RTOS/TMS320C6657: PDK c665x 2.05: PHY Link detection problem

Peter Demenuk

Part Number: TMS320C6657

Tool/software: TI-RTOS

I have found the bug of PHY Link detection in latest SDK.

On my TMDSEVM6657LS I see periodic phy link up/down effect. Investigation has shown that phy link status checking is incorrect (EMAC driver)..

pdk_c665x_2_0_5\packages\ti\drv\emac\src\v0\mdio.c

line: 421 function: MDIO_timerTick

now:

if( ltmp1 || !(MDIO_REGS->LINK)&(1<<pd->phyAddr) )

should be (it's seems):

if( ltmp1 && !(MDIO_REGS->LINK)&(1<<pd->phyAddr) )

over 6 years ago

0 ToddMullanix over 6 years ago

TI__Guru* 96960 points

I've moved your thread to the device forum.

0 Yordan Kovachev over 6 years ago

TI__Guru**** 161600 points

Hi Peter,

Thanks for sharing your findings. We will look into this.

Best Regards,
Yordan

0 lding over 6 years ago in reply to Yordan Kovachev

TI__Guru* 95265 points

Hi,

"On my TMDSEVM6657LS I see periodic phy link up/down effect. Investigation has shown that phy link status checking is incorrect (EMAC driver).."

One a live 6657EVM connected to a network, I tried to plug and unplug the Ethernet cable to create a link and up event. Then I observed 0X02C08800 region (from UG: www.ti.com/.../spruhh1.pdf):

- offset 0x8 (ALIVE): it is always 0x0100_0000
- offset 0xC (LINK): it is 0x0 when unplugged and 0x0100_0000 when plugged
- offset 0x10 (LINKINTRAW): it is always 0x0

I also set break point at MDIO_timerTick() in assmbly code, it didn't hit. What is your observation for those? Looks the code is not used.

Regards, Eric

0 Peter Demenuk over 6 years ago in reply to lding

Prodigy 160 points

lding,

I have seen LINKINTRAW is not zero. As far as I understand it is OK. After problem fixing (as I described above) ping and UDP transfer have been tested for hours successfully.

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RTOS/TMS320C6657: PDK c665x 2.05: PHY Link detection problem