U-Boot Port to Yocto - Phy not found

[PaulDeMetrotion]

I am working on a custom u-boot project for Yocto. I pretty much have everything working but cannot get the ethernet to connect. The issue appears to be with the Phy device but once at the command prompt, I can see the KSZ9031 Phy device. I have added a board_phy_config() function in my board file and it is being executed. I am using the same config code that was previously used and verified under LTIB.

Following is the u-boot output with some printf debug lines I added to the phy driver. As can be seen, the Phy is addressable but still isn't seen during the boot.

Any ideas what is wrong?

U-Boot 2014.04 (Sep 17 2015 - 11:37:59)

CPU:   Freescale i.MX6Q rev1.2 at 792 MHz

CPU:   Temperature 37 C, calibration data: 0x5534cc69

Reset cause: POR

Board: SBC35-C398Q

Boot Device: SD

I2C:   ready

DRAM:  2 GiB

MMC:   FSL_SDHC: 0, FSL_SDHC: 1

*** Warning - bad CRC, using default environment

In:    serial

Out:   serial

Err:   serial

mmc1 is current device

Net:   Phy not found

phy_read++  addr = 7  devad = ffffffff  regnum = 0

phy_write++  addr = 7  devad = ffffffff  regnum = 0 val = ffff

phy_read++  addr = 7  devad = ffffffff  regnum = 0

phy_read++  addr = 7  devad = ffffffff  regnum = 9

phy_write++  addr = 7  devad = ffffffff  regnum = 9 val = 1b00

phy_write++  addr = 7  devad = ffffffff  regnum = d val = 2

phy_write++  addr = 7  devad = ffffffff  regnum = e val = 4

phy_write++  addr = 7  devad = ffffffff  regnum = d val = c002

phy_write++  addr = 7  devad = ffffffff  regnum = e val = 0

phy_write++  addr = 7  devad = ffffffff  regnum = d val = 2

phy_write++  addr = 7  devad = ffffffff  regnum = e val = 5

phy_write++  addr = 7  devad = ffffffff  regnum = d val = c002

phy_write++  addr = 7  devad = ffffffff  regnum = e val = 0

phy_write++  addr = 7  devad = ffffffff  regnum = d val = 2

phy_write++  addr = 7  devad = ffffffff  regnum = e val = 6

phy_write++  addr = 7  devad = ffffffff  regnum = d val = c002

phy_write++  addr = 7  devad = ffffffff  regnum = e val = 0

phy_write++  addr = 7  devad = ffffffff  regnum = d val = 2

phy_write++  addr = 7  devad = ffffffff  regnum = e val = 8

phy_write++  addr = 7  devad = ffffffff  regnum = d val = c002

phy_write++  addr = 7  devad = ffffffff  regnum = e val = 3ff

phy_write++  addr = 7  devad = ffffffff  regnum = d val = 2

phy_write++  addr = 7  devad = ffffffff  regnum = e val = 10

phy_write++  addr = 7  devad = ffffffff  regnum = d val = c002

phy_write++  addr = 7  devad = ffffffff  regnum = e val = 4000

phy_read++  addr = 7  devad = ffffffff  regnum = 0

phy_write++  addr = 7  devad = ffffffff  regnum = 0 val = 1340

ksz9031_config()++

phy_read++  addr = 7  devad = ffffffff  regnum = 1

phy_read++  addr = 7  devad = ffffffff  regnum = f

phy_read++  addr = 7  devad = ffffffff  regnum = 4

phy_read++  addr = 7  devad = ffffffff  regnum = 9

phy_read++  addr = 7  devad = ffffffff  regnum = 0

ksz9031_config()--

FEC

Normal Boot

Hit any key to stop autoboot:  0

SBC35-C398Q U-Boot > mii info

PHY 0x07: OUI = 0x0885, Model = 0x22, Rev = 0x01, 100baseT, FDX

SBC35-C398Q U-Boot > mdio read 7 2

7 is not a known ethernet

Reading from bus FEC

PHY at address 7:

2 - 0x22

SBC35-C398Q U-Boot > mdio read 7 3

7 is not a known ethernet

Reading from bus FEC

PHY at address 7:

3 - 0x1621

SBC35-C398Q U-Boot >

[sameerarvikar]

Hi Paul,

as per mii info command my phy id is 0x18 

what paramter should i pass in above function

thanks & regards

[PaulDeMetrotion]

Not much of a response. After more analysis, I found that the 'Phy not found' message is generated in the function get_phy_device_by_mask() which is shown below. Maybe someone has some experience with this code. I cannot determine why the function search_for_existing_phy() does not return a valid value since the Phy device is present and addressable. I have verified that the address is a 7 which is the Phy device address. I cannot find where the array phymap[addr] is being initialized? Am I possibly missing some device initialization function that needs to be done before this code is called? 

static struct phy_device *search_for_existing_phy(struct mii_dev *bus,

                unsigned phy_mask, phy_interface_t interface)

{

        /* If we have one, return the existing device, with new interface */

        while (phy_mask) {

                int addr = ffs(phy_mask) - 1;

                if (bus->phymap[addr]) {

                        bus->phymap[addr]->interface = interface;

                        return bus->phymap[addr];

                }

                phy_mask &= ~(1 << addr);

        }

        return NULL;

}

static struct phy_device *get_phy_device_by_mask(struct mii_dev *bus,

                unsigned phy_mask, phy_interface_t interface)

{

        int i;

        struct phy_device *phydev;

        phydev = search_for_existing_phy(bus, phy_mask, interface);

        if (phydev)

                return phydev;

        /* Try Standard (ie Clause 22) access */

        /* Otherwise we have to try Clause 45 */

        for (i = 0; i < 5; i++) {

                phydev = create_phy_by_mask(bus, phy_mask,

                                i ? i : MDIO_DEVAD_NONE, interface);

                if (IS_ERR(phydev))

                        return NULL;

                if (phydev)

                        return phydev;

        }

        printf("Phy not found\n");

        return phy_device_create(bus, ffs(phy_mask) - 1, 0xffffffff, interface);

}

[kevinchau]

HI, Paul

Did you solve this problem?

[PaulDeMetrotion · Accepted solution]

Yes I did. The following code in my board specific file was not scanning the appropriate phy addr

    /* scan phy 4,5,6,7 */
    phydev = phy_find_by_mask(bus, (0xf << 4), PHY_INTERFACE_MODE_RGMII);

The second variable passed to the function phy_find_by_mask() needed to include address 7 which is the MSB of the mask. If you want to scan all addresses from 0-7, then pass 0xff as the parameter.

[liu_jialu]

imx6q with PHY chip AR8035, u-boot of L4.1.15-2.0.0 display error:

                   Net:   Board Net Initialization Failed

according to the method, it works well now, thanks so much.

[igorpadykov]

HI Paul

I believe it may be useful to look at micrel drivers at

Micrel KSZ8091 drivers for i.MX6 platform. Any leads appreciated.

[PATCH 3/3] ARM: i.MX6: add ethernet phy fixup for KSZ9031

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

[PaulDeMetrotion]

These patches are for Linux drivers. I am having issues with u-boot access to the PHY.