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Davinci Emac Driver

Mathew Barrera
Prodigy 10 points

Davinci Emac Generic PHY Driver in ability to create a link or ping in UBOOT, and unable to use the generic PHY driver with the TLK100PHP

I have used the code provided by TI to verify I can make a link with the TLK100PHP, as provided http://www.ti.com/tool/tlk100sample-code

When I attempt to use the generic PHY driver in the kernel the link is dropped and I am unable to communicate.

I have used the XDS510 USB emulator to load the Diagnostic IPNC code as provided by,  http://www.appropho.com/NewWeb/Product_DM368MT5.php#a which has been modified to contain the Ethernet TLK100PHP code to test the PHY I am able to generate a link and configure the PHY using this code as described in the datasheet for the TLK100PHP. As defined here http://www.ti.com/product/tlk100,

I was able to test the TLK100PHP using the code prvided by TI, This has validated the schematic and configuration of the clocks on the DM368, When I attempt use the generic PHY, driver contained in Uboot the link is dropped and I am unable to get traffic external to the TLK, I believe this is a configuration issue within the davinci_emac.c and emac_defs.h files.

 

I am looking for ways to modify the Davinci Emac Driver and the Emac Definitions file to insure I have configured the ethernet PHY correctly any advice this forum can provide will be greatly appreciated. I can provide code and examples of how I have attempted this if this will help you help me.

Thanks

  • 0
    TI__Mastermind 20590 points

    Matthew,  as per the direct feedback but to document on the forum a few things to look at:

     1.       You mention that you were able to test the TLK100PHP using the code attached, do you refer to the EthernetTlk.c of  "ethernetTLK100PHP"?

    2.       Looking at this file ("EthernetTlk.c")  I see that phy_id =1;  which is not necessarily the right phy addr on your board, need to verify that.

    3.       Referring to "EthernetTlk.c" I observe that  the "loopback(phy_id,loopback_mode);" function was enabled, it should be commented (I attached the file with comment on the loopback). Because the loopback  function will not enable you to send /  receive packets from outside the device.

    4.       Referring to "davinci_emac.c", there is a function that detects PHY's addr/id " davinci_eth_phy_detect(void)" it sets  variable " active_phy_addr" to the correct phy address But to the best of my understanding this " active_phy_addr" is not being used by functions: " davinci_eth_phy_read(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t *data)", "davinci_eth_phy_write(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t data)" They use "phy_addr", other functions use the  "active_phy_addr" which is correct?,  am I missing something?

     -- Scott