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Using RTL8211 ethernet phy

Wonhong Kwon
Intellectual 260 points


Hi All,

I've been struggling with TI8168 + RTL8211 ethernet phy on our custom board. On u-boot, I can ping to the host but ethernet connection is very unstable when I try to get some binaries from the host via tftp. Using wireshark (packet capturing application) on host side, I can see that the host keeps waiting the ACK packet from the board sometimes. However, when I put some debug logs on u-boot, I also can see that TI8168 emac sends the ACK already.

Have you anyone tried to use ethernet phy different from the evm ? 
Any ideas to debug this issue will be very helpful to me.

Thanks,
Wonhong

  • 0
    TI__Expert 8250 points

    Wonhong

    Just to isolate if its related to auto-negotiation, can you force the Host to 10Mbps/Half-duplex and repeat the same experiment(if possible have the board directly connected to the board)

    Regards

    Sriram

  • 0 in reply to Srirama Govindarajan
    Intellectual 260 points

    Hi Sriram,

    When I forced the board to 10Mbps by setting PHY configuration and without using auto-negotiation (no changes on the host), I could see the reliable connection between the host and the board.

    Regards,
    Wonhong

  • 0 in reply to Wonhong Kwon
    TI__Expert 8250 points

    Hi

    Typically the PHY will  have bootstrap settings for enabling 10/100/1000Mbps and autonegotiation (input lines to the PHY that are latched at PHY reset). Please review the schematics to ensure that you have proper pull-ups/pull-downs on these lines to enable the right settings.

    Other option would be to re-initialize the settings in SW and force re-negotiation after programming the PHY registers in SW

    Regards

    sriram

  • 0 in reply to Srirama Govindarajan
    Intellectual 260 points

    Hi Sriram,

    There was some issues on our custom board (the bootstrap options were correct but some pin assignment for PHY device were not) and after the fix I can see that receive and transmit operation on the ethernet is very stable in both 10 and 100 Mbps mode. (I enabled the auto-negotiation feature again.)

    So, I've tried to make a connection in 1000 Mbps (Gigabit) mode but I've got some other issue.
    As far as I understand, in 1000 Mbps mode, EMAC should output the EMAC_GMTCLK with 125 MHz frequency for transmit operation and PHY should generate the EMAC_RXCLK with 125 MHz for receive operation. I confirmed that PHY generated 125 MHz EMAC_RXCLK with the O'scope, but EMAC didn't generated anything at all. That is, there was no signal on EMAC_GMTCLK in 1000 Mbps mode. (FYI, in 100 Mbps mode, EMAC generated 25 MHz EMAC_GMTCLK.)

    To set EMAC to Gigabit mode, I set GIGFORCE (MACCONTROL[17]) and GIG (MACCONTROL[7]) to 1. Do I need to set more register to enable Gigabit feature on EMAC ?

    Regards,
    Wonhong

  • 0 in reply to Wonhong Kwon
    Prodigy 110 points

    hi all:

      i use dm8148 +rtl8211E-VB  on uboot  use ping have a error message :

      TI8148_IPNC#ping 192.168.1.1

      link up on port 0, speed 100, full duplex

      Using cpsw device

     ping failed; host 192.168.1.1 is not alive

     phy is alive

    EMAC -CPSW_3G register P0_BLK_CNT have no ack  (value: 0x41)

    i have a questions how verification EMAC  and MDIO  ...data tx/rx is normal,

     

  • 0 in reply to jing sun1
    Prodigy 110 points

    test way: 

       1) phy lookback :  clk ,tx/rx is ok   phy  working ok 

       2) wireshark capture arp request and replay packet ok , no found icmp packet

            EMAC -CPSW_3G register P0_BLK_CNT  value no change

       3) found two phyaddr 0x00, 0x01 (why ?)

        PHY 0x00: OUI = 0x0732, Model = 0x11, Rev = 0x05, 100baseT, FDX
        PHY 0x01: OUI = 0x0732, Model = 0x11, Rev = 0x05, 100baseT, FDX

       Where there are problems？