02:03:04:05 ip=192.168.10.254:192.168.10.3:::arm:eth0:off root=/dev/nfs nfsroot=192.168.10.3:/home/kirill/nfs/rootfs,nolock
TI DaVinci EMAC: kernel boot params Ethernet address: 00:01:02:03:04:05
....................................................
Generic PHY: Registered new driver
......................................................
RTL8201PHY: Starting realtek_init.
Realtel RTL8201: Registered new driver
Davinci EMAC MII Bus: probed
i2c_davinci i2c_davinci.1: timeout waiting for bus ready
i2c_davinci i2c_davinci.1: timeout waiting for bus ready
i2c_davinci i2c_davinci.1: timeout waiting for bus ready
i2c_davinci i2c_davinci.1: timeout waiting for bus ready
MAC address is 02:00:10:00:00:00
TI DaVinci EMAC Linux version updated 4.0
...............................................
IPv4 over IPv4 tunneling driver
TCP bic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
...........................................
RTL8201PHY: Starting rtl8201_config_init.
found Realtek RTL8201 PHY
IP-Config: Guessing netmask 255.255.255.0
IP-Config: Complete:
      device=eth0, addr=192.168.10.254, mask=255.255.255.0, gw=255.255.255.255,
     host=arm, domain=, nis-domain=(none),
     bootserver=192.168.10.3, rootserver=192.168.10.3, rootpath=
Looking up port of RPC 100003/2 on 192.168.10.3
portmap: server 192.168.10.3 not responding, timed out
Root-NFS: Unable to get nfsd port number from server, using default
Looking up port of RPC 100005/1 on 192.168.10.3
portmap: server 192.168.10.3 not responding, timed out
Root-NFS: Unable to get mountd port number from server, using default
mount: server 192.168.10.3 not responding, timed out
Root-NFS: Server returned error -5 while mounting /home/kirill/nfs/rootfs
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

$ ps aux | grep nfs | grep -v grep
root      1106  0.0  0.0      0     0 ?        S    Nov29   0:00 [nfsiod]
root      1387  0.0  0.0      0     0 ?        S    Nov29   0:00 [nfsd4]
root      1388  0.0  0.0      0     0 ?        S    Nov29   0:00 [nfsd]
root      1389  0.0  0.0      0     0 ?        S    Nov29   0:00 [nfsd]
root      1390  0.0  0.0      0     0 ?        S    Nov29   0:00 [nfsd]
root      1391  0.0  0.0      0     0 ?        S    Nov29   0:00 [nfsd]
root      1392  0.0  0.0      0     0 ?        S    Nov29   0:00 [nfsd]
root      1393  0.0  0.0      0     0 ?        S    Nov29   0:00 [nfsd]
root      1394  0.0  0.0      0     0 ?        S    Nov29   0:00 [nfsd]
root      1395  0.0  0.0      0     0 ?        S    Nov29   0:00 [nfsd]

$ ps aux | grep portmap | grep -v grep
daemon    1076  0.0  0.0   1796   444 ?        Ss   Nov29   0:00 /sbin/portmap

$ ls drivers/net/phy | grep c
broadcom.c
cicada.c
davicom.c
fixed.c
icplus.c
Kconfig
lxt.c
marvell.c
mdio_bus.c
phy.c
phy_device.c
phy_device.o
qsemi.c
realtek.c
smsc.c
vitesse.c

#include <linux/module.h>
#include <linux/phy.h>

char debug = 1;
#define DBG(format, args...) if (debug) printk("RTL8201PHY: " format "\n", ##args)

static int rtl8201_config_init(struct phy_device *phydev)
{
    DBG("Starting %s.", __func__);
    phydev->irq = PHY_POLL;
    //phydev->interrupts = PHY_INTERRUPT_DISABLED;

    return 0;
}

static int rtl8201_ack_interrupt(struct phy_device *phydev)
{
    DBG("Starting %s.", __func__);
    return 0;
}

