topic Re: Ethernet receiving with M4 core in i.MX Processors

Ethernet receiving with M4 core

xingshengwan — Wed, 18 Sep 2019 03:15:34 GMT

I am working on ENET driver on the M4 core of IMX6 solox board. I met an issue that it of ENET receiving.

1. My ENET driver can send the packet out success. And it triggered interrupt while sending completes.

2. For receiving:

2.a. Most time, there is no receiving interrupt hit. But I can see some data received (not full frame) in the descriptor buffer.

2.b. Some time, it triggers receiving interrupt once. But then it does not trigger receiving interrupt any more. I can still see some data received (not full frame) in the next descriptor buffer.

2.c. On both 2.a and 2.b, The bit ENETx_EIR.RXB is set (Indicates a receive buffer descriptor is not the last in the frame has been updated).

Does any one meet such issue?

Thanks.

Re: Ethernet receiving with M4 core

igorpadykov — Thu, 19 Sep 2019 05:19:21 GMT

Hi Xingsheng

for i.MX6SX fec OS-less example one can look at uboot fec driver

fec_mxc.c\net\drivers - uboot-imx - i.MX U-Boot

also may be useful On-Board Diagnostic Suit for the i.MX28

Best regards
igor
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Re: Ethernet receiving with M4 core

xingshengwan — Thu, 03 Oct 2019 17:45:12 GMT

Hi Igor,

We have used this same driver on i.MX6UL(L), Kinetis, Vybrid, and ColdFire, and they do not have this problem. What changed on the i.MX6 SoloX that would cause this?

I also tried to enable loopback. The receive can only receive 16 bytes data, but the length it shows 0x600 byte.

Xingsheng