static int rtl8201_config_interrupt(struct phy_device *phydev)
{
    DBG("Starting %s.", __func__);
    return 0;
}
static struct phy_driver rtl8201_driver = {
    .phy_id = 0x8201,
    .phy_id_mask = 0xffff,
    .name = "Realtel RTL8201",
    .features = (SUPPORTED_10baseT_Half | \
                 SUPPORTED_10baseT_Full | \
                 SUPPORTED_100baseT_Half | \
                 SUPPORTED_100baseT_Full | \
                 SUPPORTED_Autoneg | \
                 SUPPORTED_MII),
    .flags = 0,
    .config_init = rtl8201_config_init,
    .config_aneg = genphy_config_aneg,
    .read_status = genphy_read_status,
    .ack_interrupt = rtl8201_ack_interrupt,
    .config_intr = rtl8201_config_interrupt,
    .driver = {.owner = THIS_MODULE},
};

static int __init realtek_init(void)
{
    int ret;
    
    DBG("Starting %s.", __func__);
    ret = phy_driver_register(&rtl8201_driver);
    if (ret) {
        printk("Can't registered driver for Realtek RTL8201.\n");
        phy_driver_unregister(&rtl8201_driver);
    }

    return ret;
}

static void __exit realtek_exit(void)
{
    DBG("Starting %s.", __func__);
    phy_driver_unregister(&rtl8201_driver);
}

module_init(realtek_init);
module_exit(realtek_exit);

#define PHY_ID_MASK        0xfffffff0
#define LXT971_ID        0x001378e0
#define KSZ8893MQL_ID    0x00221430
#define RTL8201_ID      0x8201

static int emac_phy_init(struct emac_dev *dev, u8 phy_num, u8 *phy_cnt,
             u8 *phy_max)
{
    char phy_id[BUS_ID_SIZE];

    snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT, 1, phy_num);

    dev->phydev[phy_num] = phy_connect(dev->owner, phy_id,
        &emac_update_phy_status, 0, PHY_INTERFACE_MODE_MII);
    if (IS_ERR(dev->phydev[phy_num])) {
        if (dev->phydev[phy_num] == ERR_PTR(-ENODEV))
            dev->phydev[phy_num] = NULL;
        return PTR_ERR(dev->phydev[phy_num]);
    }

    dev->phydev[phy_num]->supported = PHY_BASIC_FEATURES;

    if (dev->init_cfg.gigabit)
        dev->phydev[phy_num]->supported |= SUPPORTED_1000baseT_Full;

    dev->phydev[phy_num]->advertising = dev->phydev[phy_num]->supported;

    if ((dev->phydev[phy_num]->phy_id & PHY_ID_MASK) == LXT971_ID) {
        /*
         * CRITICAL: Fix for increasing PHY signal drive strength for
         * TX lockup issue. On DaVinci EVM, the Intel LXT971 PHY
         * signal strength was low causing TX to fail randomly. The
         * fix is to Set bit 11 (Increased MII drive strength) of PHY
         * register 26 (Digital Config register) on this phy.
         */
        int control;

        pr_info("applying Intel LTX971 workaround..\n");

        control = phy_read(dev->phydev[phy_num], 26);
        phy_write(dev->phydev[phy_num], 26, (control | 0x800));
        phy_read(dev->phydev[phy_num], 26);
    } else if ((dev->phydev[phy_num]->phy_id & PHY_ID_MASK) ==
            KSZ8893MQL_ID) {
        /*
         * KSZ8893MQL is a layer 2 switch that connects to EMAC via
         * MII.  The MII setting is required to be fixed with autoneg
         * off, 100Mbps, and full duplex.  This happens to be the
         * settings and behavior when phy_mode is set to SNWAY_NOPHY.
         * Therefore, we set the phy_mode to SNWAY_NOPHY whenever
         * KSZ8893MQL is detected.
         */
        dev->init_cfg.phy_mode = SNWAY_NOPHY;

        /* The third phy is used for MII, so only expect 2 phys */
        *phy_max = 2;
    } else if ((dev->phydev[phy_num]->phy_id & 0xffff) == RTL8201_ID) {
        pr_info("found Realtek RTL8201 PHY\n");
        //dev->init_cfg.phy_mode = SNWAY_NOPHY;
    }

    *phy_cnt = *phy_cnt + 1;
    phy_start(dev->phydev[phy_num]);

    return 0;
}